Mailman 3 April 2008 - Python-Dev

cStringIO buffer interface
by Farshid Lashkari 30 Apr '08

30 Apr '08

Hello, I'm not sure if this is the right place to ask, so I apologize ahead of time if it is. I was just curious as to why cStringIO objects don't implement the buffer interface. cStringIO objects seem similar to string and array objects, and those support the buffer protocol. Is there a reason against allowing cStringIO to support at least the read buffer interface, or is just that nobody has considered it until now? Thanks, Farshid

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enhanced ioctl?
by Neal Becker 28 Apr '08

28 Apr '08

IIUC, current ioctl is not capable of handling arbitrary argument types. This code will allow any arg type (such as structures with pointers to embedded structures). The code for _IOC is taken from linux and might not be portable. from ctypes import * libc = CDLL ('/lib/libc.so.6') #print libc.ioctl def set_ioctl_argtype (arg_type): libc.ioctl.argtypes = (c_int, c_int, arg_type) _IOC_WRITE = 0x1 _IOC_NRBITS= 8 _IOC_TYPEBITS= 8 _IOC_SIZEBITS= 14 _IOC_DIRBITS= 2 _IOC_NRSHIFT= 0 _IOC_TYPESHIFT= (_IOC_NRSHIFT+_IOC_NRBITS) _IOC_SIZESHIFT= (_IOC_TYPESHIFT+_IOC_TYPEBITS) _IOC_DIRSHIFT= (_IOC_SIZESHIFT+_IOC_SIZEBITS) def _IOC (dir, type, nr, size): return (((dir) << _IOC_DIRSHIFT) | \ ((type) << _IOC_TYPESHIFT) | \ ((nr) << _IOC_NRSHIFT) | \ ((size) << _IOC_SIZESHIFT)) def ioctl (fd, request, args): return libc.ioctl (fd, request, args) ------------------- Example usage: from ioctl import * set_ioctl_argtype (POINTER (eos_dl_args_t)) EOS_IOC_MAGIC = 0xF4 request = _IOC(_IOC_WRITE, EOS_IOC_MAGIC, 0x00, 0) # ignore size err = ioctl (eos_file.fileno(), request, args)

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Dealing with a desired change to warnings.showwarning()
by Brett Cannon 28 Apr '08

28 Apr '08

As part of my rewrite of warnings into C, I added a new, optional argument to showwarning(): line, which defaults to None. As http://bugs.python.org/issue2705 points out, though, since the function has been documented as being allowed to be overridden, this potentially breaks existing showwarning() implementations. That means something needs to change. One option is to introduce a new function. But what to name it? show_warning()? That small of a name change seems like asking for trouble, but showwarning_ex() just seems wrong to use in Python code. Another is that where showwarning() is called within the code, if a TypeError is raised or introspection proves the call can't work, then to try again without the 'line' argument, and raise a deprecation warning. Or try to re-architect _warnings.c to not use the 'line' argument (although it is handy for testing purposes). Anyway, people have any suggestions? -Brett

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Is Py_WIN_WIDE_FILENAMES still alive?
by ocean 28 Apr '08

28 Apr '08

Hello. I noticed when I removes following line in trunk/PC/pyconfig.h #define Py_WIN_WIDE_FILENAMES _fileio.c and posixmodule.c (and maybe more) cannot be compiled on Windows. When Py_WIN_WIDE_FILENAMES is not defined, how should python behave? - call posix functions like open(2) - call ANSI Win32 APIs like MoveFileA Or maybe this macro is not used anymore? Thank you.

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Python 2.6a2 execution times with various compilers
by Jeroen Ruigrok van der Werven 28 Apr '08

28 Apr '08

I did some performance comparisons with various compilers and the resulting Python 2.6a2 and pybench. I put the details on http://www.in-nomine.org/2008/04/11/python-26a2-execution-times-with-variou… Of course, take benchmark results with a grain of salt, but it seems ICC can provide people with an added performance edge when using Python. In short: I measured a speedup between ~21%-29% with ICC compared to GCC. -- Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai イェルーンラウフロックヴァンデルウェルヴェン http://www.in-nomine.org/ | http://www.rangaku.org/ I was searching through the Heavens and somehow I slipped...

