Re: how to get character hex number?
Tim Chase wrote:
> On 08/31/12 22:41, contro opinion wrote:
>>> u"english".encode("utf-8")
'english'
>>> u"english".encode("ascii")
'english'
how can i get 656e676c697368 in encode method?
>>>
>>> At least in 2.x, you can do:
>>>
>>> >>> u"english".encode("hex")
>>> '656e676c697368'
>>
>> how about in python3.0?
>
> Well, in 3.1.3 at least, using the u"..." notation dies on me with
> an invalid syntax. However, as Ian suggests, you can do
>
> my_str = "english"
> "".join("%02x" % c for c in my_str.encode("ascii"))
>
> or whatever other encoding you want instead of "ascii".
Another option:
>>> binascii.hexlify("english".encode()).decode()
'656e676c697368'
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Re: why i can't set locale?
contro opinion wrote: locale.setlocale(locale.LC_ALL, 'gbk') > Traceback (most recent call last): > File "", line 1, in > File "/usr/lib/python2.6/locale.py", line 513, in setlocale > return _setlocale(category, locale) > locale.Error: unsupported locale setting Try picking one of the locales listed by $ locale -a (Goggle suggests that you may be looking for "zh_CN.GBK") -- http://mail.python.org/mailman/listinfo/python-list
Re: to know binary
On 09/01/2012 12:59 AM, contro opinion wrote:
1) you top-posted
2) you replied privately, excluding the list from your query
> the file is utf-8 format,
str='/0x31/0x32/0x33/0x34'
3) No idea what that value is supposed to mean. Perhaps you intended to
use backslashes here? And perhaps you meant to omit the zeroes?
> why unicode(str,"utf-8").encode("utf-8") can not get 1234?
>
It gets a string, not an integer. And the string will be "1234" once
you fix the problems in the earlier line.
While you're at it, you should pick a better name for your string. str
already has a meaning in Python, and you're hiding that. No real harm
other than readability, but it'll be embarrassing when you actually need
to use the str() function and you end up trying to call your string.
Still not sure how to interpret your original message. You said nothing
about unicode, or conversions.
And I've been assuming you're using Python 2.x, but all this will be
different for 3.x
--
DaveA
--
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Async client for PostgreSQL?
Is there any extension for Python that can do async I/O for PostgreSQL with tornadoweb's ioloop? Something like: class MainHandler(tornado.web.RequestHandler): @tornado.web.asynchronous def get(self): pg_connection.(long_taking_query_sql,params,callback=self.on_query_opened) def on_query_opened(self, query): self.write(process_rows(query)) self.finish() What would be an alternative? The theoretical problem: suppose there are 100 clients (web browsers) connected to the server with keep alive connections. They are doing long-polls and they are also sending/receiving events (with short response times). Each web browser has an associated state stored on the server side, in the memory (as an object tree). The state is bound to the client with a session id. Most requests will have to be responded with small amounts of data, calculated from the session state, or queried from the database. Most database queries are simple, running for about 100msec. But a few of them will run for 1sec or more. Number of requests ending in database queries is relatively low (10/sec). Other requests can be responded must faster. but they are much more frequent (100/sec, that is. 1 request/sec/client). There is a big global cache full of (Python) objects. Their purpose is to reduce the number of database queries. These objects in the global cache are emitting events to other objects found in the client sessions. Generally, it is not possible to tell what request will end in a database query. Multi-threading is not an option because number of clients is too high (running 100 threads is not good). This is why I decided to use anyc I/O. Tornadoweb looks good for most requirements: async i/o, store session state in objects etc. The biggest problem is that psycopg is not compatible with this model. If I use blocking I/O calls inside a request handler, then they will block all other requests most of the time, resulting in slow response times. What would be a good solution for this? Thanks, Laszlo -- http://mail.python.org/mailman/listinfo/python-list
Re: Unittest - testing for filenames and filesize
On Saturday, September 1, 2012 12:19:10 AM UTC+8, Chris Withers wrote:
> On 23/08/2012 12:25, Tigerstyle wrote:
>
> > class FileTest(unittest.TestCase):
>
> >
>
> > def setUp(self):
>
> > self.origdir = os.getcwd()
>
> > self.dirname = tempfile.mkdtemp("testdir")
>
> > os.chdir(self.dirname)
>
>
>
> I wouldn't change directories like this, it's pretty fragile, just use
>
> absolute paths.
>
>
>
> > def test_1(self):
>
> > "Verify creation of files is possible"
>
> > for filename in ("this.txt", "that.txt", "the_other.txt"):
>
> > f = open(filename, "w")
>
> > f.write("Some text\n")
>
> > f.close()
>
> > self.assertTrue(f.closed)
>
> >
>
> > def test_2(self):
>
> > "Verify that current directory is empty"
>
> > self.assertEqual(glob.glob("*"), [], "Directory not empty")
>
> >
>
> > def tearDown(self):
>
> > os.chdir(self.origdir)
>
> > shutil.rmtree(self.dirname)
>
>
>
> Seeing this, you might find the following tools useful:
>
>
>
> http://packages.python.org/testfixtures/files.html
>
>
>
> cheers,
>
>
>
> Chris
>
>
>
> --
>
> Simplistix - Content Management, Batch Processing & Python Consulting
>
> - http://www.simplistix.co.uk
Well, I am thinking that the directory tree listing services or daemons
supported by the OS by some iterators could be better than the stack
based model.
