PChess 0.9
I want pchess 0.9-- http://mail.python.org/mailman/listinfo/python-list
Re: CGI python use under a curse
On May 7, 2:30 pm, Steven D'Aprano [EMAIL PROTECTED] wrote: On Sun, 06 May 2007 21:30:16 -0700, Adrian Smith wrote: It is NOT the same error. There are NO syntax errors in the script, there is a runtime error. The so-called administrator is wrong: you can't use Perl to test just any old CGI scripts. They have to be written in Perl. Well, I thought that, but you know what happens to newbies who come out with such opinions forcefully. Maybe they have special magic perl which parses python. I see from the source code on your page that you have a line: TEXTAREA NAME=essay COLS=60 ROWS=20 WRAP=HARD/TEXTAREA You have two lines in your cgi script: form = cgi.FieldStorage() print form[essay].value Having never done cgi programming, I'm not sure what the problem is, but after reading help(cgi) I'll take a stab in the dark and say try this: print form.value It might also help for you to try this: print form.keys() Both give me the same ISE, alas. Good luck with the admins at your hosting company. Well, it *is* free, and there aren't that many free ones that offer Python. My paid-for host has sent me a message to say they're ruminating on my issues, though, so I live in hope. -- http://mail.python.org/mailman/listinfo/python-list
Re: Help creating Tiger hash function in Python
I am a Uni student and for a project in Information Systems Security due in just under two weeks, I have tried to make a Python version of the Biham / Anderson Tiger Hash function. I have put the original C source and my two files Tiger.py and doHash.py on my website: http://www.users.on.net/~mlivingstone/ My problems are doubtless basic since I have been teaching myself Python. My best knowledge is Java :-( Firstly, in doHash.py, I cannot invoke tiger() without getting unbounded errors and / or complaints about no such method. First of all you should create an instance of you Tiger class, you try to do this by line: x = Tiger.Tiger But this is wrong, because you should call constructor and pass all necessary parameters, in very simple case: x = Tiger.Tiger() (if there is no constructor parameters) -- Vyacheslav Maslov SWsoft, Inc. -- http://mail.python.org/mailman/listinfo/python-list
PChess 0.9
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Re: Problem to Download ftp file
Perhaps a problem with name resolution ?
On Mo, 7.05.2007, 07:27, Shakil Ahmed wrote:
hi
Actually i need to know that how can i download a ftp file from ncbi by
using python module ftputil.
please help me.
Thanks
regards,
Shakil
import ftputil
host = ftputil.FTPHost('ftp.ncbi.nih.gov/repository/OMIM/morbidmap',
'anonymous', 'password')
The Error message is:
raise FTPOSError(ftp_error)
FTPOSError: (11001, 'getaddrinfo failed')
Debugging info: ftputil 2.2.2, Python 2.4.3 (win32)
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Re: default test method name in unittest framework
En Sun, 06 May 2007 22:17:44 -0300, Vyacheslav Maslov [EMAIL PROTECTED] escribió: i have question related to python's unit testing framework. Take a look at unittest.TestCase class. The main method which contains all code related to test case execution have name run. But in the same time constructor of unittest.TestCase class have param methodName with default value runTest, not run! Why? This leads to AttributeError exception if i do not explicitly set methodName to run during TestCase initialization. No: method run is used by the framework, it internally calls the setUp, tearDown, etc. You don't have to override run (you must not override run!), instead, you provide the runTest method in your class. Furthermore, instead of many similar TestCase classes, you can write a single class with many methods named testXXX, and they will be found and used by a TestLoader. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: problem with quoted strings while inserting into varchar field of database.
On 6 May 2007 11:22:52 -0700, Daniele Varrazzo [EMAIL PROTECTED] Every serious database driver has a complete and solid SQL escaping mechanism. This mechanism tipically involves putting placeholders in your SQL strings and passing python data in a separate tuple or dictionary. Kinda cur.execute(INSERT INTO datatable (data) VALUES (%s);, (pickled_data,)) I will try doing that once I get back to the lab. mean while I forgot to mention in my previous email that I use MySQLdb for python-mysql connection. I did not find any such reference to storing pickled objects in the API. any Idea what could be done with the mysql python module I am using? regards, Krishnakant. -- http://mail.python.org/mailman/listinfo/python-list
N00b question on Py modules
Hi. Sorry to sound like a noob but that's what I am when it comes to Python. I just wrote the below module and it behaves funny. My python module: _exitcode = 0 def setExitCode(): _exitcode = 1 if __name__ == '__main__': print _exitcode setExitCode() print _exitcode Actual O/P: 0 0 I expected to see an output of 0 followed by 1. But it turns out that the _exitcode variable is not changed at all. It seems that setExitCode() might be editing a local copy of the _exitcode variable. But then, how do I tell it to change the value of the module variable and not its local variable. I've been through the modules section of Python docs and a few ebooks as well, all suggest that it shouldn't be working this way. Please help out ppl. Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: DiffLib Question
En Mon, 07 May 2007 00:52:18 -0300, whitewave [EMAIL PROTECTED] escribió:
I am currently doing the third option. Doing file.read() to both file
to be compared then feed the result to the compare function.
Let me give you a brief sample of what I want to achieve.
Using this code
diffline=[]
fileDiff = difflib.Differ().compare(f1, f2)
diffline = list(fileDiff)
finStr = ''.join(diffline)
So you are concerned with character differences, ignoring higher order
structures. Use a linejunk filter function to the Differ constructor -as
shown in my post last Wednesday- to ignore \n characters when matching.
That is:
def ignore_eol(c): return c in \r\n
fileDiff = difflib.Differ(linejunk=ignore_eol).compare(f1, f2)
print ''.join(fileDiff)
you get:
-T h e s o l v a b+ i l- e+ i+ t+ y c o n d i t
i o
n s a n d t h e G r e e n ' s f u n c t i
o n
s o f l i n e a r b o u n d a r y v a l
u e-
+p r o b l e m s f o r o r d i n a r y- +
d i f f e r e n t i a l e q u a t i o n s w
i t
h s u f f i c i e n t l y s m o o t h c o e
f f
i c i e n t s h a v e b e e n-
+i n v e s t i g a t e d i n d e t a i l
b y
+ m+ a+ n+ y+
- o- t- h- e- r-a u t h o r s \ c i t e { C R 1 ,
C R
2 , C R 3 , C R 4 , C R 5 } .
--
Gabriel Genellina
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Re: N00b question on Py modules
On Mon, May 07, 2007 at 12:00:38AM -0700, [EMAIL PROTECTED] wrote: Hi. Sorry to sound like a noob but that's what I am when it comes to Python. I just wrote the below module and it behaves funny. My python module: _exitcode = 0 def setExitCode(): _exitcode = 1 if __name__ == '__main__': print _exitcode setExitCode() print _exitcode Actual O/P: 0 0 I expected to see an output of 0 followed by 1. But it turns out that the _exitcode variable is not changed at all. It seems that setExitCode() might be editing a local copy of the _exitcode variable. But then, how do I tell it to change the value of the module variable and not its local variable. _exitcode is a global variable in your program. In functions (def) you can read global variables. But if you change or reassign them the change will be only local to the function. If you want to change the global variable your def needs to be: def setExitCode(): global _exitcode _exitcode = 1 Kindly Christoph -- http://mail.python.org/mailman/listinfo/python-list
Re: N00b question on Py modules
Hi this variable is local to function do this def setExitCode(): global _exitcode _exitcode = 1 On 7 May 2007 00:00:38 -0700, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Hi. Sorry to sound like a noob but that's what I am when it comes to Python. I just wrote the below module and it behaves funny. My python module: _exitcode = 0 def setExitCode(): _exitcode = 1 this variable is local to function if __name__ == '__main__': print _exitcode setExitCode() print _exitcode Actual O/P: 0 0 I expected to see an output of 0 followed by 1. But it turns out that the _exitcode variable is not changed at all. It seems that setExitCode() might be editing a local copy of the _exitcode variable. But then, how do I tell it to change the value of the module variable and not its local variable. I've been through the modules section of Python docs and a few ebooks as well, all suggest that it shouldn't be working this way. Please help out ppl. Thanks -- http://mail.python.org/mailman/listinfo/python-list -- Regards-- Rishi Pathak National PARAM Supercomputing Facility Center for Development of Advanced Computing(C-DAC) Pune University Campus,Ganesh Khind Road Pune-Maharastra -- http://mail.python.org/mailman/listinfo/python-list
Re: N00b question on Py modules
In [EMAIL PROTECTED], lokesh.jagasia wrote: My python module: _exitcode = 0 def setExitCode(): _exitcode = 1 if __name__ == '__main__': print _exitcode setExitCode() print _exitcode Actual O/P: 0 0 I expected to see an output of 0 followed by 1. But it turns out that the _exitcode variable is not changed at all. It seems that setExitCode() might be editing a local copy of the _exitcode variable. But then, how do I tell it to change the value of the module variable and not its local variable. Any name that gets bound to an object within a function is local to that function unless you declare it as ``global``. But using lots of global variables is considered bad style so you may think about rewriting functions with ``global`` names to return the value(s) instead: _exitcode = 0 def set_exitcode(): return 1 if __name__ == '__main__': print _exitcode _exitcode = set_exitcode() print _exitcode Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie prob: How to write a file with 3 threads?
On May 7, 5:12 am, MRAB [EMAIL PROTECTED] wrote: On May 6, 9:51 am, Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote: In [EMAIL PROTECTED], est wrote: I need to write a file using 3 threads simutaniously, e.g. Thread 1 write the first byte of test.bin with an a, second thread write the second byte b, third thread write the third byte c. Anyone could give a little example on how to do that? Simplest solution is: don't do that. Write from one thread and send the date from the other threads via a `Queue.Queue` to the writing thread. Send the number of the thread with the data so the writer thread knows in which order the data has to be written. [snip] Or have a `Queue.Queue` for each source thread and make the writer thread read from each in turn. I'll try Queue.Queue, thank you. I didn't expect that multithread write a file is so troublesome -- http://mail.python.org/mailman/listinfo/python-list
Re: N00b question on Py modules
[EMAIL PROTECTED] wrote: Hi. Sorry to sound like a noob but that's what I am when it comes to Python. I just wrote the below module and it behaves funny. My python module: _exitcode = 0 def setExitCode(): _exitcode = 1 if __name__ == '__main__': print _exitcode setExitCode() print _exitcode Actual O/P: 0 0 I expected to see an output of 0 followed by 1. But it turns out that the _exitcode variable is not changed at all. It seems that setExitCode() might be editing a local copy of the _exitcode variable. But then, how do I tell it to change the value of the module variable and not its local variable. I've been through the modules section of Python docs and a few ebooks as well, all suggest that it shouldn't be working this way. Please help out ppl. It's a scoping problem. The line _exitcode = 0 creates a (module level) global object. But in def setExitCode(): _exitcode = 1 you are running into Python's default presumption that variables assigned to in a function are *local* to that function. And like all local variables, they can be set and used within the function, but are independent of objects outside the function. If you want to assign to a global object from within a function, then you must explicitly say so: def setExitCode(): global _exitcode _exitcode = 1 See: http://docs.python.org/ref/global.html Gary Herron Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: c macros in python.
On 2007-05-06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
Hey,
I'm writing a script to generate code. I'm a bit tired of typing
outfile.write(). Does python have a way to c-like macros? Every
instance of o(...) in the code will be replaced by outfile.write(...)?
Just in case you don't know, you can write an arbitrary number of lines in one
write. Below is how I format a usage() message of a program in one write call:
def usage(fp):
fp.write(Usage: convert options [infile] [outfile]\n
with\n
options\n
\t--prefix=name-prefix\t(obligatory)\n
\t--write-size\t\tWrite a line containing the size\n
\t--append-zero\t\tAppend a terminating 0 byte\n)
ie one multi-line write call. Pyhon concatenates two consequtive string
literals for us. Unfortunately, this gets less pretty when inserting variable
values.
In other code generation code, I normally use a list of lines. Rather than
writing everything directly to file, I make a list data structure containing
lines, then dump the list to file, as in:
lines = []
gencode_first(lines)
gencode_second(lines)
lines.append(the end)
write_lines(lines)
where write_lines() is
def write_lines(lines):
for line in lines:
outfile.write(line)
outfile.write('\n')
(i left out the opening and closing of outfile).
I normally do not include the \n in the list but instead add it while writing
it to file. This makes life much easier since there are no special last-value
problems in the code generator itself.
The nice thing here is that 'lines' is a normal data structure which you can
manipulate if you like.
For more demanding code generators (ie C or C++ code) I use the concept
'sections'. At a global level, the generated code has an 'include',
'declarations', 'definitions', and 'main' section, each section is a list of
lines.
I use a dictionary for this, like
output = { 'incl': [], 'decl': [], 'def': [], 'main': [] }
then pass around this in the code generator.
Each part of the generator can write in each section, for example when defining
a C function, you can write the declaration in the decl section and the
definition in the def section at the same time.
For example
def write_c_function(output):
output['decl'].append('int mycfunc(void);')
output['def'].extend(['int myfunc(void)', '{' 'return 131;', }' ])
Reducing such a dictionary to a list is then something like
def make_lines(sec_list, output):
lines = []
for sec in sec_list:
lines.extend(output[sec])
return lines
And outputting the code is then something like
write_lines(make_lines(['incl', 'decl', 'def', 'main'], output))
In this way you can abstract away from the order of code as required by the
target language and instead generate code in a nicer order.
Note that this section trick can be done recursively. for example, a function
can be thought of as a number of sections like
funcoutput = { 'header': [], 'opening-bracket' : [], 'localvars':[],
'closing-bracket': [] }
so you can generate a function using sections as well, then at the end reduce
funcoutput to a list of lines, and insert that in a section of the global
'output'.
Last but not least, if you replace the lists by an object, you can do much
smarter things. For example, in general you don't want to have double #include
lines in the 'incl' section. Instead of worrying about generation of doubles,
just make an object that behaves like a list but silently drops doubles.
In the same way, you can create a list-like object that handles indenting for
you.
The possibilities here are endless!!
Good luck with your code generation problem, I hope I gave you some ideas of
alternative solutions that are available.
