Announcing a feature update (v1.3) of YaMA, the meeting assistant
Hi, Yet Another Meeting Assistant (YaMA), will help you with the Agenda, Meeting Invitations, Minutes of a Meeting as well as Action Items. If you are the assigned minute taker at any meeting, this tool is for you. Checkout http://yama.sourceforge.net/ YaMA is written in Python and Tkinter, is open source software released under GPLv2, and is hosted by SourceForge (www.sourceforge.net) Whats New in version 1.3 : 1. Usability enhancements 2. Minor Bug Fixes 3. Export Meeting Invitation and Action Items to iCalendar format to interoperate with other calendaring applications. Thanks and Regards, -- Atul -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Re: Mathematics in Python are not correct
Mark Dickinson [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] On May 11, 9:36 pm, Terry Reedy [EMAIL PROTECTED] wrote: | Do you have in mind any situations in which it is advantageous to have 0**0 | undefined? | (Playing devil's advocate here.) If you regard x**y as exp(y*log(x)) Which, of course, I was not, but for the sake of discussion | then it's not at all clear that 0.**0. should be considered well-defined. Then it seems equally dubious that 0.**y, y0, should be well-defined. It seems to me that lim as x goes to 0. exp(y*log(x)) is equally well defined whether y is 0 or not, even though there is a discontinuity in the limit. . ... | The big problem here is that the power operation is really trying | to combine two subtly different functionalities (integer powers | and real powers), with quite distinct use-cases, into a single | function. Which leads to problems: witness the mess that's | C99's pow specification: why does it make sense for (-2.0)**2.0 to | return 4.0, while (-2.0)**1.9 returns NaN? 2.5 raises an exception. In 3.0, (-2)**1. (3.999722741113-1.2566370355167477e-07j) | Incidentally, the decimal module is slightly schizophrenic about this: That module follows the IBM-led standard, no matter how crazy. Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: anonymous assignment
On Mon, 12 May 2008 03:40:03 +, Yves Dorfsman wrote: Paul Rubin wrote: You can just use a variable name than you ignore. It's traditional to use _ but it's not a special keyword, it's just a another variable name: y, _, d, _, _, _, _, _, _ = time.localtime() But you still have have a variable that's using memory for nothing. I find this unsatisfactory... Get over it… Or use `operator.itemgetter()`: In [36]: operator.itemgetter(0, 2)(time.localtime()) Out[36]: (2008, 12) :-) Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: Best technology for agent/web server architecture
2008/5/8 M.-A. Lemburg [EMAIL PROTECTED]: SOAP would be a good choice if you want to send to data to other servers as well, e.g. Java-based ones. XML-RPC and JSON are better for simple data structures. If you have control over both client and server and don't need to bother with other backends or frontends, Python pickle is the best choice. En Fri, 09 May 2008 05:41:07 -0300, Florencio Cano [EMAIL PROTECTED] escribió: I have control over agent and client but I'm not sure how to use pickle for this task. Do you suggest to pickle the objects that I want to send and send it over a usual socket? I have searched a bit in Google and I have seen that Pickle is insecure by default. What do you think about this? insecure means that someone could build a specially crafted pickle able to run arbitrary code on the unpickling environment. One way to avoid that is to only accept pickles from trusted sources: using SSL by example. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
hai friends
hai dear, may all good things come into your life today and always www.goodhistory5.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Is using range() in for loops really Pythonic?
Ivan Illarionov [EMAIL PROTECTED] writes: In such cases, the name 'dummy' is conventionally bound to the items from the iterator, for clarity of purpose [..] If a value isn't used, then I think the most clear name for it is unused. [...] Maybe my brain works differently, but I find both dummy and unused are extremely confusing names for loop counters. The loop begins to look like it doesn't iterate at all if its counter is dummy or unused. If it *counts* it is *used* and it's *not* dummy. The value is unused by any of the code inside the block. For the purposes of that block, it is a dummy value. That something *else* (the iterator driving the 'for') is taking care of knowing when the loop is finished is great. However, in the code the programmer is writing, the loop counter is entirely unused. Why reinvent the wheel when a common identifier naming convention is for the loop counter to use the variable names i, j and k (and so on if needed) (from Wikipedia http://en.wikipedia.org/wiki/Loop_counter ) That is also regrettably common in Python code. It still suffers from being unnecessarily ambiguous, since there are *also* plenty of loops using 'i', 'j', etc. where the loop counter *is* used. Differentiating these use cases by appropriate naming is, IMO, worth the effort of choosing a meaningful name. -- \ Ignorance more frequently begets confidence than does | `\ knowledge. —Charles Darwin, _The Descent of Man_, 1871 | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: cgitb performance issue
En Mon, 05 May 2008 15:56:26 -0300, Ethan Furman [EMAIL PROTECTED] escribió: I tried adding a form to our website for uploading large files. Personally, I dislike the forms that tell you you did something wrong and make you re-enter *all* your data again, so this one cycles and remembers your answers, and only prompts for the file once the rest of the entered data is good. However, the first time the form loads it can take up to 30 seconds... any ideas why? Hard to tell without looking at the code... And what has cgitb to do with this? -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Is using range() in for loops really Pythonic?
On May 11, 9:28 pm, Arnaud Delobelle [EMAIL PROTECTED] wrote:
Hi John, Arnaud;
Contrived example:
# Print 'hello' 10 times; x is not used
for x in xrange(10):
print 'hello'
I've used Fortran and C and so would tend to use either i,j,k as the
unused loop variable above, or, for clarity, call it something
descriptive like loop_count, if the loop body would be clearer.
I would also just use range for small, (especially small constant),
ranges.
# By changing what is iterated over, no unused variable:
from itertools import repeat
for msg in repeat('hello', 10):
print msg
I guess I would not go to the trouble of using itertools.repeat unless
it was simplifying/homogenising a larger expression - i.e if it was
part of some functional expression
I've never fealt the need for a separate repeat statement myself
either.
- Paddy.
P.S: I do understand that your examples are contrived. Just my
thoughts.
--
http://mail.python.org/mailman/listinfo/python-list
Re: anonymous assignment
Yves Dorfsman [EMAIL PROTECTED] writes: Paul Rubin wrote: Yves Dorfsman [EMAIL PROTECTED] writes: import time y, None, d, None, None, None, None = time.localtime() I know you can't assign anything to None, but I'm sure you get what I mean, a special keyword that means I don't care about this value. You can just use a variable name than you ignore. It's traditional to use _ but it's not a special keyword, it's just a another variable name: y, _, d, _, _, _, _, _, _ = time.localtime() But you still have have a variable that's using memory for nothing. No, you have one extra unused name binding. The values that you don't want to use have *already* been allocated by the time the above statement is executed. Name binding doesn't copy the values, it merely binds a name to them. There's no variable in the above statement. -- \ “Holy human pressure cookers, Batman!” —Robin | `\ | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: anonymous assignment
Yves Dorfsman [EMAIL PROTECTED] writes: Is there anyway to tell python I don't care about a value ? Say I want today's year and day, I'd like to do something like: import time y, None, d, None, None, None, None = time.localtime() I know you can't assign anything to None, but I'm sure you get what I mean, a special keyword that means I don't care about this value. In this particular case, there's got to be a better way than: d = time.local() y = d[0] d = d[1] I use Paul Rubin's solution (which is frown upon by many:), but it's true it would be nice for tuples to have something like an extract() method: y, d = time.localtime.extract(0, 2) Where mytuple.extract(i1, i2, i3...) would mean: tuple(mytuple[i] for i in (i1, i2, i3...)) Or perhaps allow indexing by tuples: mytuple[i1, i2, i3...] -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: Module python-magic on/for Windows?
On May 11, 11:42 pm, Larry Hale [EMAIL PROTECTED] wrote: THANKS, AGAIN, for the reply! :) Okay, now I -really- feel silly... : So, when I was going to try what you'd suggested, I noticed something peculiar: I hadn't changed anything on my system, but now, when I tried to import magic I got a missing DLL error. For a DIFFERENT DLL! This got me to thinking... Turns out, when I was having success earlier, I was -in- the C: \Program Files\GnuWin32\bin directory (where file.exe and related .dll files are). So I added C:\Program Files\GnuWin32\bin to the (system/Windows) PATH. Everything worked. I removed all the copious copies of the DLL, the magic files, etc., littering my hard drive in every other location. Still worked. 'Course, I don't honestly know why it didn't work with the files copied to other locales contained in the sys/Py paths... perhaps it was, as you mentioned, wanting the tree-structure to be the same? (I haven't the heart to check this out fully right now... *maybe* at a later time... ;) ) Yeah, I know. But HONESTLY! I could have -sworn- I'd already tried THAT... you know, all the obvious/I've been programming/working in computers (albeit 'Windows' until lately) for ~25 years; yeah, I'm a 'hacker'... stuff. I -swear-! [EGG ON FACE] [SIGH] Well, I'd say live and learn, but I'm still scratching my head. But, 'nough of that. Thanks for your replies, Michael, and I'm off to work _with_ the module now, then work-up my HowTo (and experiment with making an egg?? ;) )... Caio! -Larry :P :) On May 11, 11:09 pm, Michael Torrie [EMAIL PROTECTED] wrote: Larry Hale wrote: ALSO: I've even tried putting the 4 magic files INTO the .egg file... still no-go. :/ It's often the custom of programs ported from unix to windows to use the dll location as a key to find the other files that are typically in share, or etc. GTK, for example uses ../share and ../etc from the location where the dlls are stored (if the dlls are in a folder called bin). In this case I'd try making a folder in the Python25 folder called share and put the contents of the gnuwin32 share/file stuff in there. Should look something like this: c:/python25/share/file/magic.mime.mgc c:/python25/share/file/magic c:/python25/share/file/magic.mgc c:/python25/share/file/magic.mime Or, judging by a string I found in the dll itself, you might have to put the files here: c:/progra~1/File/share/file/magic Although if such a path really is hardcoded into the dll, this is certainly a bug, since it will fail on certain non-english windows systems. Anyway, who knows. Give these options a try. UPDATE: HOORAY!!! Well, actually, was about two steps forward, one back. But I've gotten it all sorted out now! :) I added C:\Program Files\GnuWin32\bin to the system/Windows PATH. This takes care of the various required DLLs/libs. The file source (previously linked from http://hupp.org/adam/hg/python-magic/) has the man pages. I'd overlooked these as they were only modified as necessary; the BSD part made me think they'd be the same as the same online versions I'd already read (that were *nix specific). Obviously, I was wrong. These had the default paths to the magic* files listed; C:\Program Files\File\share\file\. If one creates said directory structure and moves/copies/unpacks the magic (database) files THERE, then one may do: import magic test = magic.Magic() # -- New Magic class instance test.from_file( 'C:\\startrek.exe' ) # -- Yeah, I have an old Star Trek game file here to test with... :) 'MS-DOS executable, MZ for MS-DOS' # -- This is what's returned... Alternately, if one wishes to leave/place the magic files elsewhere, do like: test = magic.Magic( magic_file = 'C:\\Program Files\\GnuWin32\ \share\\file\\magic' ) # -- spec where/what the file is NOTE: Even if the magic_file location *is* specified, mime = True still works fine. (Haven't checked, but I presume the source simply tacks .mime to the filename automagically.) Obviously/also, one needn't specify the argument names if one uses proper argument order: magic.Magic( mime, magic_file ) :) THANKS SO MUCH, Michael, for your answers and helping me alone the way... :) Cheers, -Larry -- http://mail.python.org/mailman/listinfo/python-list
Re: computing with characters
En Tue, 06 May 2008 08:16:55 -0300, [EMAIL PROTECTED] escribió: I tend to do , .join(%s % e for e in item) Is there any difference between this and str()? Use the timeit module to measure performance: C:\TEMPpython -m timeit for i in xrange(1): str(i) 10 loops, best of 3: 81.8 msec per loop C:\TEMPpython -m timeit for i in xrange(1): '%s' % i 10 loops, best of 3: 78.5 msec per loop The %s version consistently wins in my system -2.5.1 on WinXP- for a wide range of inputs. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there no single/uniform RDBMS access API module for Python ?