--
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Re: to know binary
On 09/01/2012 12:15 AM, contro opinion wrote: > there is a only line in the file nanmed test: > 1234 > when i open it whit xxd > xxd test > what i get is : > 000: 3132 3334 0a 1234. > can you explain it ? > > > Explain what, exactly? Explain why you were able to run xxd without first installing Mumps? What is it you don't understand? Do you know hex? Are you familiar with the hex codes for common ASCII characters and control characters? Does the period at the end of the line bother you? Are you expecting some different number of zeroes in the address field? Since you're apparently running Linux/Unix, you can find xxd executable by using where xxd. And you can tell what kind of file it is by running file on it. xxd is evidently not written in Python. So why again are you asking here? -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: to know binary
On Sat, Sep 1, 2012 at 2:15 PM, contro opinion wrote: > there is a only line in the file nanmed test: > 1234 > when i open it whit xxd > xxd test > what i get is : > 000: 3132 3334 0a 1234. > can you explain it ? I would explain it as a file with one line named test: 1234 I would further explain that this uses Unix-style line endings. Any further explanations will require a much clearer question. Try this: http://www.catb.org/~esr/faqs/smart-questions.html ChrisA -- http://mail.python.org/mailman/listinfo/python-list
to know binary
there is a only line in the file nanmed test: 1234 when i open it whit xxd xxd test what i get is : 000: 3132 3334 0a 1234. can you explain it ? -- http://mail.python.org/mailman/listinfo/python-list
Re: how to get character hex number?
On 08/31/12 22:41, contro opinion wrote:
>> u"english".encode("utf-8")
>>> 'english'
>> u"english".encode("ascii")
>>> 'english'
>>>
>>> how can i get 656e676c697368 in encode method?
>>
>> At least in 2.x, you can do:
>>
>> >>> u"english".encode("hex")
>> '656e676c697368'
>
> how about in python3.0?
Well, in 3.1.3 at least, using the u"..." notation dies on me with
an invalid syntax. However, as Ian suggests, you can do
my_str = "english"
"".join("%02x" % c for c in my_str.encode("ascii"))
or whatever other encoding you want instead of "ascii".
-tkc
--
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Re: how to get character hex number?
On 08/31/12 21:21, contro opinion wrote:
for i in "english" :
> ... print(hex((ord(i
> ...
> 0x65
> 0x6e
> 0x67
> 0x6c
> 0x69
> 0x73
> 0x68
u"english".encode("utf-8")
> 'english'
u"english".encode("ascii")
> 'english'
>
> how can i get 656e676c697368 in encode method?
At least in 2.x, you can do:
>>> u"english".encode("hex")
'656e676c697368'
-tkc
--
http://mail.python.org/mailman/listinfo/python-list
Re: how to get character hex number?
On Fri, Aug 31, 2012 at 8:21 PM, contro opinion wrote:
for i in "english" :
> ... print(hex((ord(i
> ...
> 0x65
> 0x6e
> 0x67
> 0x6c
> 0x69
> 0x73
> 0x68
u"english".encode("utf-8")
> 'english'
u"english".encode("ascii")
> 'english'
>
> how can i get 656e676c697368 in encode method?
>>> ''.join("%02x" % ord(b) for b in u"english".encode("ascii"))
'656e676c697368'
--
http://mail.python.org/mailman/listinfo/python-list
how to get character hex number?
>>> for i in "english" :
... print(hex((ord(i
...
0x65
0x6e
0x67
0x6c
0x69
0x73
0x68
>>> u"english".encode("utf-8")
'english'
>>> u"english".encode("ascii")
'english'
how can i get 656e676c697368 in encode method?
--
http://mail.python.org/mailman/listinfo/python-list
why i can't set locale?
>>> locale.setlocale(locale.LC_ALL, 'gbk') Traceback (most recent call last): File "", line 1, in File "/usr/lib/python2.6/locale.py", line 513, in setlocale return _setlocale(category, locale) locale.Error: unsupported locale setting -- http://mail.python.org/mailman/listinfo/python-list
Re: thanks!
Tim Chase writes: > Or we can take the opportunity to thank you for all your work on > making this a relatively spam-free mailing list. So thanks! Indeed. This forum has a very high signal-to-noise ratio, largely due to efforts that are often invisible to the participants. Thank you! -- \“The problem with television is that the people must sit and | `\keep their eyes glued on a screen: the average American family | _o__) hasn't time for it.” —_The New York Times_, 1939 | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for an IPC solution
Zeromq (suggested by someone) is an option since it's pretty fast for most purposes, but I don't think it uses shared memory. Interesting question. The documentation says: http://api.zeromq.org/2-1:zmq-ipc The inter-process transport is currently only implemented on operating systems that provide UNIX domain sockets. (OFF: Would it be possible to add local IPC support for Windows using mmap()? I have seen others doing it.) At least, it is functional on Windows, and it excels on Linux. I just need to make transports configureable. Good enough for me. The closest thing I can think of to what you're asking is MPI, intended for scientific computation. I don't know of general purpose IPC that uses it though I've thought it would be interesting. There are also some shared memory modules around, including POSH for shared objects, but they don't switch between memory and sockets AFAIK. Based on your description, maybe what you really want is Erlang, or something like it for Python. There would be more stuff to do than just supply an IPC library. Yes, although I would really like to do this job in Python. I'm going to make some tests with zeromq. If the speed is good for local inter-process communication, then I'll give it a try. Thanks, Laszlo -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for an IPC solution
Laszlo Nagy shopzeus.com> writes: > > There are just so many IPC modules out there. I'm looking for a solution > for developing a new a multi-tier application. The core application will > be running on a single computer, so the IPC should be using shared > memory (or mmap) and have very short response times. But there will be a > tier that will hold application state for clients, and there will be > lots of clients. So that tier needs to go to different computers. E.g. > the same IPC should also be accessed over TCP/IP. Most messages will be > simple data structures, nothing complicated. The ability to run on PyPy > would, and also to run on both Windows and Linux would be a plus. How about the standard multiprocessing module? It supports shared memory, remote processes, and will most probably work under PyPy: http://docs.python.org/library/multiprocessing.html Regards Antoine. -- Software development and contracting: http://pro.pitrou.net -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for an IPC solution
Laszlo Nagy writes: > application will be running on a single computer, so the IPC should be > using shared memory (or mmap) and have very short response times. Zeromq (suggested by someone) is an option since it's pretty fast for most purposes, but I don't think it uses shared memory. The closest thing I can think of to what you're asking is MPI, intended for scientific computation. I don't know of general purpose IPC that uses it though I've thought it would be interesting. There are also some shared memory modules around, including POSH for shared objects, but they don't switch between memory and sockets AFAIK. Based on your description, maybe what you really want is Erlang, or something like it for Python. There would be more stuff to do than just supply an IPC library. -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for an IPC solution