Albert
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Re: Examples / Links needed
In [EMAIL PROTECTED], Andy wrote: Gurus, I'm looking for definite examples (pardon me if I'm not clear here) on Stack class...Somewhat like this : class Stack(object): def __init__(self__) self.__contents = [] I don't know what to tell you here without writing the thing for you. Ask yourself what operations a `Stack` needs and look at the documentation for `list` operations. It's pretty easy to map the stack operations to `list` ones. and ad hoc implementation of a class based on number system like for example somewhat like this def __imult__(self, other): self.__numerator *= other.__numerator self.__denominator *= other.__denominator . . return self So what exactly is your problem? Take a number like, look at the methods it implements and do this for your number like class. I'm not satisfied with Python Docs. Why? What does `Emulating numeric types`_ in the reference manual lack in your opinion? .. _Emulating numeric types: http://docs.python.org/ref/numeric-types.html Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: N00b question on Py modules
On Mon, 07 May 2007 00:00:38 -0700, lokesh.jagasia wrote: I expected to see an output of 0 followed by 1. But it turns out that the _exitcode variable is not changed at all. It seems that setExitCode() might be editing a local copy of the _exitcode variable. Yes, that's exactly what is happening. But then, how do I tell it to change the value of the module variable and not its local variable. (1) Don't do that. (2) If you think you really need to do it, you don't. (3) If you REALLY need to do it, use the statement: global variable name in your function. Over-use of global variables is one of the sins of programming. Some people might even say that using ANY global variables is a sin. I'm not that strict, but I encourage you to avoid global variables if you can. See here for more details: http://en.wikipedia.org/wiki/Global_variable -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie prob: How to write a file with 3 threads?
est wrote: On May 7, 5:12 am, MRAB [EMAIL PROTECTED] wrote: On May 6, 9:51 am, Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote: In [EMAIL PROTECTED], est wrote: I need to write a file using 3 threads simutaniously, e.g. Thread 1 write the first byte of test.bin with an a, second thread write the second byte b, third thread write the third byte c. Anyone could give a little example on how to do that? Simplest solution is: don't do that. Write from one thread and send the date from the other threads via a `Queue.Queue` to the writing thread. Send the number of the thread with the data so the writer thread knows in which order the data has to be written. [snip] Or have a `Queue.Queue` for each source thread and make the writer thread read from each in turn. I'll try Queue.Queue, thank you. I didn't expect that multithread write a file is so troublesome As a general rule, *ALL* multithread operations are at least that troublesome, and most are far more so. Pessimistically-yours, Gary Herron -- http://mail.python.org/mailman/listinfo/python-list
Re: invoke user's standard mail client
En Mon, 07 May 2007 01:52:18 -0300, [EMAIL PROTECTED] [EMAIL PROTECTED] escribió: On May 6, 9:50 am, Gabriel Genellina [EMAIL PROTECTED] wrote: On Windows you can use MAPI. But how? I could not find any starting point. Get the pywin32 package (Python for Windows extensions) from sourceforge, install it, and look into the win32comext\mapi\demos directory. I found examples about sending mail directly, which gives me the impression that MAPI is just Microsoft's version of SMTP. This is not what I need. I need the user's client to start, so that the user may edit the message and decide herself whether she clicks on the Send button to really send it. No, it should launch the email client (Outlook Express by example) and let the user confirm it. I think there were some flags to suppress the GUI or the confirmation, but they're not honored anymore, I presume. At least Eudora warns the user on such attempts. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
long lists
Hi All, Firstly - thank you Sean for the help and the guideline to get the size comparison, I will definitely look into this. At the moment I actually have 2 bigger issues that needs sorting... 1. I have the script popping all the files that need to be checked into a list, and have it parsing the list for everything...Now the problem is this : The sever needs to check (at the moment) 375 files and eliminate those that don't need reuploading. This number will obviously get bigger and bigger as more files gets uploaded. Now, the problem that I'm having is that the script is taking forever to parse the list and give the final result. How can I speed this up? 2. This issue is actually because of the first one. While the script is parsing the lists and files, the connection to the ftp server times out, and I honestly must say that is is quite annoying. I know I can set the function to reconnect if it cannot find a connection, but wouldn't it just be easier just to keep the connection alive? Any idea how I can keep the connection alive? Thanks for all the help folks, I really appreciate it! -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem to Download ftp file
En Mon, 07 May 2007 02:27:59 -0300, Shakil Ahmed
[EMAIL PROTECTED] escribió:
Actually i need to know that how can i download a ftp file from ncbi by
using python module ftputil.
import ftputil
host = ftputil.FTPHost('ftp.ncbi.nih.gov/repository/OMIM/morbidmap',
'anonymous', 'password')
The host is the first part, ftp.ncbi.nih.gov. The remaining parts are
a directory and a filename. You should write:
host = ftputil.FTPHost('ftp.ncbi.nih.gov','anonymous', 'password')
host.chdir('repository/OMIM')
host.download('morbidmap','path/to/local/file/morbidmap','b')
See the ftputil documentation for more info.
--
Gabriel Genellina
--
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Re: default test method name in unittest framework
Yes, i general you are right. I meant following case, please look at my example Suppose i have following simple test case: import unittest class SomeTest(unittest.TestCase): def testAdd(self): self.assertEqual(2+2,4) if __name__==__main__: unittest.TextTestRunner().run(SomeTest()) this code produce following exception: ValueError: no such test method in class '__main__.SomeTest': runTest Because default test method name is run, but TestCase class have constructor parameter testMethod with default value runTest not run! As result i always should explicitly pass testMethod name when create object of test case class: unittest.TextTestRunner().run(SomeTest(run)) Why i should do this? 2007/5/7, Gabriel Genellina [EMAIL PROTECTED]: En Sun, 06 May 2007 22:17:44 -0300, Vyacheslav Maslov [EMAIL PROTECTED] escribió: i have question related to python's unit testing framework. Take a look at unittest.TestCase class. The main method which contains all code related to test case execution have name run. But in the same time constructor of unittest.TestCase class have param methodName with default value runTest, not run! Why? This leads to AttributeError exception if i do not explicitly set methodName to run during TestCase initialization. No: method run is used by the framework, it internally calls the setUp, tearDown, etc. You don't have to override run (you must not override run!), instead, you provide the runTest method in your class. Furthermore, instead of many similar TestCase classes, you can write a single class with many methods named testXXX, and they will be found and used by a TestLoader. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: PChess 0.9
majeed rana said unto the world upon 05/07/2007 01:13 AM: I want pchess 0.9 I want a mansion and a yacht. Unlike you, google can't help me. http://www.google.ca/search?q=PCHess Brian vdB -- http://mail.python.org/mailman/listinfo/python-list
Re: default test method name in unittest framework
En Mon, 07 May 2007 04:49:12 -0300, Vyacheslav Maslov [EMAIL PROTECTED] escribió: Yes, i general you are right. I meant following case, please look at my example Suppose i have following simple test case: import unittest class SomeTest(unittest.TestCase): def testAdd(self): self.assertEqual(2+2,4) if __name__==__main__: unittest.TextTestRunner().run(SomeTest()) this code produce following exception: ValueError: no such test method in class '__main__.SomeTest': runTest Because default test method name is run, but TestCase class have constructor parameter testMethod with default value runTest not run! NO! the default test method name is not run but runTest, as explained in my previous post. You can either rename the testAdd method to runTest, or change the last line to be, simply: if __name__==__main__: unittest.main() main() will create a TestRunner, a TestLoader, a TestSuite containing all your TestCases, and run them. As result i always should explicitly pass testMethod name when create object of test case class: unittest.TextTestRunner().run(SomeTest(run)) Why i should do this? You should *not* do that! Your tests will not even be run that way. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: msbin to ieee
On 7 mai, 03:52, John Machin [EMAIL PROTECTED] wrote: On May 7, 7:44 am, revuesbio [EMAIL PROTECTED] wrote: Hi Does anyone have the python version of the conversion from msbin to ieee? Thank u Yes, Google has it. Google is your friend. Ask Google. It will lead you to such as: http://mail.python.org/pipermail/python-list/2005-August/337817.html HTH, John Thank you, I've already read it but the problem is always present. this script is for double precision MBF format ( 8 bytes). I try to adapt this script for single precision MBF format ( 4 bytes) but i don't find the right float value. for example : 'P\xad\x02\x95' will return '0.00024924660101532936' -- http://mail.python.org/mailman/listinfo/python-list
Re: long lists
On Mon, 07 May 2007 00:28:14 -0700, Merrigan wrote: 1. I have the script popping all the files that need to be checked into a list, and have it parsing the list for everything...Now the problem is this : The sever needs to check (at the moment) 375 files and eliminate those that don't need reuploading. This number will obviously get bigger and bigger as more files gets uploaded. Now, the problem that I'm having is that the script is taking forever to parse the list and give the final result. How can I speed this up? By writing faster code??? It's really hard to answer this without more information. In particular: - what's the format of the list and how do you parse it? - how does the script decide what files need uploading? -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
Re: problem with quoted strings while inserting into varchar field of database.
On 7 Mag, 08:55, krishnakant Mane [EMAIL PROTECTED] wrote: On 6 May 2007 11:22:52 -0700, Daniele Varrazzo [EMAIL PROTECTED] Every serious database driver has a complete and solid SQL escaping mechanism. This mechanism tipically involves putting placeholders in your SQL strings and passing python data in a separate tuple or dictionary. Kinda cur.execute(INSERT INTO datatable (data) VALUES (%s);, (pickled_data,)) I will try doing that once I get back to the lab. mean while I forgot to mention in my previous email that I use MySQLdb for python-mysql connection. OK: MySQLdb implements the escaping mechanism i described. You can find the documentation if you look for it harder. I did not find any such reference to storing pickled objects in the API. Storing pickled object is not different from storing anything else into BLOB. You would have faced the same problem if you had to write O'Reilly in a VARCHAR field. -- Daniele -- http://mail.python.org/mailman/listinfo/python-list
Re: problem with quoted strings while inserting into varchar field of database.
On Mo, 7.05.2007, 10:30, Daniele Varrazzo wrote: On 7 Mag, 08:55, krishnakant Mane [EMAIL PROTECTED] wrote: On 6 May 2007 11:22:52 -0700, Daniele Varrazzo [EMAIL PROTECTED] Every serious database driver has a complete and solid SQL escaping mechanism. This mechanism tipically involves putting placeholders in your SQL strings and passing python data in a separate tuple or dictionary. Kinda cur.execute(INSERT INTO datatable (data) VALUES (%s);, (pickled_data,)) I will try doing that once I get back to the lab. mean while I forgot to mention in my previous email that I use MySQLdb for python-mysql connection. OK: MySQLdb implements the escaping mechanism i described. You can find the documentation if you look for it harder. I did not find any such reference to storing pickled objects in the API. Storing pickled object is not different from storing anything else into BLOB. You would have faced the same problem if you had to write O'Reilly in a VARCHAR field. -- Daniele -- http://mail.python.org/mailman/listinfo/python-list Why not use qmark parameter passing (PEP 249) ? cur.execute(INSERT INTO datatable (data) VALUES (?); , (pickled_data,)) Then the DB driver will take care for you. -- http://mail.python.org/mailman/listinfo/python-list
Properties on old-style classes actually work?
Hello, The python library docs read in section 2.1 (http://docs.python.org/lib/built-in-funcs.html): ... property( [fget[, fset[, fdel[, doc) Return a property attribute for new-style classes (classes that derive from object). ... But in 2.4 at least properties also seem to work for old-style classes: class O: def __init__(self): self._x = 15 def get_x(self): return self._x x = property(get_x) o = O() print o.x outputs 15 as expected for the property. Regards, Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Properties on old-style classes actually work?
On Mon, 07 May 2007 10:44:35 +0200, Paul Melis wrote:
Hello,
The python library docs read in section 2.1
(http://docs.python.org/lib/built-in-funcs.html):
...
property( [fget[, fset[, fdel[, doc)
Return a property attribute for new-style classes (classes that
derive from object).
...
But in 2.4 at least properties also seem to work for old-style classes:
Unfortunately, they don't -- they seem to work until you try assigning to
them. Here's the same property implemented with a new-style and old-style
class:
class New(object):
def __init__(self, s):
self._value = s
def upgetter(self):
return self._value.upper()
def upsetter(self, s):
self._value = s
value = property(upgetter, upsetter)
class Old:
def __init__(self, s):
self._value = s
def upgetter(self):
return self._value.upper()
def upsetter(self, s):
self._value = s
value = property(upgetter, upsetter)
Properties work with new-style classes:
obj = New('norwegian blue')
obj.value
'NORWEGIAN BLUE'
obj.value = 'nobody expects the spanish inquisition!'
obj.value
'NOBODY EXPECTS THE SPANISH INQUISITION!'
At first, they seem to work with old-style classes:
obj = Old('norwegian blue')
obj.value
'NORWEGIAN BLUE'
But problems occur once you try assigning to it:
obj.value = 'nobody expects the spanish inquisition!'
obj.value
'nobody expects the spanish inquisition!'
And now it is easy to see why:
obj.__dict__['value']
'nobody expects the spanish inquisition!'
obj.__dict__['_value']
'norwegian blue'
The call to assign obj.value over-rides the property with the raw value,
and from that moment on, obj.value is no longer a property, but just an
ordinary instance attribute.
--
Steven.
--
http://mail.python.org/mailman/listinfo/python-list
Re: invoke user's standard mail client
On 4 Mai, 18:54, [EMAIL PROTECTED] (Cameron Laird) wrote: . Portland URL:http://ct.enews.eweek.com/rd/cts?d=186-6281-53-799-798304-697089-0-0-0-1 is the best standardization of this problem we have under Linux. I'll address Windows in a subsequent follow-up. Portland [1] provides scripts (xdg-open, xdg-email...) which overlap with the functionality provided by the desktop module: http://www.python.org/pypi/desktop The desktop module should even work with Windows as well, but it seems that xdg-email has the edge in terms of providing the inquirer's desired support for composing e-mail messages (on Free Software desktops, anyway). Paul [1] http://portland.freedesktop.org/wiki/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Properties on old-style classes actually work?