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Double specification of function signatures?
by skip＠pobox.com 28 Apr '08

28 Apr '08

While cleaning up the documentation for the tempfile module I noticed that the docstrings for the mk*temp functions in the module itself list their signatures (incompletely) in the first line. I don't know if that was intentional, but it seems both redundant and error-prone to me. The help() function already displays the signatures of Python functions. There's no need to put them in docstrings and risk having them out-of-date. For example: >>> help(tempfile.mkdtemp) Help on function mkdtemp in module tempfile: mkdtemp(suffix='', prefix='tmp', dir=None) mkdtemp([suffix, [prefix, [dir]]]) User-callable function to create and return a unique temporary directory. The return value is the pathname of the directory. Am I way off-base here? Let me know, as I have a couple minor tweaks to check in besides these. Thx, Skip

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PyErr_Py3kWarn
by Benjamin Peterson 27 Apr '08

27 Apr '08

I have a patch to to add an easy way to give a Py3k warning (issue 2671). Does this sound useful? -- Cheers, Benjamin Peterson

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annoying dictionary problem, non-existing keys
by bvidinli 25 Apr '08

25 Apr '08

i use dictionaries to hold some config data, such as: conf={'key1':'value1','key2':'value2'} and so on... when i try to process conf, i have to code every time like: if conf.has_key('key1'): if conf['key1']<>'': other commands.... this is very annoying. in php, i was able to code only like: if conf['key1']=='someth' in python, this fails, because, if key1 does not exists, it raises an exception. MY question: is there a way to directly get value of an array/tuple/dict item by key, as in php above, even if key may not exist, i should not check if key exist, i should only use it, if it does not exist, it may return only empty, just as in php.... i hope you understand my question... -- İ.Bahattin Vidinli Elk-Elektronik Müh. ------------------- iletisim bilgileri (Tercih sirasina gore): skype: bvidinli (sesli gorusme icin, www.skype.com) msn: bvidinli(a)iyibirisi.com yahoo: bvidinli +90.532.7990607 +90.505.5667711

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Do we still need BaseAddress in .vcproj files?
by Trent Nelson 25 Apr '08

25 Apr '08

I just did this locally to all my .vcproj files for .pyds: - BaseAddress="0x1e000000" + RandomizedBaseAddress="2" This was partly out of curiosity, and partly because it was quicker doing that than finding a new unique base address to use for a new module I added to my local tree. Rebuilt everything and ran a full regression test, and everything passed. What am I missing? Do we have parts of Python that rely on finding modules at explicit base addresses? Is BaseAddress a relic from the past? Christian or Martin? Trent.

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Summary of Tracker Issues
by Tracker 25 Apr '08