On Friday, August 31, 2012 9:22:00 PM UTC+2, Laszlo Nagy wrote: > There are just so many IPC modules out there. I'm looking for a solution > > for developing a new a multi-tier application. The core application will > > be running on a single computer, so the IPC should be using shared > > memory (or mmap) and have very short response times. But there will be a > > tier that will hold application state for clients, and there will be > > lots of clients. So that tier needs to go to different computers. E.g. > > the same IPC should also be accessed over TCP/IP. Most messages will be > > simple data structures, nothing complicated. The ability to run on PyPy > > would, and also to run on both Windows and Linux would be a plus. > > > > I have seen a stand alone cross platform IPC server before that could > > serve "channels", and send/receive messages using these channels. But I > > don't remember its name and now I cannot find it. Can somebody please help? > > > > Thanks, > > > > Laszlo Hi, Are you aware and have you considered zeromq (www.zeromq.org)? It does not provide a messaging system, but you could use things like simple strings (json) or more complicated things like Protobuf. Marco -- http://mail.python.org/mailman/listinfo/python-list
Re: [pyxl] xlrd-0.8.0 .xlsx formatting_info=True not implemented
Hi, As a work-around, you could use the CRAN R package XLConnect, using RPy or RPy2, to do what you want. IIRC it's based on Java, so it's not extremely fast. http://cran.r-project.org/web/packages/XLConnect/vignettes/XLConnect.pdf This is another package I just saw for the first time http://cran.r-project.org/web/packages/xlsx/xlsx.pdf Regards, Albert-Jan ~~ All right, but apart from the sanitation, the medicine, education, wine, public order, irrigation, roads, a fresh water system, and public health, what have the Romans ever done for us? ~~ > > From: "python-ex...@raf.org" >To: python-ex...@googlegroups.com; Python List >Sent: Thursday, August 30, 2012 4:57 AM >Subject: Re: [pyxl] xlrd-0.8.0 .xlsx formatting_info=True not implemented > >John Yeung wrote: > >> > is there any other way to tell how many digits excel would round to >> > when displaying a floating point number? that's my only reason for >> > needing formatting_info=True. >> >> I have not personally used it, but OpenPyXL is another option for >> working with .xlsx files, and it might provide the formatting info you >> need: >> >> http://packages.python.org/openpyxl/index.html >> http://pypi.python.org/pypi/openpyxl/1.5.8 >> >> John Y. > >thanks but openpyxl doesn't work well enough. >most of the spreadsheets i need to read contain >dropdown lists with data validation using a named >formula like: OFFSET(Data!$K$2,0,0,COUNTA(Data!$K:$K),1) >which causes openpyxl to throw a NamedRangeException. >i don't even care about the named objects. i just want >to know what's in the cell, not what other possible >values the cell might have had. :-) > >apart from that, it does give access to number formats >so your suggestion would work for simpler spreadsheets. > >hopefully the intention that xlrd not support formats in xlsx >files will change one day into an intention to support them. :-) > >until then my users can keep manually saving xlsx files they >receive as xls before importing them. :-( > >maybe i need to investigate some perl modules or pyuno instead. >perl's Spreadsheet::XSLX module handles formats. it gets the >date formats a bit wrong but it's workaroundable. > >cheers, >raf > >-- >You received this message because you are subscribed to the Google Groups >"python-excel" group. >To post to this group, send an email to python-ex...@googlegroups.com. >To unsubscribe from this group, send email to >python-excel+unsubscr...@googlegroups.com. >For more options, visit this group at >http://groups.google.com/group/python-excel?hl=en-GB. > > > >-- http://mail.python.org/mailman/listinfo/python-list
Looking for an IPC solution
There are just so many IPC modules out there. I'm looking for a solution for developing a new a multi-tier application. The core application will be running on a single computer, so the IPC should be using shared memory (or mmap) and have very short response times. But there will be a tier that will hold application state for clients, and there will be lots of clients. So that tier needs to go to different computers. E.g. the same IPC should also be accessed over TCP/IP. Most messages will be simple data structures, nothing complicated. The ability to run on PyPy would, and also to run on both Windows and Linux would be a plus. I have seen a stand alone cross platform IPC server before that could serve "channels", and send/receive messages using these channels. But I don't remember its name and now I cannot find it. Can somebody please help? Thanks, Laszlo -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter bug in Entry widgets on OS X
On 31 August 2012 16:41, Alister wrote: > On Fri, 31 Aug 2012 11:21:14 -0400, Kevin Walzer wrote: > >> On 8/31/12 11:18 AM, Arnaud Delobelle wrote: >> >> >>> I'm not trying to do anything. When a user presses the UP or DOWN >>> arrow, then a strange character is inserted in the Entry box. I'd >>> rather nothing happened. >>> >> Why is the user doing that? If they are trying to navigate to a >> different part of the interface, they need to use the tab key, not the >> arrow key. It's not a multi-line text widget and shouldn't be expected >> to work like one. So you make software that only behaves well when the user does what they're supposed to do? > I agree that it is unexpected in a single line entry box but isn't the 1st > rule of user interface design to assume the user is a moron & will do > things they are not supposed to do? > > Therefore invalid inputs should be handled gracefully (not just insert > random characters) which is what I think the original poster is > suggesting. Indeed. -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: thanks! (was "Test message - please ignore")
Tim Chase wrote: On 08/31/12 09:15, Skip Montanaro wrote: We just upgraded the Mailman installation on mail.python.org. Part of that installation includes spam filtering on messages gated from Usenet to the python- l...@python.org mailing list. This message is a quick test of that function. You can ignore it. Or we can take the opportunity to thank you for all your work on making this a relatively spam-free mailing list. So thanks! Seconded! :) -- http://mail.python.org/mailman/listinfo/python-list
Re: Unittest - testing for filenames and filesize
On 23/08/2012 12:25, Tigerstyle wrote:
class FileTest(unittest.TestCase):
def setUp(self):
self.origdir = os.getcwd()
self.dirname = tempfile.mkdtemp("testdir")
os.chdir(self.dirname)
I wouldn't change directories like this, it's pretty fragile, just use
absolute paths.