Banibrata Dutta írta: Hi, Again a noob question. Based on this URL http://wiki.python.org/moin/DatabaseInterfaces , is it correct to conclude that there is no RDBMS agnostic, single/uniform DB access API for Python ? Something in the lines of JDBC for Java, DBD for Perl etc. ? How is the RDBMS change handled for solutions which need to work with different RDBMSs ?? http://www.python.org/dev/peps/pep-0249/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there no single/uniform RDBMS access API module for Python ?
On 5/12/08, Laszlo Nagy [EMAIL PROTECTED] wrote: Banibrata Dutta írta: Hi, Again a noob question. Based on this URL http://wiki.python.org/moin/DatabaseInterfaces , is it correct to conclude that there is no RDBMS agnostic, single/uniform DB access API for Python ? Something in the lines of JDBC for Java, DBD for Perl etc. ? How is the RDBMS change handled for solutions which need to work with different RDBMSs ?? http://www.python.org/dev/peps/pep-0249/ That appears to be only an API specification. Are there any implementations of that ? -- regards, Banibrata http://www.linkedin.com/in/bdutta http://octapod.wordpress.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there no single/uniform RDBMS access API module for Python ?
Found that SnakeSQL does implement DB2.0 API. However are there such implementations for MySQL ? On 5/12/08, Banibrata Dutta [EMAIL PROTECTED] wrote: On 5/12/08, Laszlo Nagy [EMAIL PROTECTED] wrote: Banibrata Dutta írta: Hi, Again a noob question. Based on this URL http://wiki.python.org/moin/DatabaseInterfaces , is it correct to conclude that there is no RDBMS agnostic, single/uniform DB access API for Python ? Something in the lines of JDBC for Java, DBD for Perl etc. ? How is the RDBMS change handled for solutions which need to work with different RDBMSs ?? http://www.python.org/dev/peps/pep-0249/ That appears to be only an API specification. Are there any implementations of that ? -- regards, Banibrata http://www.linkedin.com/in/bdutta http://octapod.wordpress.com -- regards, Banibrata http://www.linkedin.com/in/bdutta http://octapod.wordpress.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Module python-magic on/for Windows?
On May 11, 11:42 pm, Larry Hale [EMAIL PROTECTED] wrote: THANKS, AGAIN, for the reply! :) Okay, now I -really- feel silly... : So, when I was going to try what you'd suggested, I noticed something peculiar: I hadn't changed anything on my system, but now, when I tried to import magic I got a missing DLL error. For a DIFFERENT DLL! This got me to thinking... Turns out, when I was having success earlier, I was -in- the C: \Program Files\GnuWin32\bin directory (where file.exe and related .dll files are). So I added C:\Program Files\GnuWin32\bin to the (system/Windows) PATH. Everything worked. I removed all the copious copies of the DLL, the magic files, etc., littering my hard drive in every other location. Still worked. 'Course, I don't honestly know why it didn't work with the files copied to other locales contained in the sys/Py paths... perhaps it was, as you mentioned, wanting the tree-structure to be the same? (I haven't the heart to check this out fully right now... *maybe* at a later time... ;) ) Yeah, I know. But HONESTLY! I could have -sworn- I'd already tried THAT... you know, all the obvious/I've been programming/working in computers (albeit 'Windows' until lately) for ~25 years; yeah, I'm a 'hacker'... stuff. I -swear-! [EGG ON FACE] [SIGH] Well, I'd say live and learn, but I'm still scratching my head. But, 'nough of that. Thanks for your replies, Michael, and I'm off to work _with_ the module now, then work-up my HowTo (and experiment with making an egg?? ;) )... Caio! -Larry :P :) On May 11, 11:09 pm, Michael Torrie [EMAIL PROTECTED] wrote: Larry Hale wrote: ALSO: I've even tried putting the 4 magic files INTO the .egg file... still no-go. :/ It's often the custom of programs ported from unix to windows to use the dll location as a key to find the other files that are typically in share, or etc. GTK, for example uses ../share and ../etc from the location where the dlls are stored (if the dlls are in a folder called bin). In this case I'd try making a folder in the Python25 folder called share and put the contents of the gnuwin32 share/file stuff in there. Should look something like this: c:/python25/share/file/magic.mime.mgc c:/python25/share/file/magic c:/python25/share/file/magic.mgc c:/python25/share/file/magic.mime Or, judging by a string I found in the dll itself, you might have to put the files here: c:/progra~1/File/share/file/magic Although if such a path really is hardcoded into the dll, this is certainly a bug, since it will fail on certain non-english windows systems. Anyway, who knows. Give these options a try. UPDATE: HOORAY!!! Well, actually, was about two steps forward, one back. But I've gotten it all sorted out now! :) I added C:\Program Files\GnuWin32\bin to the system/Windows PATH. This takes care of the various required DLLs/libs. The file source (previously linked from http://hupp.org/adam/hg/python-magic/) has the man pages. I'd overlooked these as they were only modified as necessary; the BSD part made me think they'd be the same as the same online versions I'd already read (that were *nix specific). Obviously, I was wrong. These had the default paths to the magic* files listed; C:\Program Files\File\share\file\. If one creates said directory structure and moves/copies/unpacks the magic (database) files THERE, then one may do: import magic test = magic.Magic() # -- New Magic class instance test.from_file( 'C:\\startrek.exe' ) # -- Yeah, I have an old Star Trek game file here to test with... :) 'MS-DOS executable, MZ for MS-DOS' # -- This is what's returned... Alternately, if one wishes to leave/place the magic files elsewhere, do like: test = magic.Magic( magic_file = 'C:\\Program Files\\GnuWin32\ \share\\file\\magic' ) # -- spec where/what the file is NOTE: Even if the magic_file location *is* specified, mime = True still works fine. (Haven't checked, but I presume the source simply tacks .mime to the filename automagically.) Obviously/also, one needn't specify the argument names if one uses proper argument order: magic.Magic( mime, magic_file ) :) THANKS SO MUCH, Michael, for your answers and helping me alone the way... :) Cheers, -Larry -- http://mail.python.org/mailman/listinfo/python-list
Re: Is using range() in for loops really Pythonic?
On Mon, 12 May 2008 16:24:23 +1000, Ben Finney wrote: [...] That is also regrettably common in Python code. It still suffers from being unnecessarily ambiguous, since there are *also* plenty of loops using 'i', 'j', etc. where the loop counter *is* used. Differentiating these use cases by appropriate naming is, IMO, worth the effort of choosing a meaningful name. Even if the counter is not used inside the loop's body it's still in control of the whole loop and, IMO, any special discriminating and non- conventional name doesn't worth the added confusion. -- Ivan -- http://mail.python.org/mailman/listinfo/python-list
Re: do you fail at FizzBuzz? simple prog test
En Sat, 10 May 2008 22:12:37 -0300, globalrev [EMAIL PROTECTED] escribió: http://reddit.com/r/programming/info/18td4/comments claims people take a lot of time to write a simple program like this: Write a program that prints the numbers from 1 to 100. But for multiples of three print Fizz instead of the number and for the multiples of five print Buzz. For numbers which are multiples of both three and five print FizzBuzz. for i in range(1,101): if i%3 == 0 and i%5 != 0: print Fizz elif i%5 == 0 and i%3 != 0: print Buzz elif i%5 == 0 and i%3 == 0: print FizzBuzz else: print i is there a better way than my solution? is mine ok? Is it correct? Did you get at it in less than 15 minutes? If so, then it's OK. The original test was not write the most convoluted algorithm you can think of, nor write the best program to solve this. It was a *practical* test: if you can't get anything remotely working for such a simple problem in 15 minutes, we're not interested in your services. (We used this question last year - some people gave a sensible answer in less than 5 minutes, but others did not even know how to start) -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Module python-magic on/for Windows?
On May 12, 1:34 am, Larry Hale [EMAIL PROTECTED] wrote: The file source (previously linked from http://hupp.org/adam/hg/python-magic/) has the man pages... Err... I meant http://downloads.sourceforge.net/gnuwin32/file-4.21- bin.zip?modtime=1180175868big_mirror=1! :) -- http://mail.python.org/mailman/listinfo/python-list
Re: Module python-magic on/for Windows?
On May 12, 1:34 am, Larry Hale [EMAIL PROTECTED] wrote: The file source (previously linked from http://hupp.org/adam/hg/python-magic/) has the man pages... Err... I meant http://downloads.sourceforge.net/gnuwin32/file-4.21- bin.zip?modtime=1180175868big_mirror=1! :) -- http://mail.python.org/mailman/listinfo/python-list
Re: Is using range() in for loops really Pythonic?
John Salerno schreef: Ben Finney wrote: John Salerno [EMAIL PROTECTED] writes: num = 33 for x in xrange(10): print num += 1 Which is better done by 'num += 10'. Can you come up with an example that isn't trivially replaced with clearer code? That might make it clearer what your concern is. ::sigh:: No, unfortunately I don't have a strong enough grasp of Python to give a really in-depth example. I understand what you're asking though. Perhaps people don't use this idiom as much as I think they do, so to give a trivial example to support my point isn't helpful. Perhaps a function to print some text a number of times: def print_n(text, n): for i in xrange(n): print text (Though I guess you can replace that with print '\n'.join(msg * n) ) -- The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom. -- Isaac Asimov Roel Schroeven -- http://mail.python.org/mailman/listinfo/python-list
module global variables
hi to all! can i load a module passing to it, automatically and as default, all the caller's global variables to act as module's global variables? thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Python and the Bartender
[EMAIL PROTECTED] wrote: Incidentally, now that everyone knows English, writer would like to critique his behavior. I have leaned to the group for approval, at times by disparaging the efforts of others, but other times not. I have expressed negative emotion. Is anyone in earshot getting work done that I am interfering with? Otherwise, I might start telling jokes. Sincerely, Two For Bartenders. P.S. Please don't write the movies. -- http://mail.python.org/mailman/listinfo/python-list Huh? Nicol -- The three things to remember about Llamas: 1) They are harmless 2) They are deadly 3) They are made of lava, and thus nice to cuddle. -- http://mail.python.org/mailman/listinfo/python-list
Re: File Creation Not Working In A Thread Class?
bc90021 [EMAIL PROTECTED] wrote: On Sun, 11 May 2008 19:55:31 +, Duncan Booth wrote: 7stud [EMAIL PROTECTED] wrote: Â Â Â Â Â Â Â Â Â Â Â Â Â Â tempfileName = \proctemp\\ Â Â Â Â Â Â Â Â Â Â Â Â Â Â + self.matrix[c][0] + _other.txt\ It wouldn't exactly result in either of the error messages you posted, but I expect the spurious quote marks round the filename will be giving you problems. Surely you want the filename to be something like 'proctemp\fred_other.txt' rather than 'proctemp\fred_other.txt' with the spurious double quotes? Yup, that's what it was. I figured it out two seconds before this post. However, it will be interesting to see how it handles files with spaces in the name... It will handle spaces just fine. You need to try and understand the difference between passing arguments to a program, where the shell will try to parse the command line into separate arguments so spaces have to be escaped somehow, and calling a function within a program where no such parsing takes place. -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem with custom events in wxpython
On May 11, 11:27 pm, Frank Niessink [EMAIL PROTECTED] wrote: Hi Jimmy, 2008/5/11 Jimmy [EMAIL PROTECTED]: hi, all I'm having a problem with creating custom events in wxpython. I have a class A handling some data processing work and another class B of GUI matter. I need GUI to display information when data in A is updated. I know cutom events in wxpython may work. You may want to look at the pubsub module. Available as wx.lib.pubsub in wxPython:http://www.wxpython.org/docs/api/wx.lib.pubsub-module.html, and also available separately on PyPI:http://pypi.python.org/pypi/PyPubSub/ Cheers, Frank hi, thanks it works! however, it seems the message can not be exchanged between processes :( actually what I want to do is let a running process send data to GUI process and display it -- http://mail.python.org/mailman/listinfo/python-list
Re: Python doesn't recognize quote types
Dennis Lee Bieber [EMAIL PROTECTED] wrote: The sloppy use of single quote for the apostrophe is unfortunate G True, but that problem is outside of the Python community's control. Given that people do often refer to single quote when they mean apostrophe the error message should be written so as to minimise confusion. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is using range() in for loops really Pythonic?