25 Apr '08

ACTIVITY SUMMARY (04/18/08 - 04/25/08) Tracker at http://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue number. Do NOT respond to this message. 1850 open (+26) / 12667 closed (+11) / 14517 total (+37) Open issues with patches: 558 Average duration of open issues: 707 days. Median duration of open issues: 1333 days. Open Issues Breakdown open 1828 (+26) pending 22 ( +0) Issues Created Or Reopened (37) _______________________________ Create ctypes instances from buffer interface 04/18/08 CLOSED http://bugs.python.org/issue2655 created theller patch, patch Autodoc should skip inherited methods 04/18/08 http://bugs.python.org/issue2656 created jmillikin curses 04/18/08 http://bugs.python.org/issue2657 created fer_perez decode_header() fails on multiline headers 04/19/08 http://bugs.python.org/issue2658 created cschnee textwrap handling of hyphenation 04/19/08 http://bugs.python.org/issue2659 created fourmanoit patch Py3k fails to parse a file with an iso-8859-1 string 04/19/08 http://bugs.python.org/issue2660 created azverkan Mapping tests cannot be passed by user implementations 04/19/08 http://bugs.python.org/issue2661 created danderson Allows HUGE_VAL as extern variable 04/20/08 CLOSED http://bugs.python.org/issue2662 created ocean-city patch shutil.copytree glob-style filtering [patch] 04/20/08 http://bugs.python.org/issue2663 created tarek patch The position of special value tables (cmathmodule.c) 04/21/08 http://bugs.python.org/issue2664 created ocean-city patch unable to launch IDLE on windows XP 04/21/08 CLOSED http://bugs.python.org/issue2665 created Leo webbrowser.py doesn't properly handle BROWSER env var 04/21/08 http://bugs.python.org/issue2666 created phd patch Remove multiple inheritance in Python 3000 04/22/08 CLOSED http://bugs.python.org/issue2667 created gmarketer apply() documentation is slightly incorrect 04/22/08 http://bugs.python.org/issue2668 created belopolsky bsddb iterkeys sliently fails when database modified during iter 04/22/08 http://bugs.python.org/issue2669 created tebeka urllib2 build_opener() fails if two handlers use the same defaul 04/22/08 CLOSED http://bugs.python.org/issue2670 created tlynn PyErr_WarnPy3k 04/22/08 http://bugs.python.org/issue2671 created benjamin.peterson patch speed of set.update( 04/23/08 CLOSED http://bugs.python.org/issue2672 created jameinel error on optparse page 04/23/08 CLOSED http://bugs.python.org/issue2673 created fbe2 unittest.TestProgram uses sys.exit() 04/23/08 http://bugs.python.org/issue2674 created tuben Curses terminal resize problems when Python is in interactive mo 04/23/08 http://bugs.python.org/issue2675 created pbazant email/message.py [Message.get_content_type]: Trivial regex hangs 04/23/08 http://bugs.python.org/issue2676 created ajaksu2 patch Argument rules for callables do not apply when function implemen 04/24/08 http://bugs.python.org/issue2677 created garden hmac performance optimization 04/24/08 CLOSED http://bugs.python.org/issue2678 created fafhrd patch email.feedparser regex duplicate 04/24/08 http://bugs.python.org/issue2679 created jimjjewett gotcha: _fields_ is final but accepts lists 04/24/08 CLOSED http://bugs.python.org/issue2680 created cscheid octal literals beginning with 8 don't raise a SyntaxError 04/24/08 CLOSED http://bugs.python.org/issue2681 created lukas.meuser patch cyclic reference in ctypes CFunctionType objects 04/24/08 http://bugs.python.org/issue2682 created theller patch subprocess.Popen.communicate takes bytes, not str 04/24/08 http://bugs.python.org/issue2683 created kermode Logging Module still failing for %(filename)s, __init__ 04/24/08 http://bugs.python.org/issue2684 created CharlesMerriam Add -mieee to compile flags, when available 04/24/08 http://bugs.python.org/issue2685 created marketdickinson patch Any chance we could double the height of the 'Comment:' text are 04/24/08 CLOSED http://bugs.python.org/issue2686 created Trent.Nelson SSL example script fails mysteriously on MacOS 04/25/08 http://bugs.python.org/issue2687 created akuchling Error when nesting many while loops 04/25/08 http://bugs.python.org/issue2688 created rgreimel Fix