def test_1(self):
"Verify creation of files is possible"
for filename in ("this.txt", "that.txt", "the_other.txt"):
f = open(filename, "w")
f.write("Some text\n")
f.close()
self.assertTrue(f.closed)
def test_2(self):
"Verify that current directory is empty"
self.assertEqual(glob.glob("*"), [], "Directory not empty")
def tearDown(self):
os.chdir(self.origdir)
shutil.rmtree(self.dirname)
Seeing this, you might find the following tools useful:
http://packages.python.org/testfixtures/files.html
cheers,
Chris
--
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- http://www.simplistix.co.uk
--
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Basic python extension producing error: "dynamic module not initialized properly"
Hi,
I am trying to create an extension to call into a c++ library, a library
which simply returns a string, given a string. At first, a quick and
simple approach was tried (based on post
http://stackoverflow.com/questions/1615813/how-to-use-c-classes-with-ctypes)
in which the usual infrastructure for loading extensions is bypassed. A
working simple example is shown beneath:
myextension.cpp
#include
extern "C"
{
int test_func() {
return 10;
}
}
To execute in Python:
from ctypes import cdll
mlib=cdll.LoadLibrary("myextension.dll")
print( mlib.test_func() )
This works fine when function return type is a number, but not when a
string. C++ code returns char *, which is received by Python as a pointer,
which prints as a number, eg1755066468. Apparently, based on web posts
viewed, it seems data conversion is required, using a function such
as Py_BuildValue("s", str) from python.h. But this gave a similar result,
in which a pointer is received by Python instead of a string. The modified
function used in this case:
PyObject * test_func() {
return Py_BuildValue("s", "aString");
}
Resort was then made to the conventional approach of defining a method
table and initializing method. (Abandoned cdll.LoadLibrary(...) as
subsequently test_func was not recognised, and instead put the dll (.dll
changed to pyd) in /python26/DLLs.) The revised code:
myextension.cpp
#include
extern "C"
{
static PyObject * test_func(PyObject *self, PyObject *args)
{
return (PyObject *) 0;
}
static PyMethodDef TestMethods[] = {
{"test", test_func, METH_VARARGS, "test"},
{NULL, NULL, 0, NULL}
};
PyMODINIT_FUNC initlibTestExtnModule(void) {
(void) Py_InitModule("TestExtnModule", TestMethods);
}
}
Using the import statement "import libTestExtnModule" however produced the
following error message:
"SystemError: dynamic module not initialized properly"
As far as I know there is nothing wrong with the initialisation of the
extension code above. Perhaps the error is related to compilation. I
have not used distutils, but rather compiled externally and dropped the dll
(as pyd) into the /DLLs directory as mentioned. This should work, as far
as I know. Related to compilation, both MinGW and Python2.6 are 32 bit
versions, and g++ statements used were:
mingw32-g++ "-IC:\\Python26\\include" -O0 -g3 -Wall -c -fmessage-length=0
-o myextension.o "..\\myextension.cpp"
mingw32-g++ -LC:/Python26/libs -shared -o
libTestExtnModule.pyd myextension.o -lpython26
Any suggestions as to why the dynamic module is not initialising properly,
or as to how otherwise a string can be returned, would be greatly
appreciated.
Thanks
Jason
--
http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter bug in Entry widgets on OS X
On Fri, 31 Aug 2012 11:21:14 -0400, Kevin Walzer wrote: > On 8/31/12 11:18 AM, Arnaud Delobelle wrote: > > >> I'm not trying to do anything. When a user presses the UP or DOWN >> arrow, then a strange character is inserted in the Entry box. I'd >> rather nothing happened. >> > Why is the user doing that? If they are trying to navigate to a > different part of the interface, they need to use the tab key, not the > arrow key. It's not a multi-line text widget and shouldn't be expected > to work like one. I agree that it is unexpected in a single line entry box but isn't the 1st rule of user interface design to assume the user is a moron & will do things they are not supposed to do? Therefore invalid inputs should be handled gracefully (not just insert random characters) which is what I think the original poster is suggesting. -- Walk softly and carry a megawatt laser. -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter bug in Entry widgets on OS X
On 8/31/12 11:18 AM, Arnaud Delobelle wrote: I'm not trying to do anything. When a user presses the UP or DOWN arrow, then a strange character is inserted in the Entry box. I'd rather nothing happened. Why is the user doing that? If they are trying to navigate to a different part of the interface, they need to use the tab key, not the arrow key. It's not a multi-line text widget and shouldn't be expected to work like one. -- Kevin Walzer Code by Kevin http://www.codebykevin.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter bug in Entry widgets on OS X
On 31 August 2012 15:25, Kevin Walzer wrote: > On 8/31/12 6:18 AM, Arnaud Delobelle wrote: >> >> I'm very inexperienced with Tkinter (I've never used it before). All >> I'm looking for is a workaround, i.e. a way to somehow suppress that >> output. > > > What are you trying to do? Navigate the focus to another widget? You should > use the tab bar for that, not the arrow key. The entry widget is a > single-line widget, and doesn't have up/down as the text widget does. I'm not trying to do anything. When a user presses the UP or DOWN arrow, then a strange character is inserted in the Entry box. I'd rather nothing happened. -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: Flexible string representation, unicode, typography, ...