Ivan Illarionov [EMAIL PROTECTED] writes: On Mon, 12 May 2008 16:24:23 +1000, Ben Finney wrote: [...] That is also regrettably common in Python code. It still suffers from being unnecessarily ambiguous, since there are *also* plenty of loops using 'i', 'j', etc. where the loop counter *is* used. Differentiating these use cases by appropriate naming is, IMO, worth the effort of choosing a meaningful name. Even if the counter is not used inside the loop's body it's still in control of the whole loop Not in Python it's not. The values that come out of the iterator aren't in control of the loop. The state for the loop is in the *iterator*, not the values that come out. Having access to the values that come from the iterator is usually useful, but regardless of whether one uses them or not, they're *not* controlling the loop, and it's confusing to imply that they are. So, when not using the values that come from the controlling iterator, it's good to make that explicit. If Python supported it, we might prefer to use no name at all for something that isn't used, but the 'for' syntax doesn't allow that. In the absence of supporting syntax, the next best thing is to choose a name that *does* make it explicit that the values will not be used. -- \ “All television is educational television. The question is: | `\ what is it teaching?” —Nicholas Johnson | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: Is using range() in for loops really Pythonic?
Paddy [EMAIL PROTECTED] writes: I've used Fortran and C and so would tend to use either i,j,k as the unused loop variable above, or, for clarity, call it something descriptive like loop_count, if the loop body would be clearer. The problem with all of these names is that they also have long precedent as names of values that *will* be used inside the loop. Because of the precedent of those names, choosing one of those names doesn't make it clear to the reader that the value is never used; they have no indication from you of that until they look over the code a few times. It's implicit rather than explicit. -- \ As I bit into the nectarine, it had a crisp juiciness about it | `\ that was very pleasurable - until I realized it wasn't a | _o__)nectarine at all, but A HUMAN HEAD!! -- Jack Handey | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: source beautifier
Stefan Behnel wrote: http://www.polystyle.com/features/python-beautifier.jsp I've never used it, but the example is quite clear. I tend to believe that running these tools on some average Python code would not even change whitespace. ;) I bet it's idempotent against _your_ code, but not in the context of python beginners or people who just made up their mind about what coding style to use. -- http://mail.python.org/mailman/listinfo/python-list
Re: do you fail at FizzBuzz? simple prog test
On 12 Mag, 09:00, Gabriel Genellina [EMAIL PROTECTED] wrote: En Sat, 10 May 2008 22:12:37 -0300, globalrev [EMAIL PROTECTED] escribió: http://reddit.com/r/programming/info/18td4/comments claims people take a lot of time to write a simple program like this: Write a program that prints the numbers from 1 to 100. But for multiples of three print Fizz instead of the number and for the multiples of five print Buzz. For numbers which are multiples of both three and five print FizzBuzz. for i in range(1,101): if i%3 == 0 and i%5 != 0: print Fizz elif i%5 == 0 and i%3 != 0: print Buzz elif i%5 == 0 and i%3 == 0: print FizzBuzz else: print i is there a better way than my solution? is mine ok? Is it correct? Did you get at it in less than 15 minutes? If so, then it's OK. The original test was not write the most convoluted algorithm you can think of, nor write the best program to solve this. It was a *practical* test: if you can't get anything remotely working for such a simple problem in 15 minutes, we're not interested in your services. (We used this question last year - some people gave a sensible answer in less than 5 minutes, but others did not even know how to start) -- Gabriel Genellina- Nascondi testo tra virgolette - - Mostra testo tra virgolette - As a test, I would leave out the last sentence, and see how many people (and how fast) figure out than a number can be multiple of three _and_ five and that the requirement is somehow incomplete ... Ciao - FB -- http://mail.python.org/mailman/listinfo/python-list
Re: module global variables
On May 12, 5:17 pm, pistacchio [EMAIL PROTECTED] wrote:
hi to all!
can i load a module passing to it, automatically and as default, all
the caller's global variables to act as module's global variables?
thanks
module = __import__('module', globals=globals())
I think that's what you're looking for.
- alex23
--
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Re: module global variables
On 12 Mag, 10:01, alex23 [EMAIL PROTECTED] wrote:
On May 12, 5:17 pm, pistacchio [EMAIL PROTECTED] wrote:
hi to all!
can i load a module passing to it, automatically and as default, all
the caller's global variables to act as module's global variables?
thanks
module = __import__('module', globals=globals())
I think that's what you're looking for.
- alex23
hmm, well, maybe yes.. should i ovveride the standard import function
of the module?
say that the module is called pycatrix, would adding this to the
module solve the problem?
def __import__('pycatrix', globals=globals()):
--
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Re: module global variables
On 12 Mag, 10:10, pistacchio [EMAIL PROTECTED] wrote:
On 12 Mag, 10:01, alex23 [EMAIL PROTECTED] wrote:
On May 12, 5:17 pm, pistacchio [EMAIL PROTECTED] wrote:
hi to all!
can i load a module passing to it, automatically and as default, all
the caller's global variables to act as module's global variables?
thanks
module = __import__('module', globals=globals())
I think that's what you're looking for.
- alex23
hmm, well, maybe yes.. should i ovveride the standard import function
of the module?
say that the module is called pycatrix, would adding this to the
module solve the problem?
def __import__('pycatrix', globals=globals()):
pardon, this:
def __import__('pycatrix', globals=globals()):
pass
--
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Re: do you fail at FizzBuzz? simple prog test
On May 11, 4:36 am, Grant Edwards [EMAIL PROTECTED] wrote: On 2008-05-11, John Machin [EMAIL PROTECTED] wrote: Write a program that prints the numbers from 1 to 100. But for multiples of three print Fizz instead of the number and for the multiples of five print Buzz. For numbers which are multiples of both three and five print FizzBuzz. for i in range(1,101): if i%3 == 0 and i%5 != 0: print Fizz elif i%5 == 0 and i%3 != 0: print Buzz elif i%5 == 0 and i%3 == 0: print FizzBuzz else: print i is there a better way than my solution? is mine ok? Try doing it using %3 and %5 only once each. for i in xrange(101): print ((,Fizz)[i%3==0] + (,Buzz)[i%5==0]) or str(i) His is better though, since it's more obvious what's intended. Here's one that's less opaque for i in xrange(101): s = if i%3 == 0: s += Fizz if i%5 == 0: s += Buzz if s: print s else: print i Let's not forget to generalise the problem and code it OOP-style :) class FizzBuzzer(object): def __init__(self, *fizzles): self.fizzles = fizzles def translate(self, n): return ''.join(val for (p, val) in self.fizzles if not n%p) or n def range(self, start, stop=None, step=None): if stop is None: start, stop = 0, start if step is None: step = 1 for n in xrange(start, stop, step): yield self.translate(n) def __getitem__(self, obj): if isinstance(obj, slice): return self.range(obj.start, obj.stop, obj.step) else: return self.translate(obj) # FizzBuzzer in action: fizzbuzz = FizzBuzzer((3, 'Fizz'), (5, 'Buzz')) for val in fizzbuzz[1:21]: ... print val ... 1 21 1 1 2 Fizz 4 Buzz Fizz 7 8 Fizz Buzz 11 Fizz 13 14 FizzBuzz 16 17 Fizz 19 Buzz abc = FizzBuzzer((2, 'Ah'), (3, 'Bee'), (5, 'Cee')) list(abc[25:35]) 25 35 1 ['Cee', 'Ah', 'Bee', 'Ah', 29, 'AhBeeCee', 31, 'Ah', 'Bee', 'Ah'] -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: threading - race condition?
On May 11, 10:16 am, skunkwerk [EMAIL PROTECTED] wrote:
On May 10, 1:31 pm, Dennis Lee Bieber [EMAIL PROTECTED] wrote:
On Fri, 9 May 2008 08:40:38 -0700 (PDT),skunkwerk[EMAIL PROTECTED]
declaimed the following in comp.lang.python:
Coming in late...
On May 9, 12:12 am, John Nagle [EMAIL PROTECTED] wrote:
skunkwerkwrote:
i've declared a bunch of workerthreads(100) and a queue into which
new requests are inserted, like so:
snip
queue = Queue.Queue(0)
WORKERS=100
for i in range(WORKERS):
thread = SDBThread(queue)
thread.setDaemon(True)
thread.start()
the thread:
class SimpleDBThread ( threading.Thread ):
def __init__ ( self, queue ):
self.__queue = queue
Note: double-leading __ means name mangling -- typically only
needed when doing multiple layers of inheritance where different parents
have similar named items that need to be kept independent; a single _ is
the convention for don't touch me unless you know what you are doing
threading.Thread.__init__ ( self )
def run ( self ):
while 1:
item = self.__queue.get()
if item!=None:
model = domain.get_item(item[0])
logger.debug('sdbthread item:'+item[0])
title = model['title']
scraped = model['scraped']
logger.debug(sdbthread title:+title)
any suggestions?
thanks
snip
thanks John, Gabriel,
here's the 'put' side of the requests:
def prepSDBSearch(results):
modelList = [0]
counter=1
for result in results:
data = [result.item, counter, modelList]
queue.put(data)
counter+=1
while modelList[0] len(results):
print 'waiting...'#wait for them to come home
modelList.pop(0)#now remove '0'
return modelList
My suggestion, if you really want diagnostic help -- follow the
common recommendation of posting the minimal /runable (if erroneous)/
code... If domain.get_item() is some sort of RDBM access, you might
fake it using a pre-loaded dictionary -- anything that allows it to
return something when given the key value.
responses to your follow ups:
1) 'item' in thethreadsis a list that corresponds to the 'data'
list in the above function. it's not global, and the initial values
seem ok, but i'm not sure if every time i pass in data to the queue it
passes in the same memory address or declares a new 'data' list (which
I guess is what I want)
Rather confusing usage... In your put you have a list whose first
element is result.item, but then in the work thread, you refer to the
entire list as item
3) the first item in the modelList is a counter that keeps track of
the number ofthreadsfor this call that have completed - is there any
better way of doing this?