On May 7, 4:44 am, Paul Melis [EMAIL PROTECTED] wrote: Hello, The python library docs read in section 2.1 (http://docs.python.org/lib/built-in-funcs.html): ... property( [fget[, fset[, fdel[, doc) Return a property attribute for new-style classes (classes that derive from object). ... But in 2.4 at least properties also seem to work for old-style classes: class O: def __init__(self): self._x = 15 def get_x(self): return self._x x = property(get_x) o = O() print o.x outputs 15 as expected for the property. Regards, Paul Paul, Sorry to dissapoint, but properties don't work in old style classes. The 'get' property seems to work but as soon as you use the set property it fails and even 'get' won't work after that. It surely is deceiving, I wish it would just give an error or something. See below. -Nick Vatamaniuc class O: : def __init__(self): : self._x=15 : def get_x(self): : print in O.get_x() : return self._x : def set_x(self,newx): : print in O.set_x(newx) : self._x=newx : x=property(get_x, set_x) : o=O() o._x 15 o.x in O.get_x() in O.get_x() 15 o.x=42 #DANGER WILL ROBINSON, set_x NOT CALLED!!! o.x 42 #HMM... properties ARE BROKEN FROM NOW ON o._x 15 #...BROKEN INDEED -- http://mail.python.org/mailman/listinfo/python-list
Re: problem with quoted strings while inserting into varchar field of database.
On 7 Mag, 10:46, Stefan Sonnenberg-Carstens [EMAIL PROTECTED] wrote: On Mo, 7.05.2007, 10:30, Daniele Varrazzo wrote: On 7 Mag, 08:55, krishnakant Mane [EMAIL PROTECTED] wrote: On 6 May 2007 11:22:52 -0700, Daniele Varrazzo [EMAIL PROTECTED] Every serious database driver has a complete and solid SQL escaping mechanism. This mechanism tipically involves putting placeholders in your SQL strings and passing python data in a separate tuple or dictionary. Kinda cur.execute(INSERT INTO datatable (data) VALUES (%s);, (pickled_data,)) I will try doing that once I get back to the lab. mean while I forgot to mention in my previous email that I use MySQLdb for python-mysql connection. Why not use qmark parameter passing (PEP 249) ? cur.execute(INSERT INTO datatable (data) VALUES (?); , (pickled_data,)) Then the DB driver will take care for you. import MySQLdb print MySQLdb.paramstyle format MySQLdb (as many other drivers) use format parameter passing. Not much difference w.r.t. qmark, at least when passing positional parameters: the placeholder is %s instead of ?. A difference is that format also allows named parameters (actually it should have been pyformat, but IIRC MySQLdb can also use named placeholders, even if they advertise format). Anyway it is only a matter of placeholder style: they both allow the driver to take care of data escaping, the concept the OT didn't know about. -- Daniele -- http://mail.python.org/mailman/listinfo/python-list
Re: High resolution sleep (Linux)
Tim Roberts [EMAIL PROTECTED] wrote Consider what you're asking here. The operating system can only age the timer list and re-evaluate process ready states when a process goes into kernel mode, either by releasing the CPU or hitting the end of its time slice. In order to know that a process has reached the end of its time slice, it has to be interrupted by something, typically the timer interrupt. Yes In order to provide 10us sleep resolution, the timer interrupt would have to fire every 10us. Not necessarily. see below The overhead of handling the timer interrupt and rescheduling that often is quite significant. Yes It is also possible to keep the timer list sorted by expiry date, and to reprogram the timer to interrupt at the next expiry time to give arbitrary resolution, instead of implementing a regular 'tick'. But this also adds overhead and its a PITA to do efficiently, using a linked list of next interrupt time. So its not normally done unless you *really* need it. Its easier to make a free running hardware counter and to read it and do the sums yourself, hogging the processor, if you need such fine resolution. Ten microseconds is not much time - Speed of light is about one foot per nanosecond, so that gives ten thousand feet of travel for a radio wave - less than two miles, or about three kilometres. A rifle bullet can travel at around 5000 feet per second. In ten microseconds it moves six tenths of an inch. A vehicle at 300 Km/h (about 187 MPH) will not move as much as a millimetre in that time. OTOH - if you are trying to make a software radar system to pick up intruders in your back yard, then ten microseconds is a hopelessly long time... - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
matplotlib: howto redraw figure automatically, without stop in show()/draw()?
Hi all, here is a question already mentioned below, and I'm also interested in that one very much. unfortunatly, I can't write anything to matplotlib mailing lists because I constantly get server internal error (500) Does anyone knows the answer? (howto redraw figure automatically (for example update from time to time in cycle), without stop in show()/draw()?) Thx in advance, D. redcic [EMAIL PROTECTED] wrote: I've already got this package. I just wanted to try something new. However, since you talk about it, I've got a question regarding this package. The execution of the code stops after the line: pylab.show() which is off course the last line of my code. My problem is that I have to close the figure window in order to launch my program another time. I'd like to be able to launch my program many times with different parameters without having to close the figure windows before each launch. Just so you know, I'm using TkAgg backend. Any hint ? -- http://mail.python.org/mailman/listinfo/python-list
Custom software development
iTechArt Group - Custom Software Development and Offshore outsourcing Company http://www.itechart.com/ Offshore custom software development company iTechArt - Web site and Content Management Solutions development, CMS consulting: Ektron, Drupal and DotNetNuke iTechArt Group provides high quality custom software development services and offshore software development. On December 2006, iTechArt Group became an authorized Microsoft Certified Partner. This means that our company has been recognized by Microsoft for our vast expertise and authorized to custom software development; provide IT service consulting and custom business solutions. Custom Software Development and Offshore outsourcing Company iTechArt has worked together since 2003 to design build and deliver .NET Web Content Management software solutions that help clients meet their strategic objectives. We are agile oriented development partner able to consistently deliver solid results. iTechArt software development team assemblies specialists in the development of custom software applications and offshore software outsourcing services. Working concepts of our company are based on proven approaches and international standards used for custom software development such as Capability Maturity Model Integration for Software Engineering (CMMI- SW). In the same breath we have our own standpoint on software development process management which is fully effective and comprehensible for our clients. iTechArt offers software development in the next main directions: 1. Custom Software Development (Offshore outsourcing for worldwide based software development companies.) 2. Software Development for Digital Signage (Media content development and remote displays / information kiosks Web-based software application management.) 3. Web Site Development (E-commerce solutions, CMS/DotNetNuke/Ektron/ Drupal, Web 2.0/PHP/MySQL/AJAX, Flash/Action script/Flex and many more.) 4. Offshore Development Center (Dedicated development team of software developers. Our offshore development centers operate as an extension to clients' existing software engineering business.) Contact iTechArt ( http://www.itechart.com/ )about custom software development, end-to-end software solutions, outsourcing software development, custom DotNetNuke module development, DotNetNuke consulting, dotnetnuke hosting, first class Java and .Net developers, software application design, software testing, Quality Assurance, functionality testing and defect analysis, performance and stress testing, usability testing, Microsoft Media Services and Adobe Media Flash Server solutions, digital signage solutions and custom development, Ektron CMS400.NET developers, CMS, .NET Web Content Management software solutions Web: http://www.itechart.com/ http://www.itechart.com/Pages/ProductsServices/HowWeWork.aspx http://www.itechart.com/Pages/ProductsServices/BusinessModels.aspx http://www.itechart.com/Pages/ProductsServices/CustomSoftwareDevelopment.aspx http://www.itechart.com/Pages/ProductsServices/DotNetNukeModuleDevelopment.aspx -- http://mail.python.org/mailman/listinfo/python-list
Bastion/rexec use cases?
Bastion and rexec have been deprecated since Python 2.2, so it seems we (the Python community) have gotten along well enough without them. Have these modules not been reimplemented because: a) There are no valid use cases for them. b) Doing so would be difficult and prone to breakage as new features are introduced into the language. c) Nobody has any idea how to do it. d) Nobody cares. e) Guido thinks it's a bad idea. or, some combination of these? -- http://mail.python.org/mailman/listinfo/python-list
assisging multiple values to a element in dictionary
Hi,
I have a dictionary which is something like this:
id_lookup={
16:'subfunction',
26:'dataId',
34:'parameterId',
39:'subfunction',
44:'dataPackageId',
45:'parameterId',
54:'subfunction',
59:'dataId',
165:'subfunction',
169:'subfunction',
170:'dataPackageId',
174:'controlParameterId'
}
How do i assign multiple values to the key here.Like i want the
key 170 to take either the name 'dataPackageID' or the name
'LocalId'.I use this in my code,and hence if either comes it should
work .
Can someone help me.
Thanks
--
http://mail.python.org/mailman/listinfo/python-list
Re: N00b question on Py modules
Thanks a lot for the responses ppl. Python's treatment of global variables was an eye-opener. I have coded in Java C/C++ in the past and there the behaviour is diametrically opposite. Cheers -- http://mail.python.org/mailman/listinfo/python-list
Re: invoke user's standard mail client
In article [EMAIL PROTECTED], Cameron Laird [EMAIL PROTECTED] wrote: In article [EMAIL PROTECTED], [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Hello, the simplest way to launch the user's standard mail client from a Python program is by creating a mailto: URL and launching the webbrowser: def mailto_url(to=None,subject=None,body=None,cc=None): encodes the content as a mailto link as described on http://www.faqs.org/rfcs/rfc2368.html Examples partly taken from http://selfhtml.teamone.de/html/verweise/email.htm url = mailto:; + urllib.quote(to.strip(),@,) sep = ? if cc: url+= sep + cc= + urllib.quote(cc,@,) sep = if subject: url+= sep + subject= + urllib.quote(subject,) sep = if body: # Also note that line breaks in the body of a message MUST be # encoded with %0D%0A. (RFC 2368) body=\r\n.join(body.splitlines()) url+= sep + body= + urllib.quote(body,) sep = return url import webbrowser url = mailto_url(...) webbrowser.open(url,new=1) (Excerpt from http://svn.berlios.de/wsvn/lino/trunk/src/lino/tools/mail.py?op=filerev=0sc=0) But this method is limited: you cannot specify a file to be attached to the mail. And I guess that there would be problems if the body text is too complex. Does somebody know about a better method? It should be possible at least on Windows, since Acrobat Reader is able to do it. . . . Portland URL: http://ct.enews.eweek.com/rd/cts?d=186-6281-53-799-798304-697089-0-0-0-1 is the best standardization of this problem we have under Linux. I'll address Windows in a subsequent follow-up. A. Apologies! I'm sorry about the URL above; it was completely wrong. I intended URL: http://www-128.ibm.com/developerworks/linux/library/l-portland.html . B. The best approach I know under Windows is to invoke start mailto:$ADDRESS 1. That invocation does *not* communicate subject, attachments, ... To do so adequately involves application-specific work, as other follow-ups have mentioned. 2. start has its own complexities. The best invocation from console-based Python is likely to be start /w mailto:$ADDRESS -- http://mail.python.org/mailman/listinfo/python-list
Re: assisging multiple values to a element in dictionary
On May 7, 7:03 am, [EMAIL PROTECTED] wrote:
Hi,
I have a dictionary which is something like this:
id_lookup={
16:'subfunction',
26:'dataId',
34:'parameterId',
39:'subfunction',
44:'dataPackageId',
45:'parameterId',
54:'subfunction',
59:'dataId',
165:'subfunction',
169:'subfunction',
170:'dataPackageId',
174:'controlParameterId'}
How do i assign multiple values to the key here.Like i want the
key 170 to take either the name 'dataPackageID' or the name
'LocalId'.I use this in my code,and hence if either comes it should
work .
Can someone help me.
Thanks
id_lookup[170]=('dataPackageID', 'LocallId')
-Nick V.
--
http://mail.python.org/mailman/listinfo/python-list
Re: msbin to ieee
On May 7, 6:18 pm, revuesbio [EMAIL PROTECTED] wrote: On 7 mai, 03:52, John Machin [EMAIL PROTECTED] wrote: On May 7, 7:44 am, revuesbio [EMAIL PROTECTED] wrote: Hi Does anyone have the python version of the conversion from msbin to ieee? Thank u Yes, Google has it. Google is your friend. Ask Google. It will lead you to such as: http://mail.python.org/pipermail/python-list/2005-August/337817.html HTH, John Thank you, I've already read it but the problem is always present. this script is for double precision MBF format ( 8 bytes). It would have been somewhat more helpful had you said what you had done so far, even posted your code ... I try to adapt this script for single precision MBF format ( 4 bytes) but i don't find the right float value. for example : 'P\xad\x02\x95' will return '0.00024924660101532936' If you know what the *correct* value is, you might like to consider shifting left by log2(correct_value/erroneous_value) :-) Do you have any known correct pairs of (mbf4 string, decimal_float value)? My attempt is below -- this is based on a couple of descriptive sources that my friend Google found, with no test data. I believe the correct answer for the above input is 1070506.0 i.e. you are out by a factor of 2 ** 32 def mbf4_as_float(s): m0, m1, m2, m3 = [ord(c) for c in s] exponent = m3 if not exponent: return 0.0 sign = m2 0x80 m2 |= 0x80 mant = (((m2 8) | m1) 8) | m0 adj = 24 + 128 num = mant * 2.0 ** (exponent - adj) if sign: return -num return num HTH, John -- http://mail.python.org/mailman/listinfo/python-list
Re: Basic question about sockets and security
Dave Dean wrote: Hi all, I'm just starting out in sockets/network programming, and I have a very basic question...what are the 'security' implications of opening up a socket? For example, suppose I've written a simple chat server and chat client. The server opens a socket, listens on a port, and accepts incoming connections. The clients open a socket and connect to the server. If the server receives a message from a client, it sends that message out to every client. When a client receives a message, it places it in a text widget. So...are there inherent dangers in doing this? I have no real security concern in the actual application, but can an open socket somehow allow someone access to the rest of the computer? Is the 'security' of the socket handled at the OS level (or within the socket module)? I realize this isn't necessarily a Python question, but I wrote my application in Python and I'm not sure where to start. I'll repost this elsewhere if someone points me towards a more relevant group. It's something that all Python network newbies would like to know about (and OUGHT to know about), so it's a valid question. Essentially all opening a server socket does is to allow anyone who can connect to send data to your process. The difficulties usually begin when your process doesn't handle it in a secure way. Typically in a language like C this will involve failing to check its length, thereby allowing a malicious user to send an over-length input and (since local variables in CC are held on the stack) overwriting crucial data like function return addresses. Such exploits can be used to inject code into your process and have it run. Since server processes often run at a high level of privilege, so does the exploit code. Another way you can introduce vulnerabilities into your code is to craft inputs that, when incorporated into system calls, maliciously change the intent of your code. So suppose you had a command to allow a user to ping another computer, you might do (something like) os.system(ping +address) where the address is what the user types in. However, if the user types in something like 192.168.12.13 ; rm /etc/passwd then your call becomes os.system(ping 192.168.12.13; rm /etc/passwd) and executes two shell statements, the second of which is rather destructive. So, as long as you aren't passing any user data to the operating system in any way shape or form you are probably in reasonably good shape. But this is easier to do than you might imagine, and you always need to ask yourself what the downside potential of malicious inputs might be. Python's libraries are well written by and large, and the language itself checks the bounds of all data structure accesses, making buffer overflow exploits of the type I described much less of a risk, but the OS vulnerabilities still remain for you to avoid by careful coding. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden -- Asciimercial - Get on the web: Blog, lens and tag your way to fame!! holdenweb.blogspot.comsquidoo.com/pythonology tagged items: del.icio.us/steve.holden/python All these services currently offer free registration! -- Thank You for Reading -- http://mail.python.org/mailman/listinfo/python-list
Re: assisging multiple values to a element in dictionary
I have a dictionary which is something like this:
id_lookup={
16:'subfunction',
26:'dataId',
34:'parameterId',
39:'subfunction',
44:'dataPackageId',
45:'parameterId',
54:'subfunction',
59:'dataId',
165:'subfunction',
169:'subfunction',
170:'dataPackageId',
174:'controlParameterId'
}
How do i assign multiple values to the key here.Like i want the
key 170 to take either the name 'dataPackageID' or the name
'LocalId'.