On Fri, Aug 31, 2012 at 6:32 AM, Steven D'Aprano wrote: > That's one thing that I'm unclear about -- under what circumstances will > a string be in compact versus non-compact form? I understand it to be entirely dependent on which API is used to construct. The legacy API generates legacy strings, and the new API generates compact strings. From the comments in unicodeobject.h: /* ASCII-only strings created through PyUnicode_New use the PyASCIIObject structure. state.ascii and state.compact are set, and the data immediately follow the structure. utf8_length and wstr_length can be found in the length field; the utf8 pointer is equal to the data pointer. */ ... Legacy strings are created by PyUnicode_FromUnicode() and PyUnicode_FromStringAndSize(NULL, size) functions. They become ready when PyUnicode_READY() is called. ... /* Non-ASCII strings allocated through PyUnicode_New use the PyCompactUnicodeObject structure. state.compact is set, and the data immediately follow the structure. */ Since I'm not sure that this is clear, note that compact vs. legacy does not describe which character width is used (except that PyASCIIObject strings are always 1 byte wide). Legacy and compact strings can each use the 1, 2, or 4 byte representations. "Compact" merely denotes that the character data is stored inline with the struct (as opposed to being stored somewhere else and pointed at by the struct), not the relative size of the string data. Again from the comments: Compact strings use only one memory block (structure + characters), whereas legacy strings use one block for the structure and one block for characters. Cheers, Ian -- http://mail.python.org/mailman/listinfo/python-list
Re: Flexible string representation, unicode, typography, ...
On Fri, 31 Aug 2012 08:43:55 -0400, Roy Smith wrote: > In article <503f8e33$0$30001$c3e8da3$54964...@news.astraweb.com>, > Steven D'Aprano wrote: > >> On Thu, 30 Aug 2012 07:02:24 -0400, Roy Smith wrote: >> > Is the implementation smart enough to know that x == y is always >> > False if x and y are using different internal representations? >> >> [...] There may be circumstances where two strings have different >> internal representations even though their content is the same > > If there is a deterministic algorithm which maps string content to > representation type, then I don't see how it's possible for two strings > with different representation types to have the same content. Could you > give me an example of when this might happen? There are deterministic algorithms which can result in the same result with two different internal formats. Here's an example from Python 2: py> sum([1, 2**30, -2**30, 2**30, -2**30]) 1 py> sum([1, 2**30, 2**30, -2**30, -2**30]) 1L The internal representation (int versus long) differs even though the sum is the same. A second example: the order of keys in a dict is deterministic but unpredictable, as it depends on the history of insertions and deletions into the dict. So two dicts could be equal, and yet have radically different internal layout. One final example: list resizing. Here are two lists which are equal but have different sizes: py> a = [0] py> b = range(1) py> del b[1:] py> a == b True py> sys.getsizeof(a) 36 py> sys.getsizeof(b) 48 Is PEP 393 another example of this? I have no idea. Somebody who is more familiar with the details of the implementation would be able to answer whether or not that is the case. I'm just suggesting that it is possible. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter bug in Entry widgets on OS X
On 8/31/12 6:18 AM, Arnaud Delobelle wrote: I'm very inexperienced with Tkinter (I've never used it before). All I'm looking for is a workaround, i.e. a way to somehow suppress that output. What are you trying to do? Navigate the focus to another widget? You should use the tab bar for that, not the arrow key. The entry widget is a single-line widget, and doesn't have up/down as the text widget does. -- Kevin Walzer Code by Kevin http://www.codebykevin.com -- http://mail.python.org/mailman/listinfo/python-list
Re: thanks! (was "Test message - please ignore")
On 08/31/12 09:15, Skip Montanaro wrote: > We just upgraded the Mailman installation on mail.python.org. Part of that > installation includes spam filtering on messages gated from Usenet to the > python- > l...@python.org mailing list. This message is a quick test of that function. > > You can ignore it. Or we can take the opportunity to thank you for all your work on making this a relatively spam-free mailing list. So thanks! -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: interfacing with x86_64 assembler
On 31/08/2012 14:58, Grant Edwards wrote: On 2012-08-31, Mark Lawrence wrote: On 31/08/2012 14:40, lipska the kat wrote: I was hacking away at some x86_64 assembler today when I found myself obsessively indenting my code by EXACTLY 4 spaces or (multiples thereof) What's wrong with structured assembler? :) Nothing -- it's called "C". You cannot be Cerious -- Cheers. Mark Lawrence. -- http://mail.python.org/mailman/listinfo/python-list
Test message - please ignore
We just upgraded the Mailman installation on mail.python.org. Part of that installation includes spam filtering on messages gated from Usenet to the python- l...@python.org mailing list. This message is a quick test of that function. You can ignore it. Skip Montanaro -- http://mail.python.org/mailman/listinfo/python-list
Re: interfacing with x86_64 assembler
On 2012-08-31, Mark Lawrence wrote: > On 31/08/2012 14:40, lipska the kat wrote: >> I was hacking away at some x86_64 assembler today >> when I found myself obsessively indenting my code >> by EXACTLY 4 spaces or (multiples thereof) > What's wrong with structured assembler? :) Nothing -- it's called "C". -- Grant Edwards grant.b.edwardsYow! Not SENSUOUS ... only at "FROLICSOME" ... and in gmail.comneed of DENTAL WORK ... in PAIN!!! -- http://mail.python.org/mailman/listinfo/python-list
Re: interfacing with x86_64 assembler
On 31/08/2012 14:40, lipska the kat wrote: Worryingly I was hacking away at some x86_64 assembler today when I found myself obsessively indenting my code by EXACTLY 4 spaces or (multiples thereof) Who'd have thought it. lipska What's wrong with structured assembler? :) -- Cheers. Mark Lawrence. -- http://mail.python.org/mailman/listinfo/python-list
interfacing with x86_64 assembler
Worryingly I was hacking away at some x86_64 assembler today when I found myself obsessively indenting my code by EXACTLY 4 spaces or (multiples thereof) Who'd have thought it. lipska -- Lipska the Kat©: Troll hunter, sandbox destroyer and farscape dreamer of Aeryn Sun -- http://mail.python.org/mailman/listinfo/python-list
Re: Flexible string representation, unicode, typography, ...