Where? None of your posted code shows either counter or modelList
being used by thethreads.
And yes, if you havethreadstrying to update a shared mutable, you
have a race condition.
You also have a problem if you are using counter to define where
in modelList a thread is supposed to store its results -- as you can not
access an element that doesn't already exist...
a = [0]
a[3] = 1#failure, need to create elements 1, 2, 3 first
Now, if position is irrelevant, and a thread just appends its
results to modelList, then you don't need some counter, all you need is
to check the length of modelList against the count expected.
Overall -- even though you are passing things via the queue, the
contents being pass via the queue are being treated as if they were
global entities (you could make modelList a global, remove it from the
queue entries, and have the same net access)...
IOWs, you have too much coupling between thethreadsand the feed
routine...
As for me... I'd be using a second queue for return values...
WORKERTHREADS = 100
feed = Queue.Queue()
result = Queue.Queue()
def worker():
while True:
(ID, item) = feed.get() #I leave the queues
globals
#since they perform locking
#internally
model = domain.get_item(item)
results.put( (ID, model[title], model[scraped]) )
for i in range(WORKERTHREADS):
aThread = threading.Thread(target=worker)
#overkill to subclass as there is now no specialized init
#and if I really wanted to make the queues non-global
Re: module global variables
pistacchio wrote: On 12 Mag, 10:01, alex23 [EMAIL PROTECTED] wrote: On May 12, 5:17 pm, pistacchio [EMAIL PROTECTED] wrote: hi to all! can i load a module passing to it, automatically and as default, all the caller's global variables to act as module's global variables? Are you positively sure you need this? Modifying imported modules is already quite fragile, but this.. it's basically a reversed(import *) It's quite messy. Where quite equals to very -- http://mail.python.org/mailman/listinfo/python-list
Import/Create module from buffer
Hi people, I'm currently working on python embedding with C++. My goal is that the C++ part handle files writing/reading so that the Python part only works with buffers. I succeeded in buffer exchanges. The problem is that some of the files I read/write are python files so that, before embedding, I imported them as modules when I needed them. But now that the Python part only receive buffers, I can't do it anymore. So I wonder : - is it possible to import module from a buffer instead of files? - or is it possible to create a module object from my buffer? I looked on the Internet but didn't find anything about that. Does anyone have an idea? Thanks Benjamin -- http://mail.python.org/mailman/listinfo/python-list
Re: do you fail at FizzBuzz? simple prog test
On May 12, 9:30 am, Arnaud Delobelle [EMAIL PROTECTED] wrote: [...] # FizzBuzzer in action: fizzbuzz = FizzBuzzer((3, 'Fizz'), (5, 'Buzz')) for val in fizzbuzz[1:21]: ... print val ... 1 21 1 Ignore this, it's debugging output 1 2 Fizz 4 Buzz Fizz 7 8 Fizz Buzz 11 Fizz 13 14 FizzBuzz 16 17 Fizz 19 Buzz abc = FizzBuzzer((2, 'Ah'), (3, 'Bee'), (5, 'Cee')) list(abc[25:35]) 25 35 1 ^ Same ['Cee', 'Ah', 'Bee', 'Ah', 29, 'AhBeeCee', 31, 'Ah', 'Bee', 'Ah'] -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: anonymous assignment
On May 12, 7:31 am, Arnaud Delobelle [EMAIL PROTECTED] wrote: Yves Dorfsman [EMAIL PROTECTED] writes: Is there anyway to tell python I don't care about a value ? Say I want today's year and day, I'd like to do something like: import time y, None, d, None, None, None, None = time.localtime() I know you can't assign anything to None, but I'm sure you get what I mean, a special keyword that means I don't care about this value. In this particular case, there's got to be a better way than: d = time.local() y = d[0] d = d[1] I use Paul Rubin's solution (which is frown upon by many:), but it's true it would be nice for tuples to have something like an extract() method: y, d = time.localtime.extract(0, 2) Where mytuple.extract(i1, i2, i3...) would mean: tuple(mytuple[i] for i in (i1, i2, i3...)) Or perhaps allow indexing by tuples: mytuple[i1, i2, i3...] -- Arnaud here is a very sophisticated implementation :) def extract(indices, seq): ... return tuple(seq[i] for i in indices) ... y, d = extract((0, 2), time.localtime()) y, d (2008, 12) -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: module global variables
On 12 Mag, 10:47, Marco Mariani [EMAIL PROTECTED] wrote: pistacchio wrote: On 12 Mag, 10:01, alex23 [EMAIL PROTECTED] wrote: On May 12, 5:17 pm, pistacchio [EMAIL PROTECTED] wrote: hi to all! can i load a module passing to it, automatically and as default, all the caller's global variables to act as module's global variables? Are you positively sure you need this? Modifying imported modules is already quite fragile, but this.. it's basically a reversed(import *) It's quite messy. Where quite equals to very well, i'm writing a module called pycatrix. within the module i have compile / exec statements in a functions that work on global variables. ( exec compiledTemplate in globals() ). now, i don't want to be forced (or force the end user) to import to call the module's function with a compulsory globals() as argument. -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem with custom events in wxpython
Hi Jimmy, 2008/5/12 Jimmy [EMAIL PROTECTED]: On May 11, 11:27 pm, Frank Niessink [EMAIL PROTECTED] wrote: 2008/5/11 Jimmy [EMAIL PROTECTED]: I have a class A handling some data processing work and another class B of GUI matter. I need GUI to display information when data in A is updated. I know cutom events in wxpython may work. You may want to look at the pubsub module. it works! however, it seems the message can not be exchanged between processes :( actually what I want to do is let a running process send data to GUI process and display it Well, that is some crucial information you didn't mention in your original question... I guess for the communication between processes you can use the regular python batteries available or something like Pyro. In your GUI process you can use a thread to listen/wait for new information to display and then send it to the main (GUI) thread. See http://wiki.wxpython.org/LongRunningTasks Cheers, Frank -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem with help() in python/ipython interpreters
En Fri, 09 May 2008 20:45:09 -0300, Casey [EMAIL PROTECTED] escribió: I'm running python 2.5.2 on WinXP. I've always used a GUI for interactive development, but I wanted to try out ipython which better supports matplotlib in this mode. Unfortunately, whenever I try to use help() I get the following error: (Sys) The system cannot find the file specified. C:\documents It turns out that the regular (python.exe) interpreter has the same problem. I have the HTML docs installed, my PYTHONDOCS environment variable points to the HTML directory, and I actually uninstalled and reinstalled every library I use from scratch to make sure it wasn't some random config issue. I don't know exactly how does help() try to find the documentation, but I have these differences: - I don't have a PYTHONDOCS variable (nor PYTHONPATH nor anything similar) - The Windows registry contains this entry: [HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\2.5\Help\Main Python Documentation] @=C:\\Apps\\Python25\\Doc\\Python25.chm - I *think* that I installed the HTML docs on that same directory a long time ago... Hope this info could help you. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Best technology for agent/web server architecture
Gabriel Genellina wrote: 2008/5/8 M.-A. Lemburg [EMAIL PROTECTED]: SOAP would be a good choice if you want to send to data to other servers as well, e.g. Java-based ones. XML-RPC and JSON are better for simple data structures. If you have control over both client and server and don't need to bother with other backends or frontends, Python pickle is the best choice. En Fri, 09 May 2008 05:41:07 -0300, Florencio Cano [EMAIL PROTECTED] escribió: I have control over agent and client but I'm not sure how to use pickle for this task. Do you suggest to pickle the objects that I want to send and send it over a usual socket? I have searched a bit in Google and I have seen that Pickle is insecure by default. What do you think about this? insecure means that someone could build a specially crafted pickle able to run arbitrary code on the unpickling environment. One way to avoid that is to only accept pickles from trusted sources: using SSL by example. While Pyro (http://pyro.sourceforge.net) uses pickle by default, it is well understood that you'll have to deal with a potential security issue if your server is open to untrusted/uncontrolled clients. Pyro provides several things that could help you here: - you can define a connection authenticator that checks client IP and/or passphrases - you can switch to an XML based serialisation protocol (courtesy of gnosis tools) - you can run Pyro over SSL and let SSL deal with authentication/encryption/... Cheers Irmen de Jong -- http://mail.python.org/mailman/listinfo/python-list
Re: anonymous assignment
On May 12, 4:28 am, Yves Dorfsman [EMAIL PROTECTED] wrote: there's got to be a better way than: d = time.local() y = d[0] d = d[1] Uses Python 2.6! ;) Python 2.6a3 (r26a3:62861, May 12 2008, 11:41:56) [GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2 Type help, copyright, credits or license for more information. import time time.localtime() time.struct_time(tm_year=2008, tm_mon=5, tm_mday=12, tm_hour=11, tm_min=43, tm_sec=47, tm_wday=0, tm_yday=133, tm_isdst=1) t=time.localtime() t.tm_year, t.tm_mday (2008, 12) -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there no single/uniform RDBMS access API module for Python ?
En Mon, 12 May 2008 03:52:59 -0300, Banibrata Dutta [EMAIL PROTECTED] escribió: Found that SnakeSQL does implement DB2.0 API. However are there such implementations for MySQL ? MySQLdb -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Is using range() in for loops really Pythonic?