In general dictionary define strong relation between keys and values,
key should have only one associated value, but in your case value can be
a tuple or list.
Anyway, i think that your question contradict to dictionary concept,
because is impossilbe to assign for some key multiple values.
--
Vyacheslav Maslov
--
http://mail.python.org/mailman/listinfo/python-list
Re: Basic question about sockets and security
Dave Dean wrote: [socket security inquiry] One further point: everything I wrote for server sockets applies to client sockets too if there's a possibility they are interacting with a server that's been maliciously coded, or compromised in some way by an attacker. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden -- Asciimercial - Get on the web: Blog, lens and tag your way to fame!! holdenweb.blogspot.comsquidoo.com/pythonology tagged items: del.icio.us/steve.holden/python All these services currently offer free registration! -- Thank You for Reading -- http://mail.python.org/mailman/listinfo/python-list
Re: CGI python use under a curse
Adrian Smith wrote: On May 7, 2:30 pm, Steven D'Aprano [EMAIL PROTECTED] wrote: On Sun, 06 May 2007 21:30:16 -0700, Adrian Smith wrote: It is NOT the same error. There are NO syntax errors in the script, there is a runtime error. The so-called administrator is wrong: you can't use Perl to test just any old CGI scripts. They have to be written in Perl. Well, I thought that, but you know what happens to newbies who come out with such opinions forcefully. Maybe they have special magic perl which parses python. I see from the source code on your page that you have a line: TEXTAREA NAME=essay COLS=60 ROWS=20 WRAP=HARD/TEXTAREA You have two lines in your cgi script: form = cgi.FieldStorage() print form[essay].value Having never done cgi programming, I'm not sure what the problem is, but after reading help(cgi) I'll take a stab in the dark and say try this: print form.value It might also help for you to try this: print form.keys() Both give me the same ISE, alas. Good luck with the admins at your hosting company. Well, it *is* free, and there aren't that many free ones that offer Python. My paid-for host has sent me a message to say they're ruminating on my issues, though, so I live in hope. I'd go to Cornerhost. You can get a cheap account there and the support is friendly and knowledgable. I am no longer a customer and do not stand to gain by this recommendation, but they are a small business that were very helpful to me when I *was* a customer. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden -- Asciimercial - Get on the web: Blog, lens and tag your way to fame!! holdenweb.blogspot.comsquidoo.com/pythonology tagged items: del.icio.us/steve.holden/python All these services currently offer free registration! -- Thank You for Reading -- http://mail.python.org/mailman/listinfo/python-list
Re: Bastion/rexec use cases?
Paul Miller wrote: Bastion and rexec have been deprecated since Python 2.2, so it seems we (the Python community) have gotten along well enough without them. Have these modules not been reimplemented because: a) There are no valid use cases for them. b) Doing so would be difficult and prone to breakage as new features are introduced into the language. c) Nobody has any idea how to do it. d) Nobody cares. e) Guido thinks it's a bad idea. or, some combination of these? All of the above except c) and d), I think. You might like to Google for something like Brett Cannon secure Python to get up to speed on some work that may eventually result in Python acquiring a more security-minded framework. Bastion and rexec were so full of holes you could drive a London double-decker bus through them, so their deprecation and eventual exclusion was felt to be safer than leaving them in to be mistaken for secure code. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden -- Asciimercial - Get on the web: Blog, lens and tag your way to fame!! holdenweb.blogspot.comsquidoo.com/pythonology tagged items: del.icio.us/steve.holden/python All these services currently offer free registration! -- Thank You for Reading -- http://mail.python.org/mailman/listinfo/python-list
Re: msbin to ieee
On 7 mai, 13:21, John Machin [EMAIL PROTECTED] wrote:
On May 7, 6:18 pm, revuesbio [EMAIL PROTECTED] wrote:
On 7 mai, 03:52, John Machin [EMAIL PROTECTED] wrote:
On May 7, 7:44 am, revuesbio [EMAIL PROTECTED] wrote:
Hi
Does anyone have the python version of the conversion from msbin to
ieee?
Thank u
Yes, Google has it. Google is your friend. Ask Google. It will lead
you to such as:
http://mail.python.org/pipermail/python-list/2005-August/337817.html
HTH,
John
Thank you,
I've already read it but the problem is always present. this script is
for double precision MBF format ( 8 bytes).
It would have been somewhat more helpful had you said what you had
done so far, even posted your code ...
I try to adapt this script for single precision MBF format ( 4 bytes)
but i don't find the right float value.
for example : 'P\xad\x02\x95' will return '0.00024924660101532936'
If you know what the *correct* value is, you might like to consider
shifting left by log2(correct_value/erroneous_value) :-)
Do you have any known correct pairs of (mbf4 string, decimal_float
value)? My attempt is below -- this is based on a couple of
descriptive sources that my friend Google found, with no test data. I
believe the correct answer for the above input is 1070506.0 i.e. you
are out by a factor of 2 ** 32
def mbf4_as_float(s):
m0, m1, m2, m3 = [ord(c) for c in s]
exponent = m3
if not exponent:
return 0.0
sign = m2 0x80
m2 |= 0x80
mant = (((m2 8) | m1) 8) | m0
adj = 24 + 128
num = mant * 2.0 ** (exponent - adj)
if sign:
return -num
return num
HTH,
John
well done ! it's exactly what i'm waiting for !!
my code was:
from struct import *
x = list(unpack('','P\xad\x02\x95'))
x
[80, 173, 2, 149]
def conversion1(bytes):
b=bytes[:]
sign = bytes[-2] 0x80
b[-2] |= 0x80
exp = bytes[-1] - 0x80 - 56
acc = 0L
for i,byte in enumerate(b[:-1]):
acc |= (long(byte)(i*8))
return (float(acc)*2.0**exp)*((1.,-1.)[sign!=0])
conversion1(x)
0.00024924660101532936
this script come from google groups but i don't understand bit-string
manipulation (I'm a newbie). informations about bit-string
manipulation with python is too poor on the net.
thank you very much for your script.
A.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Bastion/rexec use cases?
Paul Miller [EMAIL PROTECTED] wrote: Bastion and rexec have been deprecated since Python 2.2, so it seems we (the Python community) have gotten along well enough without them. Have these modules not been reimplemented because: a) There are no valid use cases for them. b) Doing so would be difficult and prone to breakage as new features are introduced into the language. c) Nobody has any idea how to do it. d) Nobody cares. e) Guido thinks it's a bad idea. or, some combination of these? I think it is mostly 'b' plus partly nobody cares sufficiently to put the time, money and effort behind it. The recent release of Silverlight means that there is now a way to run Python in a secure sandbox. At present it is only available for Windows and Mac, but hopefully the Mono community will be able to overcome that deficiency (also of course you don't get all of the standard Python libraries): see http://www.mono-project.com/Moonlight for the current state of the Mono based Silverlight implementation. -- http://mail.python.org/mailman/listinfo/python-list
Re: long lists
On May 7, 10:18 am, Steven D'Aprano [EMAIL PROTECTED] wrote: On Mon, 07 May 2007 00:28:14 -0700, Merrigan wrote: 1. I have the script popping all the files that need to be checked into a list, and have it parsing the list for everything...Now the problem is this : The sever needs to check (at the moment) 375 files and eliminate those that don't need reuploading. This number will obviously get bigger and bigger as more files gets uploaded. Now, the problem that I'm having is that the script is taking forever to parse the list and give the final result. How can I speed this up? By writing faster code??? It's really hard to answer this without more information. In particular: - what's the format of the list and how do you parse it? - how does the script decide what files need uploading? -- Steven. Hi, Thanx for the reply, The Script it available at this url : http://www.lewendewoord.co.za/theScript.py P.S. I know it looks like crap, but I'm a n00b, and not yet through the OOP part of the tutorial. Thanx in advance! -- http://mail.python.org/mailman/listinfo/python-list
Re: matplotlib: howto redraw figure automatically, without stop in show()/draw()?
dmitrey wrote: Hi all, here is a question already mentioned below, and I'm also interested in that one very much. unfortunatly, I can't write anything to matplotlib mailing lists because I constantly get server internal error (500) Does anyone knows the answer? maybe this is what you want ? http://matplotlib.sourceforge.net/faq.html#DYNAMIC happy pythoning herbert -- http://mail.python.org/mailman/listinfo/python-list
Re: Bastion/rexec use cases?
On 7 Mai, 14:01, Duncan Booth [EMAIL PROTECTED] wrote: Paul Miller [EMAIL PROTECTED] wrote: Bastion and rexec have been deprecated since Python 2.2, so it seems we (the Python community) have gotten along well enough without them. Have these modules not been reimplemented because: a) There are no valid use cases for them. b) Doing so would be difficult and prone to breakage as new features are introduced into the language. c) Nobody has any idea how to do it. d) Nobody cares. e) Guido thinks it's a bad idea. or, some combination of these? I think it is mostly 'b' plus partly nobody cares sufficiently to put the time, money and effort behind it. I'd agree with this, adding that (c) is increasingly starting to apply to CPython as new features make any potential sandboxing strategy less coherent. Brett Cannon appears to be tackling this situation head-on, however. The recent release of Silverlight means that there is now a way to run Python in a secure sandbox. Also possible with Jython for a long time, I believe. Meanwhile, others (including non-Python developers) have turned to other kinds of solutions including virtualisation at different levels. See this page for more discussion: http://wiki.python.org/moin/SandboxedPython I've experimented somewhat with a chroot-based solution, although I'm reluctant to make it available because of an uncertainty as to whether it really offers proper jailing of the executed code, along with concerns that people may consider it secure without doing their own homework on the matter. Ideally, I'd want to trim the Python interpreter right down to the very basic virtual machine (without I/O) and then build the different extensions back on in a security-oriented framework, but I guess this is what Mr Cannon has in mind. Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Plot with scipy
On 4 Mai, 15:57, redcic [EMAIL PROTECTED] wrote: I've already got this package. I just wanted to try something new. However, since you talk about it, I've got a question regarding this package. The execution of the code stops after the line: pylab.show() which is off course the last line of my code. My problem is that I have to close the figure window in order to launch my program another time. I'd like to be able to launch my program many times with different parameters without having to close the figure windows before each launch. Just so you know, I'm using TkAgg backend. Any hint ? There's an option in your matplotlibrc file (personal lives in $HOME/.matplotlib, default in $PYTHONPATH/matplotlib/mpl-data): CONFIGURATION BEGINS HERE # the default backend; one of GTK GTKAgg GTKCairo FltkAgg QtAgg TkAgg # Agg Cairo GD GDK Paint PS PDF SVG Template backend : TkAgg numerix : numpy # numpy, Numeric or numarray interactive : True # see http://matplotlib.sourceforge.net/interactive.html . Take a look at the quoted webpage for details and troubleshooting. Bernhard -- http://mail.python.org/mailman/listinfo/python-list
Re: assisging multiple values to a element in dictionary
On Mon, 2007-05-07 at 04:03 -0700, [EMAIL PROTECTED] wrote:
Hi,
I have a dictionary which is something like this:
id_lookup={
16:'subfunction',
26:'dataId',
34:'parameterId',
39:'subfunction',
44:'dataPackageId',
45:'parameterId',
54:'subfunction',
59:'dataId',
165:'subfunction',
169:'subfunction',
170:'dataPackageId',
174:'controlParameterId'
}
How do i assign multiple values to the key here.Like i want the
key 170 to take either the name 'dataPackageID' or the name
'LocalId'.I use this in my code,and hence if either comes it should
work .
That sounds to me like you're translating names to numbers. If that is
true, you're much better off turning your dictionary around, making the
name the key and the corresponding number the value. That way you'll
have two keys pointing to the same value, which is perfectly legal,
whereas having one key pointing to two values is not really possible.
You could have one key pointing to a list or tuple of two values, but
it's not obvious whether that would solve your problem.