In article <503f8e33$0$30001$c3e8da3$54964...@news.astraweb.com>, Steven D'Aprano wrote: > On Thu, 30 Aug 2012 07:02:24 -0400, Roy Smith wrote: > > Is the implementation smart enough to know that x == y is always False > > if x and y are using different internal representations? > > [...] There may be circumstances where two strings have different > internal representations even though their content is the same If there is a deterministic algorithm which maps string content to representation type, then I don't see how it's possible for two strings with different representation types to have the same content. Could you give me an example of when this might happen? -- http://mail.python.org/mailman/listinfo/python-list
Re: Flexible string representation, unicode, typography, ...
On Thu, 30 Aug 2012 16:44:32 -0400, Terry Reedy wrote: > On 8/30/2012 12:00 PM, Steven D'Aprano wrote: >> On Thu, 30 Aug 2012 07:02:24 -0400, Roy Smith wrote: [...] >>> Is the implementation smart enough to know that x == y is always False >>> if x and y are using different internal representations? > > Yes, after checking lengths, and in same circumstances, x != y is True. [snip C code] Thanks Terry for looking that up. > 'a in s' is also False if a chars are wider than s chars. Now that's a nice optimization! [...] >> But x and y are not necessarily always False just because they have >> different representations. There may be circumstances where two strings >> have different internal representations even though their content is >> the same, so it's an unsafe optimization to automatically treat them as >> unequal. > > I am sure that str objects are always in canonical form once visible to > Python code. Note that unready (non-canonical) objects are rejected by > the rich comparison function. That's one thing that I'm unclear about -- under what circumstances will a string be in compact versus non-compact form? Reading between the lines, I guess that a lot of the complexity of the implementation only occurs while a string is being built. E.g. if you have Python code like this: ''.join(str(x) for x in something) # a generator expression Python can't tell how much space to allocate for the string -- it doesn't know either the overall length of the string or the width of the characters. So I presume that there is string builder code for dealing with that, and that it involves resizing blocks of memory. But if you do this: ''.join([str(x) for x in something]) # a list comprehension Python could scan the list first, find out the widest char, and allocate exactly the amount of space needed for the string. Even in Python 2, joining a list comp is much faster than joining a gen expression. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: XML parser: Element ordering?
On 08/31/2012 08:21 AM, Stefan Behnel wrote: > Florian Lindner, 31.08.2012 14:03: >> I plan to use the etree.ElementTree XML parser to parse a config file >> in which the order of the elements matter, e.g.: >> >> >> >> >> >> is not equal to: >> >> >> >> >> >> I have found different answers to the question if order matters in XML >> documents. So my question here: Does it matters (and is more or less >> guarenteed to matter in the future) for the ElementTree parser of >> python? > It matters for XML documents, so, yes, any XML parser will definitely > honour the document order (which is actually well defined for an XML > document). > > What you might be referring to is the case of a specific XML document > format, where the application (or sometimes specification) can explicitly > state that the element order in a given subtree has no meaning for the > semantics of the element and that therefore code must ignore the order in > which elements occur. But that won't magically make the parser ignore it > for you. That's a totally different level of abstraction and a deliberate > decision of the code that *uses* the parser. > > There is a place in xml documents which is defined to be unordered. That's the attributes within one element. is indistinguishable from: -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: XML parser: Element ordering?
Florian Lindner, 31.08.2012 14:03: > I plan to use the etree.ElementTree XML parser to parse a config file > in which the order of the elements matter, e.g.: > > > > > > is not equal to: > > > > > > I have found different answers to the question if order matters in XML > documents. So my question here: Does it matters (and is more or less > guarenteed to matter in the future) for the ElementTree parser of > python? It matters for XML documents, so, yes, any XML parser will definitely honour the document order (which is actually well defined for an XML document). What you might be referring to is the case of a specific XML document format, where the application (or sometimes specification) can explicitly state that the element order in a given subtree has no meaning for the semantics of the element and that therefore code must ignore the order in which elements occur. But that won't magically make the parser ignore it for you. That's a totally different level of abstraction and a deliberate decision of the code that *uses* the parser. Stefan -- http://mail.python.org/mailman/listinfo/python-list
XML parser: Element ordering?