On Mon, 12 May 2008 16:24:23 +1000, Ben Finney wrote: [...] That is also regrettably common in Python code. It still suffers from being unnecessarily ambiguous, since there are *also* plenty of loops using 'i', 'j', etc. where the loop counter *is* used. Differentiating these use cases by appropriate naming is, IMO, worth the effort of choosing a meaningful name. Even if the counter is not used inside the loop's body it's still in control of the whole loop Not in Python it's not. The values that come out of the iterator aren't in control of the loop. The state for the loop is in the *iterator*, not the values that come out. Having access to the values that come from the iterator is usually useful, but regardless of whether one uses them or not, they're *not* controlling the loop, and it's confusing to imply that they are. I agree that in control was incorrect phrase. So, when not using the values that come from the controlling iterator, it's good to make that explicit. If Python supported it, we might prefer to use no name at all for something that isn't used, but the 'for' syntax doesn't allow that. In the absence of supporting syntax, the next best thing is to choose a name that *does* make it explicit that the values will not be used. Name 'i' does not imply whether it's used inside the loop or not. IMO it perfectly covers both cases. It may have small advantage to make it explicit that the values will not be used, but names like dummy, unused, ignored or junk can be confusing for some people and break the established conventions for counter variable names (and these conventions are reasonable and are taken from mathematics). i is still the best choice. And let's agree to disagree. It's clear that we have different opinions and it looks that this discussion is not going to change them. -- Ivan -- http://mail.python.org/mailman/listinfo/python-list
Re: do you fail at FizzBuzz? simple prog test
On May 11, 3:12 am, globalrev [EMAIL PROTECTED] wrote: http://reddit.com/r/programming/info/18td4/comments claims people take a lot of time to write a simple program like this: Write a program that prints the numbers from 1 to 100. But for multiples of three print Fizz instead of the number and for the multiples of five print Buzz. For numbers which are multiples of both three and five print FizzBuzz. for i in range(1,101): if i%3 == 0 and i%5 != 0: print Fizz elif i%5 == 0 and i%3 != 0: print Buzz elif i%5 == 0 and i%3 == 0: print FizzBuzz else: print i is there a better way than my solution? is mine ok? personally if you're just checking if a modulus result is 0 or not I would rather do as it looks neat imho. for i in xrange(1,101): if not i % 3 and i % 5: print 'Fizz' elif i % 3 and not i % 5: print 'Buzz' elif not i % 3 and not i % 5: print 'FizzBuzz' else: print i -- http://mail.python.org/mailman/listinfo/python-list
artificiall, agent, movement
hi i'm working on some simulation project . i'm going to simulate traffic of a city. this simulation has cars , passengers , non-movable objects and Traffic signals . i've made cars as intelligent agent . it has thinking method , changing states agents ... the main problem is i have problem to move my agents in world . it would be possible to add some method to agent which move agent in random destination . but i'm trying to find some patterns which is designed for this problems . is there any sample source code in python or links, docs to help me ? thanks for your attention . -- http://mail.python.org/mailman/listinfo/python-list
Re: anonymous assignment
En Mon, 12 May 2008 06:45:40 -0300, Michele Simionato [EMAIL PROTECTED] escribió: On May 12, 4:28 am, Yves Dorfsman [EMAIL PROTECTED] wrote: there's got to be a better way than: d = time.local() y = d[0] d = d[1] Uses Python 2.6! ;) Python 2.6a3 (r26a3:62861, May 12 2008, 11:41:56) [GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2 Type help, copyright, credits or license for more information. import time time.localtime() time.struct_time(tm_year=2008, tm_mon=5, tm_mday=12, tm_hour=11, tm_min=43, tm_sec=47, tm_wday=0, tm_yday=133, tm_isdst=1) t=time.localtime() t.tm_year, t.tm_mday (2008, 12) No need of 2.6 - the above code works since Python 2.2 at least: Python 2.2.3 (#42, May 30 2003, 18:12:08) [MSC 32 bit (Intel)] on win32 Type help, copyright, credits or license for more information. import time t=time.localtime() type(t) type 'time.struct_time' t.tm_year 2008 (but struct_time objects were printed as regular tuples) -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Import/Create module from buffer
En Mon, 12 May 2008 05:49:22 -0300, Gruik [EMAIL PROTECTED] escribió: I'm currently working on python embedding with C++. My goal is that the C++ part handle files writing/reading so that the Python part only works with buffers. I succeeded in buffer exchanges. The problem is that some of the files I read/write are python files so that, before embedding, I imported them as modules when I needed them. But now that the Python part only receive buffers, I can't do it anymore. So I wonder : - is it possible to import module from a buffer instead of files? - or is it possible to create a module object from my buffer? Yes, first compile the buffer to get a code object, then use PyImport_ExecCodeModule. See how this function is used in import.c -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: python without while and other explosive statements
thanks for the tips, pam limits and http://codepad.org/ are both interesting tracks. Ivo 2008/5/12 Matt Nordhoff [EMAIL PROTECTED]: ivo talvet wrote: Hello, Is it possible to have a python which not handle the execution of while, for, and other loop statements ? I would like to allow remote execution of python on a public irc channel, so i'm looking for techniques which would do so people won't be able to crash my computer (while 1: os.fork(1)), or at least won't won't freeze my python in a infinite loop, make it unresponsive. Is there a compiling option (or better, something i can get with apt-get cos i think compiling myself and handle all the metastuff myself is somehow dirty) for have a secure python (you can guess what i mean by secure in my case) or must i touch myself the source disable some code lines ? If last solution, which modifications in which files should i do ? (sorry for my bad english) Thanks. Ivo http://codepad.org/ is a pastebin-like website that lets people upload code in a dozen different languages, and it runs it. They have info up about how it's secure at http://codepad.org/about. I'm pretty sure there's another similar website that's specific to Python, but I can't remember it. Anyway, it was similar, using virtual machines, a firewall, and killing stuff that ran for longer than 20 seconds, IIRC. (Thanks for the link to codepad, habnabit.) -- -- http://mail.python.org/mailman/listinfo/python-list
Re: Import/Create module from buffer
On May 12, 12:31 pm, Gabriel Genellina [EMAIL PROTECTED] wrote: En Mon, 12 May 2008 05:49:22 -0300, Gruik [EMAIL PROTECTED] escribió: I'm currently working on python embedding with C++. My goal is that the C++ part handle files writing/reading so that the Python part only works with buffers. I succeeded in buffer exchanges. The problem is that some of the files I read/write are python files so that, before embedding, I imported them as modules when I needed them. But now that the Python part only receive buffers, I can't do it anymore. So I wonder : - is it possible to import module from a buffer instead of files? - or is it possible to create a module object from my buffer? Yes, first compile the buffer to get a code object, then use PyImport_ExecCodeModule. See how this function is used in import.c -- Gabriel Genellina Thanks for your quick answer ! I think I'll have no problem with that in C++ and I'm going to try it right after this message. But before that 1 question: what if I'm in Python ? Following your solution, I did that in Python : def load_buffer(buffer) : compiled_buffer = compile(buffer, module_name, exec) exec(compiled_buffer) It works great except that I can't have a module object and that it is as if I did from module import * But I need the module object and not an import * behavior. Any idea about the way to do that? Benjamin -- http://mail.python.org/mailman/listinfo/python-list
Re: Import/Create module from buffer
Gruik wrote: But before that 1 question: what if I'm in Python ? Following your solution, I did that in Python : def load_buffer(buffer) : compiled_buffer = compile(buffer, module_name, exec) exec(compiled_buffer) It works great except that I can't have a module object and that it is as if I did from module import * But I need the module object and not an import * behavior. Any idea about the way to do that? Something along the lines of: import new mymodule = new.module(mymodule) exec code in mymodule.__dict__ --irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: do you fail at FizzBuzz? simple prog test
Ivan Illarionov [EMAIL PROTECTED] wrote:
is there a better way than my solution? is mine ok?
['%s%s' % (not i%3 and 'Fizz' or '', not i%5 and 'Buzz' or '')
or str(i) for i in xrange(1, 101)]
-- Ivan
or, more correctly, if you actually need to print:
sys.stdout.write('\n'.join('%s%s' %
(not i%3 and 'Fizz' or '', not i%5 aBuzz' or '')
or str(i)
for i in xrange(1, 101)))
I think the variant I came up with is a bit clearer:
for i in range(1,101):
print '%s%s' % ('' if i%3 else 'Fizz', '' if i%5 else 'Buzz') or i
--
http://mail.python.org/mailman/listinfo/python-list
Re: do you fail at FizzBuzz? simple prog test
Duncan Booth wrote:
Ivan Illarionov [EMAIL PROTECTED] wrote:
is there a better way than my solution? is mine ok?
['%s%s' % (not i%3 and 'Fizz' or '', not i%5 and 'Buzz' or '')
or str(i) for i in xrange(1, 101)]
-- Ivan
or, more correctly, if you actually need to print:
sys.stdout.write('\n'.join('%s%s' %
(not i%3 and 'Fizz' or '', not i%5 aBuzz' or '')
or str(i)
for i in xrange(1, 101)))
I think the variant I came up with is a bit clearer:
for i in range(1,101):
print '%s%s' % ('' if i%3 else 'Fizz', '' if i%5 else 'Buzz') or i
More than a bit clearer, IMO. How about
print ('' if i%3 else 'Fizz') + ('' if i%5 else 'Buzz') or i
(or perhaps
print (('' if i%3 else 'Fizz') + ('' if i%5 else 'Buzz')) or i
to save looking up the precedence rules) ?
--
http://mail.python.org/mailman/listinfo/python-list
Re: Module python-magic on/for Windows?
Michael Torrie wrote: In this case I'd try making a folder in the Python25 folder called share and put the contents of the gnuwin32 share/file stuff in there. Should look something like this: c:/python25/share/file/magic.mime.mgc c:/python25/share/file/magic c:/python25/share/file/magic.mgc c:/python25/share/file/magic.mime I used linux's strace command to trace the file calls of file.exe via wine (fun!) and verified that magic1.dll indeed will first in c:/progra~1/File/share/file/magic and then in ../share/file -- http://mail.python.org/mailman/listinfo/python-list
Re: Module python-magic on/for Windows?
Larry Hale wrote: Alternately, if one wishes to leave/place the magic files elsewhere, do like: test = magic.Magic( magic_file = 'C:\\Program Files\\GnuWin32\ \share\\file\\magic' ) # -- spec where/what the file is NOTE: Even if the magic_file location *is* specified, mime = True still works fine. (Haven't checked, but I presume the source simply tacks .mime to the filename automagically.) Obviously/also, one needn't specify the argument names if one uses proper argument order: magic.Magic( mime, magic_file ) :) THANKS SO MUCH, Michael, for your answers and helping me alone the way... :) Glad it's working for you. -- http://mail.python.org/mailman/listinfo/python-list
Re: do you fail at FizzBuzz? simple prog test
On May 12, 1:30 pm, John Machin [EMAIL PROTECTED] wrote:
Duncan Booth wrote:
[...]
I think the variant I came up with is a bit clearer:
for i in range(1,101):
print '%s%s' % ('' if i%3 else 'Fizz', '' if i%5 else 'Buzz') or i
More than a bit clearer, IMO. How about
print ('' if i%3 else 'Fizz') + ('' if i%5 else 'Buzz') or i
(or perhaps
print (('' if i%3 else 'Fizz') + ('' if i%5 else 'Buzz')) or i
to save looking up the precedence rules) ?
Stuff clarity! How about
for i in xrange(1, 101):
print 'FizzBuzz'[4*(i%30):4+4*(i%51)] or i
--
Arnaud
--
http://mail.python.org/mailman/listinfo/python-list
Re: Saving an audio file's waveform into an image
I am using Snack to process the audio signal of a rc transmitter. Look at http://www.speech.kth.se/snack/ Another audio processing: PortAudio and the Python module PyAudio. Look at http://people.csail.mit.edu/hubert/pyaudio/ Robert Julien wrote: Hi, I would like to pull out the waveform of an audio file and save it into an image file, for example in GIF format. Is that achievable, and if so, how? I heard about the Snack module, but the project looks dead and un- maintained. Your advice would be greatly appreciated. Thanks! Julien -- http://mail.python.org/mailman/listinfo/python-list
Re: anonymous assignment
Yves Dorfsman [EMAIL PROTECTED] writes: D'Arcy J.M. Cain wrote: On Mon, 12 May 2008 02:28:13 GMT Yves Dorfsman [EMAIL PROTECTED] wrote: particular case, there's got to be a better way than: d = time.local() y = d[0] d = d[1] Like this? y, d = time.local()[:2] Sorry this was a typo (again :-), I meant: d = time.local() y = d[0] d = d[2] Yves. http://www.SollerS.ca or .localtime()? or is this local() specific to a different python version? -- http://mail.python.org/mailman/listinfo/python-list
Re: Import/Create module from buffer
On May 12, 1:48 pm, Irmen de Jong [EMAIL PROTECTED] wrote: Gruik wrote: But before that 1 question: what if I'm in Python ? Following your solution, I did that in Python : def load_buffer(buffer) : compiled_buffer = compile(buffer, module_name, exec) exec(compiled_buffer) It works great except that I can't have a module object and that it is as if I did from module import * But I need the module object and not an import * behavior. Any idea about the way to do that? Something along the lines of: import new mymodule = new.module(mymodule) exec code in mymodule.__dict__ --irmen Yeah it works ! exec(compiled_module, globals(), mymodule.__dict__) Just to add mymodule to sys.modules and it's good! Thanks again Benjamin -- http://mail.python.org/mailman/listinfo/python-list
Re: Initializing a subclass with a super object?