Hope this helps,
--
Carsten Haese
http://informixdb.sourceforge.net
--
http://mail.python.org/mailman/listinfo/python-list
Re: long lists
In [EMAIL PROTECTED], Merrigan wrote: The Script it available at this url : http://www.lewendewoord.co.za/theScript.py P.S. I know it looks like crap, but I'm a n00b, and not yet through the OOP part of the tutorial. One spot of really horrible runtime is the `comp_are()` function, it has quadratic runtime. Why the funny spelling BTW? Why are you binding the objects to new names all the time and calling `str()` repeatedly on string objects? The names `a`, `b` and `fn2up` are unnecessary, you can use `file1`, `file2` and `filename` instead. And ``str(str(b))`` on a string object is a no-operation. It's the same as simply writing ``b``. Those two nested ``for``-loops can be replaced by converting both lists into `set()` objects, calculating the difference and convert back to a sorted list: def compare(remote, local): return sorted(set(local) - set(remote)) Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: assisging multiple values to a element in dictionary
On May 7, 10:59 pm, Carsten Haese [EMAIL PROTECTED] wrote:
On Mon, 2007-05-07 at 04:03 -0700, [EMAIL PROTECTED] wrote:
Hi,
I have a dictionary which is something like this:
id_lookup={
16:'subfunction',
26:'dataId',
34:'parameterId',
39:'subfunction',
44:'dataPackageId',
45:'parameterId',
54:'subfunction',
59:'dataId',
165:'subfunction',
169:'subfunction',
170:'dataPackageId',
174:'controlParameterId'
}
How do i assign multiple values to the key here.Like i want the
key 170 to take either the name 'dataPackageID' or the name
'LocalId'.I use this in my code,and hence if either comes it should
work .
That sounds to me like you're translating names to numbers. If that is
true, you're much better off turning your dictionary around, making the
name the key and the corresponding number the value. That way you'll
have two keys pointing to the same value, which is perfectly legal,
whereas having one key pointing to two values is not really possible.
You could have one key pointing to a list or tuple of two values, but
it's not obvious whether that would solve your problem.
Hope this helps,
Unlikely. Turning it around produces one key ('subfunction') with
*FIVE* different values.
--
http://mail.python.org/mailman/listinfo/python-list
Re: assisging multiple values to a element in dictionary
On Mon, 2007-05-07 at 06:06 -0700, John Machin wrote:
Unlikely. Turning it around produces one key ('subfunction') with
*FIVE* different values.
Whoops! I assumed the OP's problem was reasonably well-formed and didn't
actually check if any of the values were duplicated. I guess the OP will
just have to live with the suggestion of storing tuples or lists, or
explain to us what he's actually trying to achieve.
--
Carsten Haese
http://informixdb.sourceforge.net
--
http://mail.python.org/mailman/listinfo/python-list
how do you implement a reactor without a select?
I have always been curious about how people implement mainloops (or,
in Twisted terminology, reactors). So I sit down and I wrote the
following simple implementation:
import itertools
class SimpleReactor(object):
DELAY = 0.001 # seconds
def __init__(self):
self._event = {} # action id - (scheduled time, action, args)
self._counter = itertools.count(1) # action id generator
self.running = False
def callLater(self, deltat, action, *args):
Schedule an action with arguments args in deltat seconds.
Return the action id
now = time.time()
i = self._counter.next()
self._event[i] = now + deltat, action, args
return i
def cancelCallLater(self, action_id):
Cancel the action identified by action_id
del self._event[action_id]
def default_action(self): # to be overridden
Invoked at each lap in the mainloop
time.sleep(self.DELAY) # don't run too fast, rest a bit
def cleanup_action(self): # to be overridden
Invoked at the end of the mainloop
def manage_exc(self, e):
Invoked at each call
raise e
def dooneevent(self):
Perfom scheduled actions
now = time.time()
for i, (start_time, action, args) in self._event.items():
if now = start_time: # it's time to start the action
self.cancelCallLater(i) # don't run it again
try:
action(*args)
except Exception, e:
self.manage_exc(e)
def run(self):
Run the main loop
self.running = True
try:
while self.running:
self.default_action()
self.dooneevent()
except KeyboardInterrupt:
print 'Stopped via CTRL-C'
finally:
self.cleanup_action()
def stop(self):
self.running = False
Notice that I copied the Twisted terminology, but
I did not look at Twisted implementation because I did not want to
use a select (I assume that the GUI mainloops do not use it either).
The trick I use is to store the actions to perform (which are
callables identified by an integer) in an event dictionary and
to run them in the mainlooop if the current time is greater than
the scheduled time.
I had to add a time.sleep(.001) call in the default_action to avoid
consuming 100%
of the CPU in the loop.
I wonder if real mainloops are done in this way and how bad/good is
this implementation compared to a serious one. Any suggestion/hint/
advice
is well appreciated. Thanks,
Michele Simionato
--
http://mail.python.org/mailman/listinfo/python-list
Can Python Parse an MS SQL Trace?
Hi All, Can Python parse a trace file created with MS SQL's profiler? There are a few thousand lines in the trace file and I need to find the insert statements and the stored procedures. Unfortunately, I am not an SQL guru and was hoping Python could help. Any pointers are appreciated. Thanks! Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: adding methods at runtime and lambda
On May 4, 5:46 pm, Peter Otten [EMAIL PROTECTED] wrote: Mike wrote: I just realized in working with this more that the issues I was having with instancemethod and other things seems to be tied solely to What you describe below is a function that happens to be an attribute of an instance. There are also real instance methods that know about their instance: import new class A(object): ... def __init__(self, name): ... self.name = name ... def method(self): # a function... ... print self.name ... a = A(alpha) b = A(beta) a.method = new.instancemethod(method, a) # ...turned into a method... a.method() alpha b.method() # ... but only known to a specific instance of A Traceback (most recent call last): File stdin, line 1, in module AttributeError: 'A' object has no attribute 'method' builtins like dict or object. I remember at some point just doing something like: x.fn = myfnFunction and having it just work. With the caveat that x.fn is now an alias for myfnFunction, but doesn't get x passed as its first argument (conventionally named 'self') and therefore has no knowledge of the instance x. If I do that with an instance of generic object however, I get an AttributeError. So: x = object() x.fn = myFn blows up. However, if I do class nc(object):pass x = nc() x.fn = myFn Then all is well. checking for an ability on somebody is as simple as 'fn' in dir(x) or hasattr(x, 'fn') I had thought this was a lot easier than I was making it out to be. What I don't know is why using an object derived from object allows you to dynamically add methods like this but the base object does not. At this point it is more of a curiosity than anything, but if somebody knows the answer off the top of their head, that would be great. Arbitrary instance attributes are implemented via a dictionary (called __dict__), and that incurs a certain overhead which is sometimes better to avoid (think gazillion instances of some tiny class). For example, tuples are derived from object but don't have a __dict__. As a special case, what would happen if dict were to allow attributes? It would need a __dict__ which would have a __dict__ which would have... As a consequence object could no longer be the base class of all (newstyle) classes. Peter Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: Can Python Parse an MS SQL Trace?
[EMAIL PROTECTED] wrote: Can Python parse a trace file created with MS SQL's profiler? There are a few thousand lines in the trace file and I need to find the insert statements and the stored procedures. Unfortunately, I am not an SQL guru and was hoping Python could help. Mike Mike, Can I suggest that, since the answer is more to do with parsing and less to do with MSSQL (which simply generated the output) that you post an example of a trace file to some web location to see if anyone wants to pick up the challenge? I'm not at work so I don't have access to MSSQL, but I seem to remember that you can output/save as XML, which may make things easier (or at least interest a different group of people in having a look). I'm quite certain it can by done by Python; I did consider it myself a couple of months back, but my colleague spotted the problem before I'd really got into the code! TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: How do I use the config parser?
[EMAIL PROTECTED] wrote:
Hi,
I need a specific example. I have seen the docs, but I don't all the
stuffs there.
So basically, I need my config file to be created and read by my
script.
Here is a snippet
# read old actions
from ConfigParser import ConfigParser
fp = open(makepath('App\qt_actions.conf'))
configdict = ConfigParser()
configdict.readfp(fp)
Now I want to know how to read a section, a section attribute's value,
and to write thoses back after reading.
Thanks
The best place to start is always:
import ConfigParser
help(ConfigParser)
Example:
section='INIT'
option='logfile'
logfile=configdict.get(section, option)
most of the methods are self explanitory.
-Larry
--
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Re: msbin to ieee
On 7 mai, 14:56, John Machin [EMAIL PROTECTED] wrote:
On May 7, 10:00 pm, revuesbio [EMAIL PROTECTED] wrote:
On 7 mai, 13:21, John Machin [EMAIL PROTECTED] wrote:
On May 7, 6:18 pm, revuesbio [EMAIL PROTECTED] wrote:
On 7 mai, 03:52, John Machin [EMAIL PROTECTED] wrote:
On May 7, 7:44 am, revuesbio [EMAIL PROTECTED] wrote:
Hi
Does anyone have the python version of the conversion from msbin to
ieee?
Thank u
Yes, Google has it. Google is your friend. Ask Google. It will lead
you to such as:
http://mail.python.org/pipermail/python-list/2005-August/337817.html
HTH,
John
Thank you,
I've already read it but the problem is always present. this script is
for double precision MBF format ( 8 bytes).
It would have been somewhat more helpful had you said what you had
done so far, even posted your code ...
I try to adapt this script for single precision MBF format ( 4 bytes)
but i don't find the right float value.
for example : 'P\xad\x02\x95' will return '0.00024924660101532936'
If you know what the *correct* value is, you might like to consider
shifting left by log2(correct_value/erroneous_value) :-)
Do you have any known correct pairs of (mbf4 string, decimal_float
value)? My attempt is below -- this is based on a couple of
descriptive sources that my friend Google found, with no test data. I
believe the correct answer for the above input is 1070506.0 i.e. you
are out by a factor of 2 ** 32
def mbf4_as_float(s):
m0, m1, m2, m3 = [ord(c) for c in s]
exponent = m3
if not exponent:
return 0.0
sign = m2 0x80
m2 |= 0x80
mant = (((m2 8) | m1) 8) | m0
adj = 24 + 128
num = mant * 2.0 ** (exponent - adj)
if sign:
return -num
return num
HTH,
John
well done ! it's exactly what i'm waiting for !!
my code was: from struct import *
x = list(unpack('','P\xad\x02\x95'))
x
[80, 173, 2, 149]
def conversion1(bytes):
b=bytes[:]
sign = bytes[-2] 0x80
b[-2] |= 0x80
exp = bytes[-1] - 0x80 - 56
acc = 0L
for i,byte in enumerate(b[:-1]):
acc |= (long(byte)(i*8))
return (float(acc)*2.0**exp)*((1.,-1.)[sign!=0])
Apart from the 2**32 problem, the above doesn't handle *any* of the
2**24 different representations of zero. Try feeding \0\0\0\0' to it
and see what you get.
conversion1(x)
0.00024924660101532936
this script come from google groups but i don't understand bit-string
manipulation (I'm a newbie). informations about bit-string
manipulation with python is too poor on the net.
The basic operations (and, or, exclusive-or, shift) are not specific
to any language. Several languages share the same notation ( | ^
), having inherited it from C.
thank you very much for your script.
Don't thank me, publish some known correct pairs of values so that we
can verify that it's not just accidentally correct for 1 pair of
values.
pairs of values :
(bytes string, mbf4_as_float(s) result)right
float value
('P\xad\x02\x95', 1070506.0)
1070506.0
('\x00\x00\x00\x02', 5.8774717541114375e-039) 0.0
('\x00\x00\x00\x81', 1.0)
1.0
('\x00\x00\x00\x82', 2.0)
2.0
('[EMAIL PROTECTED]', 3.0)
3.0
('\x00\x00\x00\x83', 4.0)
4.0
('\x00\x00 \x83', 5.0)
5.0
('\xcd\xcc\x0c\x81', 1.100238418579) 1.1
('\xcd\xcc\x0c\x82', 2.200476837158) 2.2
('33S\x82', 3.299523162842) 3.3
('\xcd\xcc\x0c\x83', 4.400953674316) 4.4
('\x00\x00z\x8a', 1000.0)
1000.0
--
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Re: Getting some element from sets.Set
[EMAIL PROTECTED] wrote: In the particular case, I have to read an attribute from any one of the elements, which one doesn't matter because this attribute value is same across all elements in the set. Someone else pointed out that there might be better data structures. If performance was not an issue one approach would be illustrated by the following: Q=set(['A','a']) list(set(x.upper() for x in Q)) ['A'] This has the benefit that it does not assume all the elements of the set have the same value of the given attribute. Again not very efficient: list(Q)[0] 'A' I'm guessing this would be quicker iter(Q).next() 'A' -- http://mail.python.org/mailman/listinfo/python-list
Re: problem with quoted strings while inserting into varchar field of database.