indentation in range_item 04/25/08 http://bugs.python.org/issue2689 created belopolsky patch Precompute range length 04/25/08 http://bugs.python.org/issue2690 created belopolsky patch Document size_t related long object APIs 04/25/08 http://bugs.python.org/issue2691 created belopolsky Issues Now Closed (27) ______________________ Python 2.4+ spends too much time in PyEval_EvalFrame w/ xmlrpmcl 180 days http://bugs.python.org/issue1327 amaury.forgeotdarc cmath is numerically unsound 172 days http://bugs.python.org/issue1381 marketdickinson patch sqrt(-1) doesn't raise ValueError on OS X 92 days http://bugs.python.org/issue1879 marketdickinson patch xmlrpclib cannot send datetime objects with dates before 1900 75 days http://bugs.python.org/issue2014 schmir patch Restructure import.c into PEP 302 importer objects 64 days http://bugs.python.org/issue2135 brett.cannon patch % string formatting does not support %b 31 days http://bugs.python.org/issue2416 eric.smith Issues with getargs_n() and PyNumber_Index. 33 days http://bugs.python.org/issue2440 Trent.Nelson patch, patch, 64bit imp.get_magic() should return bytes, not bytearray 32 days http://bugs.python.org/issue2471 amaury.forgeotdarc patch IMPORT_NAME Documentation is incomplete 5 days http://bugs.python.org/issue2631 georg.brandl Improve subprocess.Popen() documentation ("env" parameter) 5 days http://bugs.python.org/issue2633 georg.brandl os.execvpe() docs need to be more specific 5 days http://bugs.python.org/issue2634 georg.brandl shutil.copyfile() documentation is vague 4 days http://bugs.python.org/issue2639 georg.brandl httplib throws ValueError 4 days http://bugs.python.org/issue2645 georg.brandl patch Typo at http://docs.python.org/dev/3.0/howto/doanddont.html 0 days http://bugs.python.org/issue2654 akuchling Create ctypes instances from buffer interface 7 days http://bugs.python.org/issue2655 theller patch, patch Allows HUGE_VAL as extern variable 0 days http://bugs.python.org/issue2662 marketdickinson patch unable to launch IDLE on windows XP 1 days http://bugs.python.org/issue2665 amaury.forgeotdarc Remove multiple inheritance in Python 3000 0 days http://bugs.python.org/issue2667 gmarketer urllib2 build_opener() fails if two handlers use the same defaul 0 days http://bugs.python.org/issue2670 amaury.forgeotdarc speed of set.update( 2 days http://bugs.python.org/issue2672 jameinel error on optparse page 1 days http://bugs.python.org/issue2673 benjamin.peterson hmac performance optimization 0 days http://bugs.python.org/issue2678 amaury.forgeotdarc patch gotcha: _fields_ is final but accepts lists 0 days http://bugs.python.org/issue2680 theller octal literals beginning with 8 don't raise a SyntaxError 0 days http://bugs.python.org/issue2681 amaury.forgeotdarc patch Any chance we could double the height of the 'Comment:' text are 0 days http://bugs.python.org/issue2686 Trent.Nelson tokenize module w/ coding cookie 1838 days http://bugs.python.org/issue719888 Trent.Nelson patch xmlrpclib.Binary doesn't say which base64 spec it implements 285 days http://bugs.python.org/issue1753732 benjamin.peterson patch, easy Top Issues Most Discussed (10) ______________________________ 25 Write user's version of the reference guide 869 days open http://bugs.python.org/issue1376292 7 Argument rules for callables do not apply when function impleme 1 days open http://bugs.python.org/issue2677 6 speed of set.update( 2 days closed http://bugs.python.org/issue2672 5 unable to launch IDLE on windows XP 1 days closed http://bugs.python.org/issue2665 4 cyclic reference in ctypes CFunctionType objects 1 days open http://bugs.python.org/issue2682 4 httplib throws ValueError 4 days closed http://bugs.python.org/issue2645 4 Regexp 2.6 (modifications to current re 2.2.2) 10 days open http://bugs.python.org/issue2636 4 Adapt pydoc to new doc system 95 days open http://bugs.python.org/issue1883 3 Any chance we could double the height of the 'Comment:' text ar 0 days closed http://bugs.python.org/issue2686 3 gotcha: _fields_ is final but accepts lists 0 days closed http://bugs.python.org/issue2680

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