On May 11, 3:19 am, Francesco Bochicchio [EMAIL PROTECTED] wrote: But there is not such a thing, in Python. What you have is that A has the same attributes/methods of B plus its own. What you could do is adding in class A a method like this: class A(B): ... def set_b_attributes(self, instance_of_b): for k, value in instance_of_b.__dict__: setattr(self, k, value ) and the use it like this: a1.set_b_attributes(b1) Hi, Francesco. Thanx! That's actually exactly what I needed (though I didn't know it). -- http://mail.python.org/mailman/listinfo/python-list
Re: do you fail at FizzBuzz? simple prog test
Arnaud Delobelle [EMAIL PROTECTED] wrote:
On May 12, 1:30 pm, John Machin [EMAIL PROTECTED] wrote:
Duncan Booth wrote:
[...]
I think the variant I came up with is a bit clearer:
for i in range(1,101):
print '%s%s' % ('' if i%3 else 'Fizz', '' if i%5 else
'Buzz') or
i
More than a bit clearer, IMO. How about
print ('' if i%3 else 'Fizz') + ('' if i%5 else 'Buzz') or
i (or perhaps
print (('' if i%3 else 'Fizz') + ('' if i%5 else 'Buzz'))
or i to save looking up the precedence rules) ?
Stuff clarity! How about
for i in xrange(1, 101):
print 'FizzBuzz'[4*(i%30):4+4*(i%51)] or i
--
Arnaud
--
http://mail.python.org/mailman/listinfo/python-list
With no loop:
i=1
execprint'FizzBuzz'[4*(i%30):4+4*(i%51)]or i;i+=1;*100
max
--
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Re: Now what!?
notbob wrote: frustrated and give up on learning programming, not really caring much for coding, anyway. But, dammit, I'm gonna stick with it this time. I'll learn python if it kills me! No, it won't kill you but make you stronger ;) -- http://mail.python.org/mailman/listinfo/python-list
Re: artificiall, agent, movement
Many city travel surveys collect source destination trip-start data; you might be able to find one of these studies. I think each car in your simulation should have a destination. Then the simulation needs a route-finder, and cars can progress along their routes as traffic permits -- or even change routes if traffic seems too slow. I think if you start with a very small city -- perhaps just a 5 by 5 grid, and generate sources and destinations at intersections randomly along the perimeter, you'll have enough to prototype all of the building blocks. Gerry On May 12, 6:37 am, Iman [EMAIL PROTECTED] wrote: hi i'm working on some simulation project . i'm going to simulate traffic of a city. this simulation has cars , passengers , non-movable objects and Traffic signals . i've made cars as intelligent agent . it has thinking method , changing states agents ... the main problem is i have problem to move my agents in world . it would be possible to add some method to agent which move agent in random destination . but i'm trying to find some patterns which is designed for this problems . is there any sample source code in python or links, docs to help me ? thanks for your attention . -- http://mail.python.org/mailman/listinfo/python-list
execfile python3k
Hi there,
Since execfile() is removed in Python 3.0
I have question about using exec.
I know about
exec(open('filename').read())
but from documentation the 1st arg of exec can be 'file object'.
However
exec(open('filename'))
does not work.
Does anybody have idea how to construct 'file object' then?
Thanks,
--
http://mail.python.org/mailman/listinfo/python-list
Re: artificiall, agent, movement
On May 12, 5:37 am, Iman [EMAIL PROTECTED] wrote: is there any sample source code in python or links, docs to help me ? thanks for your attention . I've used SimPy in the past to implement a factory simulation. The SimPy web site claims that it has been used for traffic simulation, but does not give any links. http://simpy.sourceforge.net/index.html I found it to be a very neat discrete event simulator, making good use of Python language features (especially generators). HTH, -- Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Mathematics in Python are not correct
On May 12, 2:09 am, Terry Reedy [EMAIL PROTECTED] wrote: Then it seems equally dubious that 0.**y, y0, should be well-defined. It seems to me that lim as x goes to 0. exp(y*log(x)) is equally well defined whether y is 0 or not, even though there is a discontinuity in the limit. Well, there's a difference: the limit of exp(y*log(x)) as (x, y) - (0, a) exists for all finite nonzero a. The limit as (x, y) - (0, 0) doesn't. 2.5 raises an exception. In 3.0, (-2)**1. (3.999722741113-1.2566370355167477e-07j) Interesting---I hadn't realised that 3.0 had changed this. I can't quite decide whether I like this behaviour much. It seems to be the only case where a computation involving only floats can produce a complex number. | Incidentally, the decimal module is slightly schizophrenic about this: That module follows the IBM-led standard, no matter how crazy. Yeah---I know. :-). The current decimal __pow__ code is mostly my fault, at least in 2.5.2/2.6/3.0 onwards. For what it's worth, the author of the Decimal standard has indicated that the behaviour of 0**0 might change after IEEE 754r finally sees the light of day. Mark -- http://mail.python.org/mailman/listinfo/python-list
Compiling Python using Microsoft Visual C++ 2008
1.I have both 2.5 and 2.6 but both appear, under Recent Projects, as pcbuild. It would be helpful if the Python Version could be indicated. 2.With 2.6, Python compiles and executes OK but various packages are not compiled, eg sqlite3. 3.Pythonw compiles OK but not sqlite3. 4.Mike Fletcher suggests an approach (http://www.vrplumber.com/programming/mstoolkit/) with Visual C for Python 2.4. Is this still the recommended way to compile Python 2.6? 5.Python 2.5 source refers to an Older Visual C. Automatic conversion to Visual C 2008 gives the message “Some of the properties associated with the solution could not be read.” All projects except one had a single warning, there were no errors reported. 6.After conversion there is no python project, it is flagged “unavailable”. 7.Pythoncore builds with no errors and 6 warnings but there is no executable. 8.Python 2.5 build _tkinter fails – tcl.h not found. I would welcom advice on how to proceed. Colin W. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is using range() in for loops really Pythonic?
On 2008-05-12, Ben Finney [EMAIL PROTECTED] wrote: Maybe my brain works differently, but I find both dummy and unused are extremely confusing names for loop counters. The loop begins to look like it doesn't iterate at all if its counter is dummy or unused. If it *counts* it is *used* and it's *not* dummy. The value is unused by any of the code inside the block. For the purposes of that block, it is a dummy value. The value may be unused, but for me it's the name that matters, not the value. The name might be in use by other code, and the careless choice of a dummy name that's _supposed_ to be unused has broken code precisely becuase the name was being used (for something else). Requiring that the user pollute a namespace with a useless name is a wart. That is also regrettably common in Python code. It still suffers from being unnecessarily ambiguous, since there are *also* plenty of loops using 'i', 'j', etc. where the loop counter *is* used. Perhaps I'm the only one who's ever been stupid enough to overwrite an index named i (that is being used) with another index named i (that isn't being used)... -- Grant Edwards grante Yow! All of life is a blur at of Republicans and meat! visi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: frameword vs application server?
walterbyrd schrieb: Can somebody help me understand the difference? Not just where Python is concerned, but in general? As I understand it, an application server is supposed to be a great help in developing apps, because most of the business logic is already there. It seems to me that, usually when applications servers are discussed, people are talking about Java. First of all, this is a misconception. An app-server may provide a wide range of infrastructure, however this has nothing to do with business logic. THat can merely pick parts of that infrastructure to build upon. But the distinction to a powerful framework is slim enough. And it should be (and has been often so) said that especially in the java-world, app-servers and the specifications the implement (j2ee) are over-engineered and complicated. I suppose most popular Python frameworks incorporate an application server, but I get the idea that those app servers are not nearly as sophisticed as something like JBoss. The sophistication is a matter of perspective - some of it stems from the fact that in java, you need a lot more code to make even pretty simple things work. Think of delegation to business objects (session beans) that get their respective calls wrapped so that they take place inside a transactional context. Which involves a great deal of design-abstractions, code-generators and tons of XML to glue these together. Or three lines of code in python... I am not sure if a Python app server, that works like a Java app server would make sense. As mentioned above - in some aspects, that is not really needed. But if you want more of an app-server, have a look at ZOPE, Kamaelia and maybe even twisted. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Compiling Python using Microsoft Visual C++ 2008
1.I have both 2.5 and 2.6 but both appear, under Recent Projects, as pcbuild. It would be helpful if the Python Version could be indicated. Hover over the link, and it will display the full path, which you can then infer to reason about the specific copy of Python you are using. In any case, compiling Python 2.5 with VS 2008 is not supported. 2.With 2.6, Python compiles and executes OK but various packages are not compiled, eg sqlite3. See PCbuild/readme.txt. 3.Pythonw compiles OK but not sqlite3. So what's the error? 4.Mike Fletcher suggests an approach (http://www.vrplumber.com/programming/mstoolkit/) with Visual C for Python 2.4. Is this still the recommended way to compile Python 2.6? No. Either use the full product, or the express edition. Neither requires and additional setup. 5.Python 2.5 source refers to an Older Visual C. Automatic conversion to Visual C 2008 gives the message “Some of the properties associated with the solution could not be read.” All projects except one had a single warning, there were no errors reported. 6.After conversion there is no python project, it is flagged “unavailable”. See above. This procedure is not supported; you are on your own. Get a copy of VS 2003 if you want to follow the official recommendations. 7.Pythoncore builds with no errors and 6 warnings but there is no executable. 8.Python 2.5 build _tkinter fails – tcl.h not found. See PCbuild/readme.txt. Regards, Martin -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there no single/uniform RDBMS access API module for Python ?
On Mon, May 12, 2008 at 1:45 AM, Banibrata Dutta [EMAIL PROTECTED] wrote: Based on this URL http://wiki.python.org/moin/DatabaseInterfaces , is it correct to conclude that there is no RDBMS agnostic, single/uniform DB access API for Python ? Something in the lines of JDBC for Java, DBD for Perl etc. ? How is the RDBMS change handled for solutions which need to work with different RDBMSs ?? http://www.python.org/dev/peps/pep-0249/ That appears to be only an API specification. Are there any implementations of that ? You might want to take a look at Dabo (http://dabodev.com). They have a backend-agnostic interface for working with different databases. I don't do database apps myself, so I can't comment on how well it works, but based on the comments of others on the Dabo email lists, it seems as though it works well enough. -- # p.d. -- http://mail.python.org/mailman/listinfo/python-list
Removing option from optparse
Hello,
I'm trying to figure out if the following is a bug or if I'm using the
remove_option in the wrong way.
#!/usr/bin/env python
import optparse
parser = optparse.OptionParser()
parser.add_option(--test, help=This is a test option)
parser.remove_option('--test')
print parser.parse_args()
this will output:
(Values at 0x6beb8: {'test': None}, [])
If you execute the --help on the file above you will not see --test as
expected. I'm curious as to why parse_args is still returning this as
an option.
Thanks,
Gustavo
--
http://mail.python.org/mailman/listinfo/python-list
Re: Is using range() in for loops really Pythonic?