On Mo, 7.05.2007, 11:32, Daniele Varrazzo wrote: On 7 Mag, 10:46, Stefan Sonnenberg-Carstens [EMAIL PROTECTED] wrote: On Mo, 7.05.2007, 10:30, Daniele Varrazzo wrote: On 7 Mag, 08:55, krishnakant Mane [EMAIL PROTECTED] wrote: On 6 May 2007 11:22:52 -0700, Daniele Varrazzo [EMAIL PROTECTED] Every serious database driver has a complete and solid SQL escaping mechanism. This mechanism tipically involves putting placeholders in your SQL strings and passing python data in a separate tuple or dictionary. Kinda cur.execute(INSERT INTO datatable (data) VALUES (%s);, (pickled_data,)) I will try doing that once I get back to the lab. mean while I forgot to mention in my previous email that I use MySQLdb for python-mysql connection. Why not use qmark parameter passing (PEP 249) ? cur.execute(INSERT INTO datatable (data) VALUES (?); , (pickled_data,)) Then the DB driver will take care for you. import MySQLdb print MySQLdb.paramstyle format MySQLdb (as many other drivers) use format parameter passing. Not much difference w.r.t. qmark, at least when passing positional parameters: the placeholder is %s instead of ?. A difference is that format also allows named parameters (actually it should have been pyformat, but IIRC MySQLdb can also use named placeholders, even if they advertise format). Anyway it is only a matter of placeholder style: they both allow the driver to take care of data escaping, the concept the OT didn't know about. -- Daniele -- http://mail.python.org/mailman/listinfo/python-list %s is not a placeholder IMHO. What happens when using %s is, that the string given will be inserted where %s is; that is something python does as with every print or such. By using the qmark style, it is up the the implementation of the cursor.execute method to decide what to do. python itself, and it's string implementation, don't know anything to do with the qmark. So, IMHO it *makes* a difference: with %s the execute function sees a string and nothing more as the parameters are consumed away by the % substitution. with ?, the execute implementation must do it's best, it gets a string and a list/tuple with values. Cheers, Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: Getting some element from sets.Set
On 4 Mai, 10:23, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: It is not possible to index set objects. That is OK. But, what if I want to find some element from the Set. In the particular case, I have to read an attribute from any one of the elements, which one doesn't matter because this attribute value is same across all elements in the set. Just to clarify: do you want to just get an *arbitrary* element from the set or do you want to find a *specific* element in the set? In the first case you have to convert it to a list (as pointed out earlier in this thread): s = set(range(10)) list(s)[0] 0 In the second case, just use th in operator: 10 in s False 5 in s True Since you have to have a reference to the object for whose membership you are testing, you can just use this object. Stupid example: class Point: ... def __init__(self, x, y): ... self.x = x ... self.y = y ... l = [Point(n,n+2) for n in range(10)] s = set(l) Point(0,2) in s False l[0] in s True l[0].x,l[0].y (0, 2) Chris -- http://mail.python.org/mailman/listinfo/python-list
RE: Strange terminal behavior after quitting Tkinter application
From: Chris I'll admit to being surprised at seeing a claim that a tkinter application, started within an interactive session, without a mainloop, even runs... I could see it maybe happening from Idle, since Idle is running a tkinter mainloop, so the application bindings may have just become added widgets to the Idle loop (but of course, a second mainloop would conflict heavily). You can try by building a working Tkinter GUI interactively from the standard Python interpreter, and see that the GUI works (i.e. processes events) at the same time. If you build it as a class (such as the code in Chris's original post) it works; if you do it all directly, nothing happens until you run mainloop(). It works, but I'm not sure that it was intended to work that way. I think your problem is related to that difference. You'll probably be better off creating a new interpreter window as part of your program, if you really need access to the interpreter alongside your GUI. You may be able to extract IDLE's interpreter window and use it directly. --- -Bill Hamilton -- http://mail.python.org/mailman/listinfo/python-list
Re: msbin to ieee
On May 7, 10:00 pm, revuesbio [EMAIL PROTECTED] wrote:
On 7 mai, 13:21, John Machin [EMAIL PROTECTED] wrote:
On May 7, 6:18 pm, revuesbio [EMAIL PROTECTED] wrote:
On 7 mai, 03:52, John Machin [EMAIL PROTECTED] wrote:
On May 7, 7:44 am, revuesbio [EMAIL PROTECTED] wrote:
Hi
Does anyone have the python version of the conversion from msbin to
ieee?
Thank u
Yes, Google has it. Google is your friend. Ask Google. It will lead
you to such as:
http://mail.python.org/pipermail/python-list/2005-August/337817.html
HTH,
John
Thank you,
I've already read it but the problem is always present. this script is
for double precision MBF format ( 8 bytes).
It would have been somewhat more helpful had you said what you had
done so far, even posted your code ...
I try to adapt this script for single precision MBF format ( 4 bytes)
but i don't find the right float value.
for example : 'P\xad\x02\x95' will return '0.00024924660101532936'
If you know what the *correct* value is, you might like to consider
shifting left by log2(correct_value/erroneous_value) :-)
Do you have any known correct pairs of (mbf4 string, decimal_float
value)? My attempt is below -- this is based on a couple of
descriptive sources that my friend Google found, with no test data. I
believe the correct answer for the above input is 1070506.0 i.e. you
are out by a factor of 2 ** 32
def mbf4_as_float(s):
m0, m1, m2, m3 = [ord(c) for c in s]
exponent = m3
if not exponent:
return 0.0
sign = m2 0x80
m2 |= 0x80
mant = (((m2 8) | m1) 8) | m0
adj = 24 + 128
num = mant * 2.0 ** (exponent - adj)
if sign:
return -num
return num
HTH,
John
well done ! it's exactly what i'm waiting for !!
my code was: from struct import *
x = list(unpack('','P\xad\x02\x95'))
x
[80, 173, 2, 149]
def conversion1(bytes):
b=bytes[:]
sign = bytes[-2] 0x80
b[-2] |= 0x80
exp = bytes[-1] - 0x80 - 56
acc = 0L
for i,byte in enumerate(b[:-1]):
acc |= (long(byte)(i*8))
return (float(acc)*2.0**exp)*((1.,-1.)[sign!=0])
Apart from the 2**32 problem, the above doesn't handle *any* of the
2**24 different representations of zero. Try feeding \0\0\0\0' to it
and see what you get.
conversion1(x)
0.00024924660101532936
this script come from google groups but i don't understand bit-string
manipulation (I'm a newbie). informations about bit-string
manipulation with python is too poor on the net.
The basic operations (and, or, exclusive-or, shift) are not specific
to any language. Several languages share the same notation ( | ^
), having inherited it from C.
thank you very much for your script.
Don't thank me, publish some known correct pairs of values so that we
can verify that it's not just accidentally correct for 1 pair of
values.
--
http://mail.python.org/mailman/listinfo/python-list
Re: how do you implement a reactor without a select?
Notice that I copied the Twisted terminology, but I did not look at Twisted implementation because I did not want to use a select (I assume that the GUI mainloops do not use it either). Why do you assume that? It's a wrong assumption. Yielding a thread/process until the OS wakes it up because of IO to be performed is the proper way to go. And at least in unix, IO is _everything_, also mouse-movements and keyboard events. Most probably the OS will have specialized APIs (or some wrapper lib has) that allow for reactor registration for events of different kinds including timers. But basically, it's select - I mean you could easily offer a timer as a file-object as well. Not sure if that's done though. The trick I use is to store the actions to perform (which are callables identified by an integer) in an event dictionary and to run them in the mainlooop if the current time is greater than the scheduled time. I had to add a time.sleep(.001) call in the default_action to avoid consuming 100% of the CPU in the loop. I wonder if real mainloops are done in this way and how bad/good is this implementation compared to a serious one. Any suggestion/hint/ advice is well appreciated. Thanks, It's ok, but of course more wasteful than it needs to be - better would be full delegation to the OS. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Can Python Parse an MS SQL Trace?
On May 7, 8:34 am, Tim Golden [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: Can Python parse a trace file created with MS SQL's profiler? There are a few thousand lines in the trace file and I need to find the insert statements and the stored procedures. Unfortunately, I am not an SQL guru and was hoping Python could help. Mike Mike, Can I suggest that, since the answer is more to do with parsing and less to do with MSSQL (which simply generated the output) that you post an example of a trace file to some web location to see if anyone wants to pick up the challenge? I'm not at work so I don't have access to MSSQL, but I seem to remember that you can output/save as XML, which may make things easier (or at least interest a different group of people in having a look). I'm quite certain it can by done by Python; I did consider it myself a couple of months back, but my colleague spotted the problem before I'd really got into the code! TJG Good point. Unfortunately, I think our SQL Server must be too old for xml (we have version 8). The only save options I see is Trace Template, Trace File, Trace Table and SQL Script. Mike -- http://mail.python.org/mailman/listinfo/python-list
Unittest Automation
I'm trying to find a better way, a shell one-liner, that I can use to recurse through my project, find all my test_ modules, aggregate the TestCase classes into a suite, and run all my tests. Basically, what py.test does out of the box. Why am I having such trouble doing it? -- Read my blog! I depend on your acceptance of my opinion! I am interesting! http://ironfroggy-code.blogspot.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: problem with quoted strings while inserting into varchar field of database.
cur.execute(INSERT INTO datatable (data) VALUES (%s);, (pickled_data,)) %s is not a placeholder IMHO. What happens when using %s is, that the string given will be inserted where %s is; that is something python does as with every print or such. It is indeed. The behavior you describe would be true if i had used the % operator. Read better what i have written: There is no % operator. cur.execute() receives 2 parameters: a SQL string with placeholders and a tuple with values: it's not me mangling values into the SQL string. This is the driver responsibility and it has the chance because it receives SQL and values as two distinct parameters. The driver can ask the SQL string to contain placeholders either in qmark ? or in format %s style, but there is no functional difference. Notice that the placeholder is always %s and not %d or %f for integers or float: there is always an escaping phase converting each python object into a properly encoded string and then the placeholders are replaced with the value. This happens into the execute() machinery. By using the qmark style, it is up the the implementation of the cursor.execute method to decide what to do. python itself, and it's string implementation, don't know anything to do with the qmark. So, IMHO it *makes* a difference: with %s the execute function sees a string and nothing more as the parameters are consumed away by the % substitution. with ?, the execute implementation must do it's best, it gets a string and a list/tuple with values. Again, this would be true for cur.execute(sql % data): what i wrote is cur.execute(sql, data). -- Daniele -- http://mail.python.org/mailman/listinfo/python-list
Re: problem with quoted strings while inserting into varchar field of database.
On Mo, 7.05.2007, 16:26, Daniele Varrazzo wrote: cur.execute(INSERT INTO datatable (data) VALUES (%s);, (pickled_data,)) %s is not a placeholder IMHO. What happens when using %s is, that the string given will be inserted where %s is; that is something python does as with every print or such. It is indeed. The behavior you describe would be true if i had used the % operator. Read better what i have written: There is no % operator. cur.execute() receives 2 parameters: a SQL string with placeholders and a tuple with values: it's not me mangling values into the SQL string. This is the driver responsibility and it has the chance because it receives SQL and values as two distinct parameters. The driver can ask the SQL string to contain placeholders either in qmark ? or in format %s style, but there is no functional difference. Notice that the placeholder is always %s and not %d or %f for integers or float: there is always an escaping phase converting each python object into a properly encoded string and then the placeholders are replaced with the value. This happens into the execute() machinery. By using the qmark style, it is up the the implementation of the cursor.execute method to decide what to do. python itself, and it's string implementation, don't know anything to do with the qmark. So, IMHO it *makes* a difference: with %s the execute function sees a string and nothing more as the parameters are consumed away by the % substitution. with ?, the execute implementation must do it's best, it gets a string and a list/tuple with values. Again, this would be true for cur.execute(sql % data): what i wrote is cur.execute(sql, data). -- Daniele -- http://mail.python.org/mailman/listinfo/python-list Ashes on my head. -- http://mail.python.org/mailman/listinfo/python-list
Re: how do you implement a reactor without a select?
Michele Simionato [EMAIL PROTECTED] wrote: I wonder if real mainloops are done in this way and how bad/good is this implementation compared to a serious one. Any suggestion/hint/ advice is well appreciated. Thanks, Module sched in Python's standard library may suggest one clearly-better approach: when you know in advance when future events are scheduled for, sleep accordingly (rather than polling every millisecond). sched's sources are simple enough to study, and its architecture clean and strong enough that it's easy to extend to other cases, e.g. where previously-unscheduled events may be delivered from other threads, without necessarily hacking the sources. Specifically, sched implements the Dependency Injection DP: rather than just calling time.time and time.sleep, it accepts those two callables upon initialization. This makes it easy, among many other customizations, to pass instead of time.sleep a user-coded callable (typically a bound method) that sleeps by a wait-with-timeout on a Queue (so that other threads, by putting an event on the Queue in question, immediately wake up the scheduler, etc, etc). Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: problem with quoted strings while inserting into varchar field of database.
Ashes on my head. My fault: the difference is hard to spot indeed in the rather long line of the example. I should have been more explicit stating that the differences were: 1. missing explicit quotes around the placeholders (they are part of the escaped values), 2. no % operator: two parameters are passed instead. Best regards, -- Daniele -- http://mail.python.org/mailman/listinfo/python-list
Re: problem with quoted strings while inserting into varchar field of database.
On Mon, 2007-05-07 at 07:26 -0700, Daniele Varrazzo wrote: cur.execute(INSERT INTO datatable (data) VALUES (%s);, (pickled_data,)) %s is not a placeholder IMHO. What happens when using %s is, that the string given will be inserted where %s is; that is something python does as with every print or such. It is indeed. The behavior you describe would be true if i had used the % operator. Read better what i have written: There is no % operator. This confusion is precisely why I think the (py)format paramstyles should be deprecated in a future version of the DB-API spec. Question marks make it immediately obvious that something other than string formatting is happening, and if I'm not mistaken, question marks are SQL standard. -- Carsten Haese http://informixdb.sourceforge.net -- http://mail.python.org/mailman/listinfo/python-list
Re: BUSTED!!! 100% VIDEO EVIDENCE that WTC7 was controlled demolition!! NEW FOOTAGE!!! Ask yourself WHY havn't I seen this footage before?
In article [EMAIL PROTECTED], [EMAIL PROTECTED] says... On Sat, 05 May 2007 07:54:50 +0100, Eeyore [EMAIL PROTECTED] wrote: quasi wrote: Gib Bogle wrote: Ah, so the firefighters were in on the conspiracy! No, but the firefighters are very much aware that there is more to 9/11 than has been officially revealed. This is even more true at Pentagon. The firefighters there brought dogs trained to search for survivors and/or remains Sounds like good practice. and found nothing. And the significance of this is ? The plane was supposed to have passengers. quasi Yep, and they found them all, therefore, there were none for the dogs to find. -- http://mail.python.org/mailman/listinfo/python-list
Recommended validating XML parser?
We're looking for a current, supported, validating XML parser. Since it
seems like there are a few thousand out there, I though we'd see what
everyone else is using.
Bonus points if it can do something like:
foo = XMLParser(
xml
weight3000/weight
/xml
, dtd=file('/etc/weightfile.dtd'))
print foo.weight
3000
...or some variant on that theme.
--
Kirk Strauser
--
http://mail.python.org/mailman/listinfo/python-list
Re: problem with quoted strings while inserting into varchar field of database.
On Mo, 7.05.2007, 16:50, Carsten Haese wrote: On Mon, 2007-05-07 at 07:26 -0700, Daniele Varrazzo wrote: cur.execute(INSERT INTO datatable (data) VALUES (%s);, (pickled_data,)) %s is not a placeholder IMHO. What happens when using %s is, that the string given will be inserted where %s is; that is something python does as with every print or such. It is indeed. The behavior you describe would be true if i had used the % operator. Read better what i have written: There is no % operator. This confusion is precisely why I think the (py)format paramstyles should be deprecated in a future version of the DB-API spec. Question marks make it immediately obvious that something other than string formatting is happening, and if I'm not mistaken, question marks are SQL standard. -- Carsten Haese http://informixdb.sourceforge.net -- http://mail.python.org/mailman/listinfo/python-list At least, qmark style is well known to people working with prepared stmts etc. They look natural - and avoid (even my!) mistakes. On python-forum.de there was a discussion regarding inserting data into a sqlite db recently. If I remember correctly the guy was using the %s % data approach (yes, % operator) and failed. The pysqlite driver did the right thing using the qmark style. Even in the Python phrasebook there are examples of this ugly style. A deprecation warning for now would be fine. -- http://mail.python.org/mailman/listinfo/python-list
Re: how do you implement a reactor without a select?