Hello, I plan to use the etree.ElementTree XML parser to parse a config file in which the order of the elements matter, e.g.: is not equal to: I have found different answers to the question if order matters in XML documents. So my question here: Does it matters (and is more or less guarenteed to matter in the future) for the ElementTree parser of python? Thanks, Florian -- http://mail.python.org/mailman/listinfo/python-list
Re: Context manager to save/restore a name binding
Hi Ben, On 31/08/2012 03:36, Ben Finney wrote: That way, I can set ‘sys.dont_write_bytecode’ to the value I need in this part of the code, knowing that however the code continues the previous value of that setting will be restored to whatever it was before I touched it. Have I re-invented a context manager which already exists? Is there a better way to do what ‘preserve_value’ is doing? Depends on the context (ho ho..), but if it's testing, then have a look at: http://packages.python.org/testfixtures/mocking.html#the-context-manager There's plenty of other goodies you may like in there too... cheers, Chris -- Simplistix - Content Management, Batch Processing & Python Consulting - http://www.simplistix.co.uk -- http://mail.python.org/mailman/listinfo/python-list
Tkinter bug in Entry widgets on OS X
Hi all, I'm writing a small GUI on OS X (v. 10.7.4) using Tkinter. I'm using stock Python. It mostly works fine but there is a bug in Entry widgets: if and Entry widget has focus and I press the UP arrow, a "\uf700" gets inserted in the widget. If I press the DOWN arrow, a "\uf701" gets inserted. I'm very inexperienced with Tkinter (I've never used it before). All I'm looking for is a workaround, i.e. a way to somehow suppress that output. Thanks in advance, -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: Context manager to save/restore a name binding
Peter Otten <__pete...@web.de> writes: > You should wrap yield in a try ... finally. You might allow setting > the new value in the manager (untested): Thank you, both good advice. I would still like to know if Python already has something to make this unnecessary. -- \ “Compulsory unification of opinion achieves only the unanimity | `\of the graveyard.” —Justice Roberts in 319 U.S. 624 (1943) | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: Call perl to store data in DB
On Friday, August 31, 2012 2:49:32 PM UTC+5:30, Octavian Rasnita wrote:
> Maybe I didn't understand well, but if you want your Perl program to get and
> store the data submitted by the form, then the action of the form should
> point to the Perl script something like:
>
>
>
>
>
>
>
> So your "form" object in Python should set the action as the path to the Perl
> program.
>
>
>
> --
> Octavian
>
>
> - Original Message -
>
> From: "Mulla"
>
> Newsgroups: comp.lang.python
>
> To:
>
> Sent: Friday, August 31, 2012 11:40 AM
>
> Subject: Call perl to store data in DB
>
>
>
>
>
> > hey,
>
> >
>
> > when i submit the form in html , the entered data
> > (fname,lanme,uname.)all have to come in perl script to store that data
> > in DB.
>
> >
>
> >
>
> > Python View.py
>
> >
>
> >
>
> > def ProfileRegistration(request):
>
> >if request.user.is_authenticated():
>
> >return HttpResponseRedirect('/profile/')
>
> >if request.method == 'POST':
>
> >form = RegistrationForm(data=request.POST, files=request.FILES)
>
> >if form.is_bound and form.is_valid():
>
> >user =
> > User.objects.create_user(username=form.cleaned_data['username'],
>
> >email=form.cleaned_data['email'],
>
> >
> > password=form.cleaned_data['password'],)
>
> >new_user= user.save()
>
> >profile =
> > Profile(user=user,firstname=form.cleaned_data['firstname'],
>
> > lastname=form.cleaned_data['lastname'],
>
> > telephone=form.cleaned_data['telephone'],
>
> > service=form.cleaned_data['service'],
>
> > servicetype=form.cleaned_data['servicetype'],)
>
> >new_user = profile.save()
>
> > # messages.info(request, "Thank you for registration.Please login
> > to continue")
>
> > # login(request, new_user)
>
> >return HttpResponseRedirect('/dashboard/')
>
> >else:
>
> >return render_to_response('register.html',{'form':
> > form},context_instance=RequestContext(request))
>
> >else:
>
> >form = RegistrationForm()
>
> >context = {'form':form}
>
> >return render_to_response('register.html',context,
> > context_instance=RequestContext(request))
>
> >
>
> > Below in my perl script
>
> >
>
> >
>
> > #!/usr/bin/perl
>
> >
>
> > use strict;
>
> > use warnings;
>
> > use user;
>
> >
>
> >
>
> >
>
> > my $tempuser = new user ();
>
> >
>
> > if ($tempuser->readbyfirstname('Pervez') eq 1) {
>
> > # Continue processing since we found a match
>
> > if($tempuser->{lastname} eq 'Noel')
>
> >{
>
> >print "Name already exists, \n";
>
> >}
>
> > }
>
> >
>
> > my $tempuser1 = new user();
>
> > $tempuser1->readbyemail_id('mullaper...@gmail.com');
>
> >if($tempuser1->{email_id} eq 'mullaper...@gmail.com')
>
> >{
>
> >print "email_id is in use \n";
>
> >}
>
> >
>
> >
>
> >
>
> > my $tempuser2 = new user();
>
> > $tempuser2->readbyusername('Tim_sir');
>
> >if ($tempuser2->{username} eq 'Mulla')
>
> >{
>
> >print "username is already present\n";
>
> >}
>
> > else {
>
> > print "we have no match\n";
>
> > }
>
> >
>
> >my $tempuser4 = new user('pervez', '', 'mulla', 'mullaper...@gmail.com',
> > '193274198');
>
> >my $string = $tempuser4->{firstname};
>
> >my @c = split(//, $string);
>
> >my $userhash = "00$c[0]$c[-1]";
>
> >print "$userhash \n";
>
> >#$tempuser4->{userhash} = $userhash;
>
> >$tempuser4->setuserhash( "$userhash" );
>
> >$tempuser4->write;
>
> >
>
> >
>
> > when I submit data , that data must come in place "my $tempuser4 = new
> > user('pervez', '', 'mulla', 'mullaper...@gmail.com', '193274198');" ...
>
> >
>
> > how can I do this ...>>?
>
> >
>
> > Look forward for hear from you soon
>
> >
>
> > Thank You
>
> > --
>
> > http://mail.python.org/mailman/listinfo/python-list
Thank You Octavian
--
http://mail.python.org/mailman/listinfo/python-list
Re: Call perl to store data in DB
Maybe I didn't understand well, but if you want your Perl program to get and
store the data submitted by the form, then the action of the form should point
to the Perl script something like:
So your "form" object in Python should set the action as the path to the Perl
program.
--Octavian
- Original Message -
From: "Mulla"
Newsgroups: comp.lang.python
To:
Sent: Friday, August 31, 2012 11:40 AM
Subject: Call perl to store data in DB
> hey,
>
> when i submit the form in html , the entered data (fname,lanme,uname.)all
> have to come in perl script to store that data in DB.