On 2008-05-12, Ben Finney [EMAIL PROTECTED] wrote: I too, agree that requiring a name be bound to the values coming out of the iterator seems wrong. With do something N times, there must be *something* to keep track of which iteration we're up to (or, equivalently, how many iterations remain) at a given moment. A Python iterator seems a fine choice to hold that information, and better than many alternatives. An iterator like xrange() is an excellent choice. But, since the iterator contains that information, why require that that value be exported by the iterator and bound to an externally visible name? In the case in question, the only thing you need from the iterator is the StopIteration exception. To me, exposing the internal state of the iterator and requiring that the user bind a name to it each time through the loop feels we're like driving a nail with a screwdriver. -- Grant Edwards grante Yow! Was my SOY LOAF left at out in th'RAIN? It tastes visi.comREAL GOOD!! -- http://mail.python.org/mailman/listinfo/python-list
Re: Is using range() in for loops really Pythonic?
On 2008-05-12, Ben Finney [EMAIL PROTECTED] wrote: Paddy [EMAIL PROTECTED] writes: I've used Fortran and C and so would tend to use either i,j,k as the unused loop variable above, or, for clarity, call it something descriptive like loop_count, if the loop body would be clearer. The problem with all of these names is that they also have long precedent as names of values that *will* be used inside the loop. I guess people who standardize on loop_count never nest loops. :) Because of the precedent of those names, choosing one of those names doesn't make it clear to the reader that the value is never used; they have no indication from you of that until they look over the code a few times. It's implicit rather than explicit. And when somebody adds a nested loop things fall apart. -- Grant Edwards grante Yow! BARBARA STANWYCK makes at me nervous!! visi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Removing option from optparse
[EMAIL PROTECTED] schrieb:
Hello,
I'm trying to figure out if the following is a bug or if I'm using the
remove_option in the wrong way.
#!/usr/bin/env python
import optparse
parser = optparse.OptionParser()
parser.add_option(--test, help=This is a test option)
parser.remove_option('--test')
print parser.parse_args()
this will output:
(Values at 0x6beb8: {'test': None}, [])
If you execute the --help on the file above you will not see --test as
expected. I'm curious as to why parse_args is still returning this as
an option.
I'm guessing here - but it is *one* thing to disable an option for the
user because of whatever condition, and another to remove the options
default value that code could possibly rely on to work. So I'd say the
behavior is sane.
Diez
--
http://mail.python.org/mailman/listinfo/python-list
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Re: Compiling Python using Microsoft Visual C++ 2008
Martin v. Löwis wrote: 1.I have both 2.5 and 2.6 but both appear, under Recent Projects, as pcbuild. It would be helpful if the Python Version could be indicated. Hover over the link, and it will display the full path, which you can then infer to reason about the specific copy of Python you are using. Lovely, thanks. It's at the bottom of the screen. In any case, compiling Python 2.5 with VS 2008 is not supported. 2.With 2.6, Python compiles and executes OK but various packages are not compiled, eg sqlite3. See PCbuild/readme.txt. I presume that this is PCbuild8.txt 3.Pythonw compiles OK but not sqlite3. So what's the error? 4.Mike Fletcher suggests an approach (http://www.vrplumber.com/programming/mstoolkit/) with Visual C for Python 2.4. Is this still the recommended way to compile Python 2.6? No. Either use the full product, or the express edition. Neither requires and additional setup. 5.Python 2.5 source refers to an Older Visual C. Automatic conversion to Visual C 2008 gives the message “Some of the properties associated with the solution could not be read.” All projects except one had a single warning, there were no errors reported. 6.After conversion there is no python project, it is flagged “unavailable”. See above. This procedure is not supported; you are on your own. Get a copy of VS 2003 if you want to follow the official recommendations. 7.Pythoncore builds with no errors and 6 warnings but there is no executable. 8.Python 2.5 build _tkinter fails – tcl.h not found. See PCbuild/readme.txt. Regards, Martin Thanks. I'll look at the readme more carefully and seek VS 2003. Now, I would like to remove Python 2.5 from VS 2008 but see no obvious way of getting rid of it. Colin W. -- http://mail.python.org/mailman/listinfo/python-list
buffering choking sys.stdin.readlines() ?
Newbie question: I'm trying to turn a large XML file (~7G compressed) into a YAML file, and my program seems to be buffering the input. IOtest.py is just import sys for line in sys.stdin.readlines(): print line but when I run $ gzcat bigXMLfile.gz | IOtest.py but it hangs then dies. The goal of the program is to build a YAML file with print statements, rather than building a gigantic nested dictionary, but I am obviously doing something wrong in passing input through without buffering. Any advice gratefully fielded. -clay -- http://mail.python.org/mailman/listinfo/python-list
Re: Write a python blog/website?
2008/5/9 Sumon Sadhu [EMAIL PROTECTED]: Hey Dotan, My apologies if this post caused offense. Your assertion is right, maybe i should have emailed everyone individually like i've done with the first 45 sites, but it was never my intention to spam. Sumon, I think that you do not understand the perception of spam in technological circles. Today, there is no way to initiate contact with a business offer via email. None. All email solicitations are unwelcome. I tell you this to help you. I do not know if you receive 5000 spam messages a week like I receive, but know that a sizeable portion of the Python list gets considerably more. These people hate spam. We're programmers like yourself, trying to build something that provides a lot of benefit. You can see our intentions are genuine (and our python ad server was fun to build) Actually, I am not a programmer by trade. I learn python for fun while I study mechanical engineering. I read the python list for the wisdom that passes, and rarely post. So while i appreciate your response, it was never my attention to be spammy I recognized that from the beginning, and stated that in my original post. Which should have been kept private between us, now I realize. Dotan Cohen http://what-is-what.com http://gibberish.co.il א-ב-ג-ד-ה-ו-ז-ח-ט-י-ך-כ-ל-ם-מ-ן-נ-ס-ע-ף-פ-ץ-צ-ק-ר-ש-ת A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? -- http://mail.python.org/mailman/listinfo/python-list
RE: do you fail at FizzBuzz? simple prog test
Mensanator wrote: Ok, I agree with 101, but I wouldn't necessarily say the others were unfortunate. You might be surprised at how often such fixations discover bugs, something that I have a gift for. The discovering, the making, or both? ;) Tim Delaney -- http://mail.python.org/mailman/listinfo/python-list
Re: Mathematics in Python are not correct
On 12 May, 15:21, Mark Dickinson [EMAIL PROTECTED] wrote: On May 12, 2:09 am, Terry Reedy [EMAIL PROTECTED] wrote: Then it seems equally dubious that 0.**y, y0, should be well-defined. It seems to me that lim as x goes to 0. exp(y*log(x)) is equally well defined whether y is 0 or not, even though there is a discontinuity in the limit. Well, there's a difference: the limit of exp(y*log(x)) as (x, y) - (0, a) exists for all finite nonzero a. The limit as (x, y) - (0, 0) doesn't. But exp(y*log(x)) - 1 as (x, y) - (0, 0) along any analytic curve which is not the x=0 axis (I think at least - it seems easy to prove that given f and g analytic over R, f(x)*ln g(x) - 0 as x - 0 if f(0)=g(0)=0 and g(x)0 in the neighbourhood of 0). This should cover most practical uses? -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: Is using range() in for loops really Pythonic?
On May 12, 3:46 pm, Grant Edwards [EMAIL PROTECTED] wrote: On 2008-05-12, Ben Finney [EMAIL PROTECTED] wrote: Paddy [EMAIL PROTECTED] writes: I've used Fortran and C and so would tend to use either i,j,k as the unused loop variable above, or, for clarity, call it something descriptive like loop_count, if the loop body would be clearer. The problem with all of these names is that they also have long precedent as names of values that *will* be used inside the loop. I guess people who standardize on loop_count never nest loops. :) Because of the precedent of those names, choosing one of those names doesn't make it clear to the reader that the value is never used; they have no indication from you of that until they look over the code a few times. It's implicit rather than explicit. And when somebody adds a nested loop things fall apart. I don't have an example to hand. A lot of casses of repeat_X_times inside a loop of repeat_Y_times would naturally be written as repeat_Y*X_times. Oh, wait a bit, oversimplified_example_alert for i in range(3): print Stay! for j in range(2): print Come over. /oversimplified_example_alert Which could become: for outer_stay_repetions in range(3): print Stay! for inner_come_over_repetions in range(2): print Come over. But the second is daft. Nested repeats don't neccessarily pose a problem to choosing meaningful names for repeat counters that are not going to be referenced in the loop body, and most times i,j,k are fine for used and un-used loop indices I find. - Paddy (Or were you just having a laugh ;-) -- http://mail.python.org/mailman/listinfo/python-list
Re: buffering choking sys.stdin.readlines() ?
On Mon, 12 May 2008 08:05:39 -0700 (PDT), cshirky [EMAIL PROTECTED] wrote: Newbie question: I'm trying to turn a large XML file (~7G compressed) into a YAML file, and my program seems to be buffering the input. IOtest.py is just import sys for line in sys.stdin.readlines(): print line but when I run $ gzcat bigXMLfile.gz | IOtest.py but it hangs then dies. file.readlines reads the entire file into a list in memory. You may not want to do this. You could try, instead, iterating over sys.stdin, which should not try to load the entire file into memory. Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: buffering choking sys.stdin.readlines() ?
cshirky schrieb: Newbie question: I'm trying to turn a large XML file (~7G compressed) into a YAML file, and my program seems to be buffering the input. IOtest.py is just import sys for line in sys.stdin.readlines(): print line but when I run $ gzcat bigXMLfile.gz | IOtest.py but it hangs then dies. The goal of the program is to build a YAML file with print statements, rather than building a gigantic nested dictionary, but I am obviously doing something wrong in passing input through without buffering. Any advice gratefully fielded. readlines() reads all of the file into the memory. Try using xreadlines, the generator-version, instead. And I'm not 100% sure, but I *think* doing for line in sys.stdin: ... does exactly that. Diez -- http://mail.python.org/mailman/listinfo/python-list
Socket and cycle problem
Hello, I am beginner but so I need help. I have small script for receive data from port 3883, but it print only once. import socket HOST = 'localhost' PORT = 3883 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((HOST, PORT)) data = s.recv(2048) s.close() print 'receive data from server:', `data` So I try to write cycle to this script, like this: import socket HOST = 'localhost' PORT = 3883 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) while 1: s.connect((HOST, PORT)) data = s.recv(2048) s.close() print 'receive data from server:', `data` But Python reporting: Traceback (most recent call last): File C:\Documents and Settings\poupa\Plocha\TCP3.py, line 7, in module s.connect((HOST, PORT)) File string, line 1, in connect File C:\Python25\lib\socket.py, line 141, in _dummy raise error(EBADF, 'Bad file descriptor') error: (9, 'Bad file descriptor') Where is the mistake? I dont know. thaks for help Petr -- http://mail.python.org/mailman/listinfo/python-list
Re: do you fail at FizzBuzz? simple prog test
On May 12, 1:59 pm, Arnaud Delobelle [EMAIL PROTECTED] wrote:
On May 12, 1:30 pm, John Machin [EMAIL PROTECTED] wrote:
Duncan Booth wrote:
[...]
I think the variant I came up with is a bit clearer:
for i in range(1,101):
print '%s%s' % ('' if i%3 else 'Fizz', '' if i%5 else 'Buzz') or i
More than a bit clearer, IMO. How about
print ('' if i%3 else 'Fizz') + ('' if i%5 else 'Buzz') or i
(or perhaps
print (('' if i%3 else 'Fizz') + ('' if i%5 else 'Buzz')) or i
to save looking up the precedence rules) ?
