Mailman 3 March 2003 - Python-Dev

iconv codec
by M.-A. Lemburg 31 Mar '03

31 Mar '03

Since the introduction of the iconv codec there have been numerous bug reports related to the codec and the lack of cross platform support for it (ranging from: the codec doesn't compile and the codec doesn't support standard names for common encodings to core dumps in the linking phase). I'd like to question whether the codec is really ready for prime time yet. Right now it causes people more trouble than it does any good. Some examples: https://sourceforge.net/tracker/?group_id=5470&atid=105470&func=detail&aid=… https://sourceforge.net/tracker/?group_id=5470&atid=105470&func=detail&aid=… https://sourceforge.net/tracker/?group_id=5470&atid=105470&func=detail&aid=… https://sourceforge.net/tracker/?group_id=5470&atid=105470&func=detail&aid=… The problem doesn't seem to be related to the code implementation itself, but rather the varying quality of iconv implementations out there. OTOH, without some field testing the codec will never get into shape for prime time, so perhaps it would be better to only enable it via a configure option or make a failure to compile the codec as painless as possible. -- Marc-Andre Lemburg eGenix.com Professional Python Software directly from the Source (#1, Mar 31 2003) >>> Python/Zope Products & Consulting ... http://www.egenix.com/ >>> mxODBC, mxDateTime, mxTextTools ... http://python.egenix.com/ ________________________________________________________________________ Python UK 2003, Oxford: 1 days left EuroPython 2003, Charleroi, Belgium: 85 days left

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Re: Fast access to __builtins__
by Michael Chermside 31 Mar '03

31 Mar '03

Raymond writes: > I've already tried out a pure python proof-of-concept Does that mean that you can give us some idea what kind of performance boost this actually resulted in? -- Michael Chermside

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Fast access to __builtins__
by Raymond Hettinger 31 Mar '03

31 Mar '03

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Compiler treats None both as a constant and variable
by Raymond Hettinger 30 Mar '03

30 Mar '03

>>> def f(): None >>> dis(f) 2 0 LOAD_GLOBAL 0 (None) 3 POP_TOP 4 LOAD_CONST 0 (None) 7 RETURN_VALUE >>> None = 1 <stdin>:1: SyntaxWarning: assignment to None >>> f() == None False Is this a bug? Should the compiler use the GLOBAL in both places? Or, is it reasonable to use CONST in both places? Raymond Hettinger

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Weekly Python Bug/Patch Summary
by Skip Montanaro 30 Mar '03

30 Mar '03

Bug/Patch Summary ----------------- 379 open / 3499 total bugs (+9) 138 open / 2050 total patches (+7) New Bugs -------- Lineno calculation sometimes broken (2003-03-24) http://python.org/sf/708901 socket timeouts produce wrong errors in win32 (2003-03-24) http://python.org/sf/708927 sgmllib.SGMLParser.reset() problem (2003-03-25) http://python.org/sf/709491 IDE stdin doesn't have readlines (2003-03-26) http://python.org/sf/710373 Raise IDE output window over splash screen on early crash (2003-03-26) http://python.org/sf/710374 math.log(0) differs from math.log(0L) (2003-03-27) http://python.org/sf/711019 A large block of commands after an "if" cannot be compiled (2003-03-28) http://python.org/sf/711268 htmllib.HTMLParser.anchorlist problem (2003-03-28) http://python.org/sf/711632 SEEK_{SET,CUR,END} missing in 2.2.2 (2003-03-29) http://python.org/sf/711830 Lookup of Mac error string can mess up resfile chain (2003-03-29) http://python.org/sf/711967 gensuitemodule needs to be documented (2003-03-29) http://python.org/sf/711986 IDE textwindow scrollbar is over-enthusiastic (2003-03-29) http://python.org/sf/711989 IDE needs easy access to builtin help() (2003-03-29) http://python.org/sf/711991 OpenBSD 3.2: make altinstall dumps core (2003-03-29) http://python.org/sf/712056 New Patches ----------- add offset to mmap (2003-03-23) http://python.org/sf/708374 OpenVMS complementary patches (2003-03-23) http://python.org/sf/708495 unchecked return values - compile.c (2003-03-23) http://python.org/sf/708604 remove -static option from cygwinccompiler (2003-03-24) http://python.org/sf/709178 CALL_ATTR opcode (2003-03-25) http://python.org/sf/709744 Make "%c" % u"a" work (2003-03-26) http://python.org/sf/710127 Backport to 2.2.2 of codec registry fix (2003-03-27) http://python.org/sf/710576 new test_urllib and patch for found urllib bug (2003-03-27) http://python.org/sf/711002 Warn about inter-module assignments shadowing builtins (2003-03-28) http://python.org/sf/711448 Removing unnecessary lock operations (2003-03-29) http://python.org/sf/711835 urllib2 doesn't support non-anonymous ftp (2003-03-29) http://python.org/sf/711838 Cause pydoc to show data descriptor __doc__ strings (2003-03-29) http://python.org/sf/711902 Obsolete comment in urlparse.py (2003-03-30) http://python.org/sf/712124 Closed Bugs ----------- 2.3a2 build fails on Solaris: posixmodule (2003-02-20) http://python.org/sf/690317 string.atoi function causing TypeError (2003-03-04) http://python.org/sf/697591 Tk 8.4.2 and Tkinter.py _substitue function (2003-03-05) http://python.org/sf/698517 _tkinter.c won't build w/o threads? (2003-03-16) http://python.org/sf/704641 imap docs: s/criterium/criterion/ (2003-03-17) http://python.org/sf/705120 timeouts incompatible w/ line-oriented protocols (2003-03-20) http://python.org/sf/707074 DistributionMetaData error ? (2003-03-23) http://python.org/sf/708320 Closed Patches -------------- fix xmlrpclib float marshalling bug (2002-03-19) http://python.org/sf/532180 Add _winreg support for Cygwin (2002-05-11) http://python.org/sf/554807 New codecs: html, asciihtml (2002-08-03) http://python.org/sf/590682 Check for readline 2.2 features (2002-12-29) http://python.org/sf/659834 AE Inheritance fixes (2003-03-12) http://python.org/sf/702620 Improve code generation (2003-03-20) http://python.org/sf/707257 fix for #698517, Tkinter and tk8.4.2 (2003-03-21) http://python.org/sf/707701 unchecked return value in import.c (2003-03-22) http://python.org/sf/708201