>
>
> Python View.py
>
>
> def ProfileRegistration(request):
>if request.user.is_authenticated():
>return HttpResponseRedirect('/profile/')
>if request.method == 'POST':
>form = RegistrationForm(data=request.POST, files=request.FILES)
>if form.is_bound and form.is_valid():
>user =
> User.objects.create_user(username=form.cleaned_data['username'],
>email=form.cleaned_data['email'],
>
> password=form.cleaned_data['password'],)
>new_user= user.save()
>profile =
> Profile(user=user,firstname=form.cleaned_data['firstname'],
> lastname=form.cleaned_data['lastname'],
> telephone=form.cleaned_data['telephone'],
> service=form.cleaned_data['service'],
> servicetype=form.cleaned_data['servicetype'],)
>new_user = profile.save()
> # messages.info(request, "Thank you for registration.Please login
> to continue")
> # login(request, new_user)
>return HttpResponseRedirect('/dashboard/')
>else:
>return render_to_response('register.html',{'form':
> form},context_instance=RequestContext(request))
>else:
>form = RegistrationForm()
>context = {'form':form}
>return render_to_response('register.html',context,
> context_instance=RequestContext(request))
>
> Below in my perl script
>
>
> #!/usr/bin/perl
>
> use strict;
> use warnings;
> use user;
>
>
>
> my $tempuser = new user ();
>
> if ($tempuser->readbyfirstname('Pervez') eq 1) {
> # Continue processing since we found a match
> if($tempuser->{lastname} eq 'Noel')
>{
>print "Name already exists, \n";
>}
> }
>
> my $tempuser1 = new user();
> $tempuser1->readbyemail_id('mullaper...@gmail.com');
>if($tempuser1->{email_id} eq 'mullaper...@gmail.com')
>{
>print "email_id is in use \n";
>}
>
>
>
> my $tempuser2 = new user();
> $tempuser2->readbyusername('Tim_sir');
>if ($tempuser2->{username} eq 'Mulla')
>{
>print "username is already present\n";
>}
> else {
> print "we have no match\n";
> }
>
>my $tempuser4 = new user('pervez', '', 'mulla', 'mullaper...@gmail.com',
> '193274198');
>my $string = $tempuser4->{firstname};
>my @c = split(//, $string);
>my $userhash = "00$c[0]$c[-1]";
>print "$userhash \n";
>#$tempuser4->{userhash} = $userhash;
>$tempuser4->setuserhash( "$userhash" );
>$tempuser4->write;
>
>
> when I submit data , that data must come in place "my $tempuser4 = new
> user('pervez', '', 'mulla', 'mullaper...@gmail.com', '193274198');" ...
>
> how can I do this ...>>?
>
> Look forward for hear from you soon
>
> Thank You
> --
> http://mail.python.org/mailman/listinfo/python-list
--
http://mail.python.org/mailman/listinfo/python-list
Re: Call perl to store data in DB
On 31/08/2012 09:40, Mulla wrote: [snip] how can I do this ...>>? Look forward for hear from you soon Thank You Search the archives as it's the fourth time the question has been asked within a few weeks. -- Cheers. Mark Lawrence. -- http://mail.python.org/mailman/listinfo/python-list
Call perl to store data in DB
hey,
when i submit the form in html , the entered data (fname,lanme,uname.)all
have to come in perl script to store that data in DB.
Python View.py
def ProfileRegistration(request):
if request.user.is_authenticated():
return HttpResponseRedirect('/profile/')
if request.method == 'POST':
form = RegistrationForm(data=request.POST, files=request.FILES)
if form.is_bound and form.is_valid():
user =
User.objects.create_user(username=form.cleaned_data['username'],
email=form.cleaned_data['email'],
password=form.cleaned_data['password'],)
new_user= user.save()
profile =
Profile(user=user,firstname=form.cleaned_data['firstname'],
lastname=form.cleaned_data['lastname'],
telephone=form.cleaned_data['telephone'],
service=form.cleaned_data['service'],
servicetype=form.cleaned_data['servicetype'],)
new_user = profile.save()
# messages.info(request, "Thank you for registration.Please login to
continue")
# login(request, new_user)
return HttpResponseRedirect('/dashboard/')
else:
return render_to_response('register.html',{'form':
form},context_instance=RequestContext(request))
else:
form = RegistrationForm()
context = {'form':form}
return render_to_response('register.html',context,
context_instance=RequestContext(request))
Below in my perl script
#!/usr/bin/perl
use strict;
use warnings;
use user;
my $tempuser = new user ();
if ($tempuser->readbyfirstname('Pervez') eq 1) {
# Continue processing since we found a match
if($tempuser->{lastname} eq 'Noel')
{
print "Name already exists, \n";
}
}
my $tempuser1 = new user();
$tempuser1->readbyemail_id('mullaper...@gmail.com');
if($tempuser1->{email_id} eq 'mullaper...@gmail.com')
{
print "email_id is in use \n";
}
my $tempuser2 = new user();
$tempuser2->readbyusername('Tim_sir');
if ($tempuser2->{username} eq 'Mulla')
{
print "username is already present\n";
}
else {
print "we have no match\n";
}
my $tempuser4 = new user('pervez', '', 'mulla', 'mullaper...@gmail.com',
'193274198');
my $string = $tempuser4->{firstname};
my @c = split(//, $string);
my $userhash = "00$c[0]$c[-1]";
print "$userhash \n";
#$tempuser4->{userhash} = $userhash;
$tempuser4->setuserhash( "$userhash" );
$tempuser4->write;
when I submit data , that data must come in place "my $tempuser4 = new
user('pervez', '', 'mulla', 'mullaper...@gmail.com', '193274198');" ...
how can I do this ...>>?
Look forward for hear from you soon
Thank You
--
http://mail.python.org/mailman/listinfo/python-list