On May 7, 4:39 pm, [EMAIL PROTECTED] (Alex Martelli) wrote: Michele Simionato [EMAIL PROTECTED] wrote: I wonder if real mainloops are done in this way and how bad/good is this implementation compared to a serious one. Any suggestion/hint/ advice is well appreciated. Thanks, Module sched in Python's standard library may suggest one clearly-better approach: when you know in advance when future events are scheduled for, sleep accordingly (rather than polling every millisecond). sched's sources are simple enough to study, and its architecture clean and strong enough that it's easy to extend to other cases, e.g. where previously-unscheduled events may be delivered from other threads, without necessarily hacking the sources. Specifically, sched implements the Dependency Injection DP: rather than just calling time.time and time.sleep, it accepts those two callables upon initialization. This makes it easy, among many other customizations, to pass instead of time.sleep a user-coded callable (typically a bound method) that sleeps by a wait-with-timeout on a Queue (so that other threads, by putting an event on the Queue in question, immediately wake up the scheduler, etc, etc). Alex I know about sched (it was the first thing I looked at): the problem is that sched adopt a blocking approach and it basically requires threads, whereas I wanted to avoid them. Diez B. Roggisch's reply is closer to my expectations: Most probably the OS will have specialized APIs (or some wrapper lib has) that allow for reactor registration for events of different kinds including timers. But what kind of specialized API do I have at my disposition for timers on Linux? It looks like this is the question I should have asked the first time ;) Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list
SkimpyGimpy PNG canvas w/ Javascript mouse tracking
ANN: SkimpyGimpy PNG canvas has Javascript mouse tracking The SkimpyGimpy PNG image canvas now can generate Javascript data structures which allow HTML pages to intelligently respond to mouse events over the image. Please read about the SkimpyGimpy Canvas and look at the mouse tracking example here: http://skimpygimpy.sourceforge.net/canvas.html The SkimpyGimpy main page is here: http://skimpygimpy.sourceforge.net/ BACKGROUND: SkimpyGimpy is a collection of tools for generating HTML visual, PNG image, and WAVE audio components for use in web based applications including CAPTCHA implementations (Completely Automated Public Turing test to tell Computers and Humans Apart) and PNG image creation tools with Javascript mouse tracking support. I hope you like. -- Aaron Watters === Sometimes say sometimes. -- http://mail.python.org/mailman/listinfo/python-list
Re: Recommended validating XML parser?
Kirk Strauser wrote:
We're looking for a current, supported, validating XML parser. Since it
seems like there are a few thousand out there, I though we'd see what
everyone else is using.
You are asking for lxml, right?
http://codespeak.net/lxml/
Bonus points if it can do something like:
foo = XMLParser(
xml
weight3000/weight
/xml
, dtd=file('/etc/weightfile.dtd'))
print foo.weight
3000
...or some variant on that theme.
Not currently supported, only document internal DTD references are used. But
you can always validate the document *after* parsing, be it with DTD,
XMLSchema or RNG.
BTW, adding this would be straight forward. The implementation is there, it's
just not available at the API level (and I'm not sure enough how it should
look like...)
Stefan
--
http://mail.python.org/mailman/listinfo/python-list
Re: ftplib acting weird
On May 4, 3:43 am, Merrigan [EMAIL PROTECTED] wrote: Hi All, I have written a little script to upload some files to an ftp folder. The problem is as follows : I wrote the script on my windows laptop, and I want to run it from mylinux server. Everything worked fine so I uploaded it to my linux machine. Every time I tun the script I get the following error: *** [EMAIL PROTECTED] ftpsync]# python ftpsync.py !! The Connection to the Server Could not be established. Please Check all neccesary settings and run the script again. Thank you !! Traceback (most recent call last): File ftpsync.py, line 194, in ? ftplisting() File ftpsync.py, line 83, in ftplisting ftpconn.cwd(remotedir) #This changes to the remote directory File /usr/lib64/python2.4/ftplib.py, line 494, in cwd return self.voidcmd(cmd) File /usr/lib64/python2.4/ftplib.py, line 245, in voidcmd self.putcmd(cmd) File /usr/lib64/python2.4/ftplib.py, line 175, in putcmd self.putline(line) File /usr/lib64/python2.4/ftplib.py, line 170, in putline self.sock.sendall(line) AttributeError: 'NoneType' object has no attribute 'sendall' [EMAIL PROTECTED] ftpsync]# *** When I copy the same piece of scripting and run it from the python command shell, it works... what am I doing wrong? I have double checked everything about a million times, but to no avail. Blessings! Can you show the code? -- Carlos Hanson -- http://mail.python.org/mailman/listinfo/python-list
Re: c macros in python.
In article [EMAIL PROTECTED], Amaury Forgeot d'Arc [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] a écrit : Hey, I'm writing a script to generate code. I'm a bit tired of typing outfile.write(). Does python have a way to c-like macros? Every instance of o(...) in the code will be replaced by outfile.write(...)? First: Python has no macro facility. . . . For the sake of completeness, I want to note that the standard distribution includes Tools/Scripts/ifdef.py, and pyparsing now has an example macro preprocessor. Neither of these would be the correct response to the original question, of course, but they might interest other readers who believe they need c-like macros. -- http://mail.python.org/mailman/listinfo/python-list
Python-URL! - weekly Python news and links (May 7)
QOTW: As a general rule, *ALL* multithread operations are at least that troublesome, and most are far more so. - Gary Herron I'm a recent, belated convert from Perl. I work in a physics lab and have been using Python to automate a lot of measurement equipment lately. It works fabulously for this purpose. - Dan Lenski It *is* possible to copy a function--by replication of all its attributes. John Nagle explains why it's so difficult: http://groups.google.com/group/comp.lang.python/browse_thread/thread/2dfe7d6b150a0ec/ If you think you need a macro as C knows it in your Python code, you're almost certainly missing a far easier solution: http://groups.google.com/group/comp.lang.python/browse_thread/thread/4cda4dc6b78b94a9/ If you think you need difficult quoting to move your data from Python to a standard database, you're almost certainly missing an easier standard solution, perhaps involving parameter passing: http://groups.google.com/group/comp.lang.python/browse_thread/thread/7bf20c46b6e1f29e/ If you think you need abstruse (extended) regular expressions for your parsing ... well, maybe you're right. Informed opinion on this one is divided: http://groups.google.com/group/comp.lang.python/browse_thread/thread/a54607d8f2232a68/ Maxim Veksler exhibits more than a thousand non-blocking sockets all listening simultaneously. Jean-Paul Calderone shows how twisted does 'em better: http://groups.google.com/group/comp.lang.python/browse_thread/thread/f0d3dd52e754c1d0/ Microsoft's DLR appears to have substance: http://groups.google.com/group/comp.lang.python/browse_thread/thread/360c79cf6093d713/ [EMAIL PROTECTED] bounced for a while. Resend requests that were lost, please: http://groups.google.com/group/comp.lang.python/browse_thread/thread/3be0130e02ddcca4/ This is almost Foundational: how does one receive one element from a Set? http://groups.google.com/group/comp.lang.python/browse_thread/thread/4392b09c281feca2/ Many agitate for Python to build in a different GUI toolkit. Jeremiah Foster makes clear how to work with one of the alternatives--wxPython for Mac OS X: http://groups.google.com/group/comp.lang.python/browse_thread/thread/f73834fb0238d880/ Everything Python-related you want is probably one or two clicks away in these pages: Python.org's Python Language Website is the traditional center of Pythonia http://www.python.org Notice especially the master FAQ http://www.python.org/doc/FAQ.html PythonWare complements the digest you're reading with the marvelous daily python url http://www.pythonware.com/daily Mygale is a news-gathering webcrawler that specializes in (new) World-Wide Web articles related to Python. http://www.awaretek.com/nowak/mygale.html While cosmetically similar, Mygale and the Daily Python-URL are utterly different in their technologies and generally in their results. For far, FAR more Python reading than any one mind should absorb, much of it quite interesting, Planet Python indexes much of the universe of Pybloggers. http://www.planetpython.org/ The Python Papers aims to publish the efforts of Python enthusiats. http://pythonpapers.org/ Readers have recommended the Planet sites: http://planetpython.org http://planet.python.org comp.lang.python.announce announces new Python software. Be sure to scan this newsgroup weekly. http://groups.google.com/groups?oi=djqas_ugroup=comp.lang.python.announce Python411 indexes podcasts ... to help people learn Python ... Updates appear more-than-weekly: http://www.awaretek.com/python/index.html Steve Bethard continues the marvelous tradition early borne by Andrew Kuchling, Michael Hudson, Brett Cannon, Tony Meyer, and Tim Lesher of intelligently summarizing action on the python-dev mailing list once every other week. http://www.python.org/dev/summary/ The Python Package Index catalogues packages. http://www.python.org/pypi/ The somewhat older Vaults of Parnassus ambitiously collects references to all sorts of Python resources. http://www.vex.net/~x/parnassus/ Much of Python's real work takes place on Special-Interest Group mailing lists http://www.python.org/sigs/ Python Success Stories--from air-traffic control to on-line match-making--can inspire you or decision-makers to whom you're subject with a vision of what the language makes practical. http://www.pythonology.com/success The Python Software Foundation (PSF) has replaced the Python Consortium as an independent nexus of activity. It has official responsibility for
building python from source on HP
appreciate hints or pointers for building python on HP. running 'make test' fails with following cryptic message, after running configure, make. Attempting to build python from source on HP-UX host name B.11.11 U 9000/800 3314646674 unlimited-user license *** Error exit code 1 Stop. not sure if output from configure and make would make a difference. If so I can send them. thanks in advance Edwin The information contained in this message and any attachment may be proprietary, confidential, and privileged or subject to the work product doctrine and thus protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify me immediately by replying to this message and deleting it and all copies and backups thereof. Thank you. -- http://mail.python.org/mailman/listinfo/python-list
Re: long lists
On May 7, 5:14 am, Merrigan [EMAIL PROTECTED] wrote: On May 7, 10:18 am, Steven D'Aprano [EMAIL PROTECTED] wrote: On Mon, 07 May 2007 00:28:14 -0700, Merrigan wrote: 1. I have the script popping all the files that need to be checked into a list, and have it parsing the list for everything...Now the problem is this : The sever needs to check (at the moment) 375 files and eliminate those that don't need reuploading. This number will obviously get bigger and bigger as more files gets uploaded. Now, the problem that I'm having is that the script is taking forever to parse the list and give the final result. How can I speed this up? By writing faster code??? It's really hard to answer this without more information. In particular: - what's the format of the list and how do you parse it? - how does the script decide what files need uploading? -- Steven. Hi, Thanx for the reply, The Script it available at this url :http://www.lewendewoord.co.za/theScript.py P.S. I know it looks like crap, but I'm a n00b, and not yet through the OOP part of the tutorial. Thanx in advance! Do you have access to the machine via ssh? I would try to get away from FTP and use rsync for this kind of thing if possible. ~Sean -- http://mail.python.org/mailman/listinfo/python-list
Latest errors on pickled objects and blob datatypes in mysql
hello, finally the errors for my sql query have changed so I have even changed the thread subject because I feel now that this is not doable in mysql and this seams to be a bug, ither in python or the MySQLdb module or perhaps both. my table is called testobj and the blob field is called obj. now following is my query with the cursor named CSRInsert. CSRInsert.execute(insert into testobj (obj) values (?);,(pickled_object)) the error is, type error, not all arguments formatted during string formatting . can some one now figure out what could be the problem? -- http://mail.python.org/mailman/listinfo/python-list
getmtime differs between Py2.5 and Py2.4
I tried this on Windows only: In Python 2.4 os.path.getmtime returned the local time, in Python 2.5 it seems to return GMT: import os, time print ctime.time(os.path.getmtime(foo)) differs on Python 2.4 and Python 2.5 by the timezone. Now, the implementation of the two stat calls differs on Windows between the two versions. I actually like the new behaviour better, because I believe the reported time of a file should not depend on the timezone or other local settings, however the old behaviour is the time also Windows shows - and there is an incompatibility. Is this a bug? - Josef -- http://mail.python.org/mailman/listinfo/python-list
Re: how do you implement a reactor without a select?