Stuff clarity! How about
for i in xrange(1, 101):
print 'FizzBuzz'[4*(i%30):4+4*(i%51)] or i
for i in xrange(1, 101):
print 'Fizz'*(i%31)+'Buzz'*(i%51) or i
--
Paul Hankin
--
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Re: Mathematics in Python are not correct
In article [EMAIL PROTECTED], [EMAIL PROTECTED] wrote: I am stunned that this simple misunderstanding of mine ended in a mathematical clash of a sort. :) You guys really blew me away wih your mathematical knowledge. And also the 0**0 is a thing I've never thought about trying, until now that is. If the mathematical rule is that EVERYTHING raised to the power of 0 is 1, then we should accept that, even in the case of 0**0. This is just the way it is. Well, it's really not that simple. You've seen that 0**0 can lead to problems in various areas of mathematics (check the Wikipedia article on analysis/calculus application vs. combinatorics and discrete math). You have to be aware of those dangers, what the language (Python here), and what your application requires. Consistency in mathematics is vital. If you are using 0**0=1, then your code should be consistent with that usage. -- -- Lou Pecora -- http://mail.python.org/mailman/listinfo/python-list
Pydev 1.3.17 Released
Hi All, Pydev and Pydev Extensions 1.3.17 have been released Details on Pydev Extensions: http://www.fabioz.com/pydev Details on Pydev: http://pydev.sf.net Details on its development: http://pydev.blogspot.com Release Highlights in Pydev Extensions: - * Minor bug-fixes Release Highlights in Pydev: -- * Pydev Package Explorer: projects that had the project folder in the pythonpath did not show children items correctly. * Debugger: Disable all works. Patch from: Oldrich Jedlicka * Debugger: Problem when making a step return / step over * Code-completion: Working for attributes found in a superclass imported with a relative import Patches from Felix Schwarz: o Allow to configure an interpreter even if the workspace path name contains spaces o Completion server does not work when the eclipse directory contains spaces o Fix deletion of resources in pydev package explorer for Eclipse 3.4 What is PyDev? --- PyDev is a plugin that enables users to use Eclipse for Python and Jython development -- making Eclipse a first class Python IDE -- It comes with many goodies such as code completion, syntax highlighting, syntax analysis, refactor, debug and many others. Cheers, -- Fabio Zadrozny -- Software Developer ESSS - Engineering Simulation and Scientific Software http://www.esss.com.br Pydev Extensions http://www.fabioz.com/pydev Pydev - Python Development Enviroment for Eclipse http://pydev.sf.net http://pydev.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Mathematics in Python are not correct
In article [EMAIL PROTECTED], Terry Reedy [EMAIL PROTECTED] wrote: Mark Dickinson [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] On May 11, 9:36 pm, Terry Reedy [EMAIL PROTECTED] wrote: | Do you have in mind any situations in which it is advantageous to have 0**0 | undefined? | (Playing devil's advocate here.) If you regard x**y as exp(y*log(x)) Which, of course, I was not, but for the sake of discussion | then it's not at all clear that 0.**0. should be considered well-defined. Then it seems equally dubious that 0.**y, y0, should be well-defined. It seems to me that lim as x goes to 0. exp(y*log(x)) is equally well defined whether y is 0 or not, even though there is a discontinuity in the limit. Huh? That discontinuity is the problem. Actually, the problem is that the function f(x,y)=x**y=exp(y*ln(x)) will be double valued at x=0 and y=0. It's value will depend on the direction in which the limit approaches (x,y)=(0,0). You cannot have a function that has two values at one domain point without adding branch cuts (see complex functions like ln(z), z is complex). That's not well defined -- in your sense. You are choosing a branch cut and you must make sure the rest of your math and code are consistent with that. You should also tell any users of your code about that decision. -- -- Lou Pecora -- http://mail.python.org/mailman/listinfo/python-list
Re: Socket and cycle problem
On Mon, 12 May 2008 08:34:07 -0700 (PDT), [EMAIL PROTECTED] wrote: Hello, I am beginner but so I need help. I have small script for receive data from port 3883, but it print only once. import socket HOST = 'localhost' PORT = 3883 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((HOST, PORT)) data = s.recv(2048) s.close() print 'receive data from server:', `data` So I try to write cycle to this script, like this: import socket HOST = 'localhost' PORT = 3883 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) while 1: s.connect((HOST, PORT)) data = s.recv(2048) s.close() print 'receive data from server:', `data` But Python reporting: Traceback (most recent call last): File C:\Documents and Settings\poupa\Plocha\TCP3.py, line 7, in module s.connect((HOST, PORT)) File string, line 1, in connect File C:\Python25\lib\socket.py, line 141, in _dummy raise error(EBADF, 'Bad file descriptor') error: (9, 'Bad file descriptor') Where is the mistake? I dont know. You cannot reconnect a socket. You need to create a new one for each connection. It's also almost certainly the case that the way you are receiving data is incorrect. There is no guarantee that you will get 2048 bytes from socket.recv(2048). It isn't even guaranteed that all the bytes written to the socket by the peer will be returned by such a call. Instead, you need a framing protocol to determine when all data has been received. For example, you might length prefix the data, or you might insert a delimiter (or a terminator) at the end. Or if there is exactly one message to receive, then you should just read until the recv call returns '', indicating EOF. Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
In metaclass, when to use __new__ vs. __init__?
I have been experimenting with metaclasses lately. It seems possible to define a metaclass by either subclassing type and then either redefining __init__ or __new__. Here's the signature for __init__: def __init__(cls, name, bases, d): and here's __new__: def __new__(meta, classname, bases, d): Every metaclass I have found monkeys with d, which is available in both methods. So when is it better to use one vs the other? Thanks for the help. Matt -- Programming, life in Cleveland, growing vegetables, other stuff. http://blog.tplus1.com -- http://mail.python.org/mailman/listinfo/python-list
passing *args recursively
Hi, This must be very basic, but how'd you pass the same *args several levels deep? def func2(*args) print args # ((1, 2, 3),) # i want this to output (1, 2, 3) as func1! # there must be some better way than args[0]? def func1(*args): print args # (1, 2, 3) func2(args) func1(1,2,3) Thanks! Guillermo -- http://mail.python.org/mailman/listinfo/python-list
Re: Socket and cycle problem
On 12 Kvě, 17:54, Jean-Paul Calderone [EMAIL PROTECTED] wrote: On Mon, 12 May 2008 08:34:07 -0700 (PDT), [EMAIL PROTECTED] wrote: Hello, I am beginner but so I need help. I have small script for receive data from port 3883, but it print only once. import socket HOST = 'localhost' PORT = 3883 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((HOST, PORT)) data = s.recv(2048) s.close() print 'receive data from server:', `data` So I try to write cycle to this script, like this: import socket HOST = 'localhost' PORT = 3883 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) while 1: s.connect((HOST, PORT)) data = s.recv(2048) s.close() print 'receive data from server:', `data` But Python reporting: Traceback (most recent call last): File C:\Documents and Settings\poupa\Plocha\TCP3.py, line 7, in module s.connect((HOST, PORT)) File string, line 1, in connect File C:\Python25\lib\socket.py, line 141, in _dummy raise error(EBADF, 'Bad file descriptor') error: (9, 'Bad file descriptor') Where is the mistake? I dont know. You cannot reconnect a socket. You need to create a new one for each connection. It's also almost certainly the case that the way you are receiving data is incorrect. There is no guarantee that you will get 2048 bytes from socket.recv(2048). It isn't even guaranteed that all the bytes written to the socket by the peer will be returned by such a call. Instead, you need a framing protocol to determine when all data has been received. For example, you might length prefix the data, or you might insert a delimiter (or a terminator) at the end. Or if there is exactly one message to receive, then you should just read until the recv call returns '', indicating EOF. Jean-Paul ok thanks, but I am true greenhorn, so you think that the best way is write new script? Could you send me code if it isnt long, becase I have no idea and unfortunately time as well. Petr Petr -- http://mail.python.org/mailman/listinfo/python-list
Re: passing *args recursively
On Mon, May 12, 2008 at 12:19 PM, Guillermo [EMAIL PROTECTED] wrote: def func1(*args): print args # (1, 2, 3) func2(args) change this line to: func2(*args) -- Jerry -- http://mail.python.org/mailman/listinfo/python-list
Re: passing *args recursively
On May 12, 9:19 am, Guillermo [EMAIL PROTECTED] wrote: Hi, This must be very basic, but how'd you pass the same *args several levels deep? def func2(*args) print args # ((1, 2, 3),) # i want this to output (1, 2, 3) as func1! # there must be some better way than args[0]? def func1(*args): print args # (1, 2, 3) func2(args) func1(1,2,3) Thanks! Guillermo def func1(*args): print args func2(*args) # don't forget the '*' Matt -- http://mail.python.org/mailman/listinfo/python-list
Re: Compiling Python using Microsoft Visual C++ 2008
Colin J. Williams schrieb: See PCbuild/readme.txt. I presume that this is PCbuild8.txt No, it's PCbuild/readme.txt in Python 2.6 and 3.0 By the way you can call Tools\buildbot\external.bat from the root directory of the 2.6 and 3.0. It checks out and build the dependencies. The script requires the VS 9.0 tools and the svn command line executables. Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: Mathematics in Python are not correct
On May 12, 11:15 am, Arnaud Delobelle [EMAIL PROTECTED] wrote: But exp(y*log(x)) - 1 as (x, y) - (0, 0) along any analytic curve which is not the x=0 axis (I think at least - it seems easy to prove that given f and g analytic over R, f(x)*ln g(x) - 0 as x - 0 if f(0)=g(0)=0 and g(x)0 in the neighbourhood of 0). Agreed. And this makes an excellent argument that if you're going to choose a number for 0.0**0.0 then it's got to be 1. But I still don't find it completely convincing as an argument that 0.0**0.0 should be defined at all. This should cover most practical uses? Maybe. But if you're evaluating x**y in a situation where x and y represent physical quantities, or otherwise have some degree of error, then you probably want to be warned if x and y both turn out to be zero. I seem to be digging myself into a hole here. I'm personally firmly in the 0**0 should be 1 camp, and always have been--- there are just too many practical benefits to defining 0**0==1 to ignore, and in the case where you're interested in integer exponents anything else is just plain wrong. The lack of continuity of the power function at (0,0) seems a small price to pay. Mark -- http://mail.python.org/mailman/listinfo/python-list
Re: Python doesn't recognize quote types
On May 12, 8:31 am, Duncan Booth [EMAIL PROTECTED] wrote:
Dennis Lee Bieber [EMAIL PROTECTED] wrote:
The sloppy use of single quote for the apostrophe is unfortunate
G
True, but that problem is outside of the Python community's control. Given
that people do often refer to single quote when they mean apostrophe the
error message should be written so as to minimise confusion.
FYI, there are actually 2 types of quote character, single and double,
each with 2 forms, left and right. In Unicode the single-quote
characters are U+2018 (‘) and U+2019 (’) and the double-quote
characters are U+201C (“) and U+201D (”). The right-hand single-quote
is also the apostrophe.
In order to reduce the size of the character set needed, computer
manufacturers introduced 'sexless' quote characters, the single-quote/
aphostrophe U+0027 (') and double-quote U+0022 ().
--
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