Michele Simionato wrote: Notice that I copied the Twisted terminology, but I did not look at Twisted implementation because I did not want to use a select (I assume that the GUI mainloops do not use it either). The trick I use is to store the actions to perform (which are callables identified by an integer) in an event dictionary and to run them in the mainlooop if the current time is greater than the scheduled time. I had to add a time.sleep(.001) call in the default_action to avoid consuming 100% of the CPU in the loop. Busy-looping like that is ugly and inefficient, even with the sleep thrown in. Most GUI main loops _do_ use either select() or poll(). When Xt/GTK/ Qt/etc have function like gtk_add_input which takes an fd that you'll get notified about if it's written to while you're in the main loop, that's just adding another fd to the select() loop. There are other ways to wait for events on an fd, but they tend to be less portable. Depending on your Unix flavor, epoll, /dev/poll, kqueues, kevent, queued realtime signals, or something else might be available from the OS (but probably not from Python without futzing with ctypes or writing an extension). If you want details, check out http://www.kegel.com/c10k.html The alternatives usually aren't really faster unless you have hundreds of connections, though--select/poll have major portability advantages, so go with them unless you have a compelling reason. -- http://mail.python.org/mailman/listinfo/python-list
After the Deletion of Google Answers, . U Got Questions Fills the Gap Answering and Asking the Tough Questions
My friend asked some tough questions http://ugotquestions.blogspot.com/2007_05_01_archive.html unlike yahoo answers ( Which Generates Content with Answers ) U got questions picks only the best, Real Person Questions.,yeah so there is this second book called E.T. and the BOOK OF THE GREEN PLANET... yeah, what happens in it... i heard he dies, and what happend to elliot this has been bugging me for years...so someone please tell mehttp://ugotquestions.blogspot.com/2007_04_01_archive.html - i start my car and shut it off 4 to 5 times it starts fine but when i continue repeat this procedure for another 2 to 3 times then it dies. it doesnt start at all. the headlights and all other lights dont go dim so might not be the battery. then i have to wait for 3 to 5 minutes for it to start again. it does crank slowly sometime then start. the alternator was replaced 2 years ago so was the battery. the car has 129000miles its 01 maxima. automatic. as far as i think it could be the starter...http://ugotquestions.blogspot.com/2007/05/y-alert-yahoo- answers_7473.html 1- if you ask anyone in the town that: Are you a wise human? and he says yes, what you can say about him? 2- tree mathematicians are talking about their trip to this town: 1st man says: in my trip to the town, I ask John (a people of the town) are you a wise human? and with his reply, I could not rcognize what is he. 2nd man says: I also ask John are you a loony human? and with his reply, I could not recognize what is he too. 3rd man says: I also ask John are you a wise devil? and with his...http:// ugotquestions.blogspot.com/2007/05/y-alert-yahoo-answers_7075.html Which major should I choose before law school if I want to practice criminal and civil law and I also want in the future be a judge.The majors that I like are criminal justice,politcal science and finance.But I don't know which should I choose.I already know the speech that law schools don't care about your mayor but I want to know which one of those three could help me more in my goals fo practice criminal and civil law and be a judge.Thanks a lothttp:// ugotquestions.blogspot.com/2007/05/y-alert-yahoo-answers_6058.html Everyday I wake up to my mom yelling about something I did. All she does is come home from work sit on the couch and watch a movie she gets from blockbuster everyday while we are suppose to be doing chores. She dosnt let us watch her movies becuase she pays for them,. we dont have cable and we havnt gone grocery shopping in two months becuase she says we dont hav the money.( while she gets take out everyday at work and a blockbuster movie everyday to. )She told me i cant wash my clothes for... shaw loves this. -- http://mail.python.org/mailman/listinfo/python-list
Re: Latest errors on pickled objects and blob datatypes in mysql
On 7 Mag, 19:08, krishnakant Mane [EMAIL PROTECTED] wrote: hello, finally the errors for my sql query have changed so I have even changed the thread subject because I feel now that this is not doable in mysql and this seams to be a bug, ither in python or the MySQLdb module or perhaps both. And why not also a bug in MySQL? Or a neutrino hitting your CPU changing a 0 into an 1? Doesn't the Occam razor suggest it may be your fault? :) my table is called testobj and the blob field is called obj. now following is my query with the cursor named CSRInsert. CSRInsert.execute(insert into testobj (obj) values (?);,(pickled_object)) the error is, type error, not all arguments formatted during string formatting . can some one now figure out what could be the problem? Please, read the fine manual. if you had read the DBAPI documentation as previously suggested, you would know that you MUST use %s placeholder, not ? (because MySQLdb.paramstyle == 'format'). Just replace the placeholder in your sql string and keep passing sql and values as two distinct arguments. The second argument of the execute() method MUST be a tuple (or a mapping for named parameters, but let's stick to the positional ones). (pickled_object) is not a tuple, it is just an object in parenthesis. To represent a tuple with a single argument you must write (pickled_object,), notice the trailing comma. Try: CSRInsert.execute(insert into testobj (obj) values (%s);, (pickled_object,)) -- Daniele -- http://mail.python.org/mailman/listinfo/python-list
Re: Unittest Automation
On May 7, 7:29 am, Calvin Spealman [EMAIL PROTECTED] wrote: I'm trying to find a better way, a shell one-liner, that I can use to recurse through my project, find all my test_ modules, aggregate the TestCase classes into a suite, and run all my tests. Basically, what py.test does out of the box. Why am I having such trouble doing it? -- Read my blog! I depend on your acceptance of my opinion! I am interesting!http://ironfroggy-code.blogspot.com/ See Nose ... nose provides an alternate test discovery and running process for unittest, one that is intended to mimic the behavior of py.test as much as is reasonably possible without resorting to too much magic. ... http://somethingaboutorange.com/mrl/projects/nose/ Cheers, --Norm -- http://mail.python.org/mailman/listinfo/python-list
Re: Latest errors on pickled objects and blob datatypes in mysql
On 7 Mag, 19:08, krishnakant Mane [EMAIL PROTECTED] wrote: hello, finally the errors for my sql query have changed so I have even changed the thread subject because I feel now that this is not doable in mysql and this seams to be a bug, ither in python or the MySQLdb module or perhaps both. And why not also a bug in MySQL? Or a neutrino hitting your CPU changing a 0 into an 1? Doesn't the Occam razor suggest it may be your fault? :) my table is called testobj and the blob field is called obj. now following is my query with the cursor named CSRInsert. CSRInsert.execute(insert into testobj (obj) values (?);,(pickled_object)) the error is, type error, not all arguments formatted during string formatting . can some one now figure out what could be the problem? Please, read the fine manual. if you had read the DBAPI documentation as previously suggested, you would know that you MUST use %s placeholder, not ? (because MySQLdb.paramstyle == 'format'). Just replace the placeholder in your sql string and keep passing sql and values as two distinct arguments. The second argument of the execute() method MUST be a tuple (or a mapping for named parameters, but let's stick to the positional ones). (pickled_object) is not a tuple, it is just an object in parenthesis. To represent a tuple with a single argument you must write (pickled_object,), notice the trailing comma. Try: CSRInsert.execute(insert into testobj (obj) values (%s);, (pickled_object,)) -- Daniele -- http://mail.python.org/mailman/listinfo/python-list
Simulating simple electric circuits
Hello all, I'm trying to simulate simple electric logic (asynchronous) circuits. By simple I mean that I only want to know if I have current or no current (it's quite digital) and the only elements need to be (with some level of abstraction to my specific problem) - sources (here begin currents) - ground (here end currents) - joints - switches (which are able to let current pass or not, depending on outside influence) - loads (which can signal change in current flow to the outside -- just like a light bulb) Is there any library for this? I couldn't find one. I tried to implement this using objects that are two-way linked; every object has ports. For every port, there is - an input function (that is called by the neighbour if current comes in) - a reference to the neighbour's input function, to be able to let current flow the other way There is a master current controller object which tells the source object to start a current by calling its neighbour. The calls traverse the network until they reach a ground object. Specifically, the source passes a telegram instance with these calls, and everyone it passes through registers himself with it (telegrams are duplicated at joints). Then, the ground object calls back to the controller with all received telegrams. Like this I'm already able to get all possible ways through the network. But that's where my ideas go out. Let's assume there is a load in the middle of such a current, e. g. a light bulb. So if the current flows through it it gets notice of this because there is a telegram passing through it. But what if a contact before it now cuts the current, how could I notify all objects behind the cut? I tried several ways the past few days, but all lead to confusing (and non-working) code. (I'm sorry I can't provide any working code yet) Often it boils down to the need to check all possible ways in the entire network with every change. This shouldn't, in perfomance terms, be a big problem for me here, but it feels very dirty, and I smell inconsistencies. Another way I thought of is - to let load objects have a timer that resets their state to no flow after ~ 200 ms - pulse the network every ~ 100 ms from all sources to ground - and reset all load timers on the way. This feels even more dirty. There are several professional-grade simulation tools that track many other parameters, how do they work in general, is there a different strategy? I wonder if I'm making it too complicated or if I'm seeing problems where there really aren't any. I also looked at NetworkX, but I can't see how it might be of use yet. I appreciate all suggestions. Thanks for you consideration. Regards, Björn P.S.: This is no homework, it's pure hobby ;) -- BOFH excuse #70: nesting roaches shorted out the ether cable -- http://mail.python.org/mailman/listinfo/python-list
SOAPpy parameters in sequence
Hi, I am trying to send a message to a SOAP implementation where the parameters must in sequence. I am creating a SOAPProxy and then sending the message with: proxy.methodName(paramName=value, paramName2=value2) Is there a way to explicitly set the order of parameters? If not, is there a way to manually set the SOAP message body and send the message? Thanks -- View this message in context: http://www.nabble.com/SOAPpy-parameters-in-sequence-tf3705624.html#a10363179 Sent from the Python - python-list mailing list archive at Nabble.com. -- http://mail.python.org/mailman/listinfo/python-list
Re: Simulating simple electric circuits
On May 7, 7:05 pm, Bjoern Schliessmann usenet- [EMAIL PROTECTED] wrote: Hello all, I'm trying to simulate simple electric logic (asynchronous) circuits. By simple I mean that I only want to know if I have current or no current (it's quite digital) and the only elements need to be (with some level of abstraction to my specific problem) - sources (here begin currents) - ground (here end currents) - joints - switches (which are able to let current pass or not, depending on outside influence) - loads (which can signal change in current flow to the outside -- just like a light bulb) Is there any library for this? I couldn't find one. I tried to implement this using objects that are two-way linked; every object has ports. For every port, there is - an input function (that is called by the neighbour if current comes in) - a reference to the neighbour's input function, to be able to let current flow the other way There is a master current controller object which tells the source object to start a current by calling its neighbour. The calls traverse the network until they reach a ground object. Specifically, the source passes a telegram instance with these calls, and everyone it passes through registers himself with it (telegrams are duplicated at joints). Then, the ground object calls back to the controller with all received telegrams. Like this I'm already able to get all possible ways through the network. Then you can get all 'potential' paths that depend on one or more switches being on. Each path could know what switches it depends on and be 'active' if and only if all those switches are on. And each switch would know what paths depend on it. Similarly each lightbulb would know what paths it depends on and be 'on' if at least one path is active; and each path would know which lightbulbs it powers But that's where my ideas go out. Let's assume there is a load in the middle of such a current, e. g. a light bulb. So if the current flows through it it gets notice of this because there is a telegram passing through it. But what if a contact before it now cuts the current, how could I notify all objects behind the cut? I tried several ways the past few days, but all lead to confusing (and non-working) code. (I'm sorry I can't provide any working code yet) Often it boils down to the need to check all possible ways in the entire network with every change. This shouldn't, in perfomance terms, be a big problem for me here, but it feels very dirty, and I smell inconsistencies. When you turn a switch off, it would send a message to the paths that depend on it (maybe via the controller?) so that they would be deactivated. In turn the lightbulbs on these paths would be informed that they are no longer active. When you turn a switch on, it would send a message to the paths that depend on it so that those who do not have another off switch would be activated. In turn the lightbulbs on these paths would be informed that they have a new power source. It seems to me that it would work well with the way you started it out, but I may have misunderstood some aspects or overlooked some problems ;) -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: SOAPpy parameters in sequence
I figured it out. The SOAPPRoxy class has an attribute 'SOAPPRoxy.config.argsOrdering' You can set it to a dict. Each key is the name of a method, and the value is a list with the attributes in the correct order. -Dave D Unit wrote: Hi, I am trying to send a message to a SOAP implementation where the parameters must in sequence. I am creating a SOAPProxy and then sending the message with: proxy.methodName(paramName=value, paramName2=value2) Is there a way to explicitly set the order of parameters? If not, is there a way to manually set the SOAP message body and send the message? Thanks -- View this message in context: http://www.nabble.com/SOAPpy-parameters-in-sequence-tf3705624.html#a10363807 Sent from the Python - python-list mailing list archive at Nabble.com. -- http://mail.python.org/mailman/listinfo/python-list
is for reliable?
Hi to all I have a question about the for statement of python. I have the
following piece of code where cachefilesSet is a set that contains the
names of 1398 html files cached on my hard disk
for fn in cachefilesSet:
fObj = codecs.open( baseDir + fn + '-header.html', 'r', 'iso-8859-1' )
u = fObj.read()
v = u.lower()
rows = v.split('\x0a')
contentType = ''
for r in rows:
if r.find('content-type') != -1:
y = r.find(':')
if y != -1:
z = r.find(';', y)
if z != -1:
contentType = r[y+1:z].strip()
cE = r[z+1:].strip()
characterEncoding = cE.strip('charset = ')
else:
contenType = r[y+1:].strip()
characterEncoding = ''
break
if contentType == 'text/html':
processHTMLfile( baseDir + fn + '-body.html', characterEncoding,
cardinalita )
fileCnt += 1
if fileCnt % 100 == 0: print fileCnt
this code stops at the 473th file instead of reaching 1398
however I changed the for and substituted it with a while in this way
while cachefilesSet:
fn = cachefilesSet.pop()
...
...
the while loop reaches the 1398th file and is some 3-4 times faster than
the for loop
How is this possible?
--
http://mail.python.org/mailman/listinfo/python-list
Re: Simulating simple electric circuits
Arnaud Delobelle wrote: On May 7, 7:05 pm, Bjoern Schliessmann usenet- There is a master current controller object which tells the source object to start a current by calling its neighbour. The calls traverse the network until they reach a ground object. Specifically, the source passes a telegram instance with these calls, and everyone it passes through registers himself with it (telegrams are duplicated at joints). Then, the ground object calls back to the controller with all received telegrams. Like this I'm already able to get all possible ways through the network. Then you can get all 'potential' paths that depend on one or more switches being on. Each path could know what switches it depends on and be 'active' if and only if all those switches are on. And each switch would know what paths depend on it. Similarly each lightbulb would know what paths it depends on and be 'on' if at least one path is active; and each path would know which lightbulbs it powers In principle, I thought so too, but I didn't like the fact that this involves all possible circuits be determined only once. But it seems like there is no reasonable, different way. When you turn a switch off, it would send a message to the paths that depend on it (maybe via the controller?) so that they would be deactivated. In turn the lightbulbs on these paths would be informed that they are no longer active. When you turn a switch on, it would send a message to the paths that depend on it so that those who do not have another off switch would be activated. In turn the lightbulbs on these paths would be informed that they have a new power source. Yep. Looks like I have to do extended bookkeeping for this. I was looking for a more dynamic, general way. It seems to me that it would work well with the way you started it out, but I may have misunderstood some aspects or overlooked some problems ;) Thanks for your input. The biggest problem I got until now are the crummy interfaces for interconnection which quickly get inconcise. I've had a look at the NetworkX tutorial and it seems like this could simplify the code a bit. Regards, Björn -- BOFH excuse #173: Recursive traversal of loopback mount points -- http://mail.python.org/mailman/listinfo/python-list