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cvs.python.sourceforge.net fouled up
by Graham Guttocks 26 Mar '03

26 Mar '03

$ cvs update cvs [update aborted]: recv() from server cvs.python.sourceforge.net: EOF I've been having this problem on and off for weeks now with anonymous Python cvs. ===== Regards, Graham http://mobile.yahoo.com.au - Yahoo! Mobile - Check & compose your email via SMS on your Telstra or Vodafone mobile.

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ossaudiodev tweak needs testing
by Greg Ward 25 Mar '03

25 Mar '03

Hi all -- I have another tweak to the ossaudiodev module that might make it work a little better. Background: some time ago, Jeremy and Guido had problems with test_ossaudiodev hanging due to a blocking open() call. So I made the open() non-blocking in rev 1.25 on 2003/03/11. But that screwed things up for David Hammerton, who emailed me privately the other day that a write() call later on was dying with EAGAIN -- not entirely surprising, since that's how write() is supposed to behave on a file descriptor opened with O_NONBLOCK if it would have blocked. Most OSS device drivers don't actually act that way (sigh), but apparently David's does. So this patch reverses the effect of open() with O_NONBLOCK, meaning the file is back in blocking mode in the conventional Unix sense. (It's in blocking mode in the OSS sense the whole time, or at least until Python code calls the nonblock() method on it.) If you have a Linux or FreeBSD machine with sound hardware that works, can you please run ./python Lib/test/regrtest.py -uaudio test_ossaudiodev with the current CVS head (ie. rev 1.25 of ossaudiodev.c and rev 1.4 of test_ossaudiodev.py), then apply this patch: --- Modules/ossaudiodev.c 11 Mar 2003 16:53:13 -0000 1.25 +++ Modules/ossaudiodev.c 25 Mar 2003 01:54:46 -0000 @@ -139,6 +139,15 @@ PyErr_SetFromErrnoWithFilename(PyExc_IOError, basedev); return NULL; } + + /* And (try to) put it back in blocking mode so we get the + expected write() semantics. */ + if (fcntl(fd, F_SETFL, 0) == -1) { + close(fd); + PyErr_SetFromErrnoWithFilename(PyExc_IOError, basedev); + return NULL; + } + if (ioctl(fd, SNDCTL_DSP_GETFMTS, &afmts) == -1) { PyErr_SetFromErrnoWithFilename(PyExc_IOError, basedev); return NULL; and try it again? If it works in both cases, great. If it crashed with CVS head (EAGAIN from write()?), and now works, wonderful! (Please let me know.) If it works before this patch but not with it, then PLEASE let me know! Otherwise I'll check this in. Thanks -- Greg -- Greg Ward <gward(a)python.net> http://www.gerg.ca/

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Checkins to Attic?
by Skip Montanaro 25 Mar '03

25 Mar '03

I noticed on the python-checkins list that several changes (newcompile.c and friends) were checked into what appears to be the Attic, e.g.: Update of /cvsroot/python/python/dist/src/Python In directory sc8-pr-cvs1:/tmp/cvs-serv2961/Python Modified Files: Tag: ast-branch newcompile.c Log Message: Redeclared stuff to stop wngs about signed-vs-unsigned mismatches. Index: newcompile.c =================================================================== RCS file: /cvsroot/python/python/dist/src/Python/Attic/newcompile.c,v retrieving revision 1.1.2.23 retrieving revision 1.1.2.24 Note the RCS file above. Not all files were in the Attic though: Update of /cvsroot/python/python/dist/src/Include In directory sc8-pr-cvs1:/tmp/cvs-serv2961/Include Modified Files: Tag: ast-branch compile.h Log Message: Redeclared stuff to stop wngs about signed-vs-unsigned mismatches. Index: compile.h =================================================================== RCS file: /cvsroot/python/python/dist/src/Include/compile.h,v I'm probably just missing something obvious, but I thought I'd ask. Skip

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funny leak
by Christian Tismer 24 Mar '03

24 Mar '03

Hi Tim et al, I just tested generators and found a memory leak. (Has nothing to do with generators). The following code adds one to the overall refcount and gc cannot reclaim it. def conjoin(gs): def gen(): gs # unbreakable cycle gen # unless one is commented out Should I send a bug report, or is this known? The above holds for Python 2.2.2 upto the current CVS version. ciao - chris -- Christian Tismer :^) <mailto:tismer@tismer.com> Mission Impossible 5oftware : Have a break! Take a ride on Python's Johannes-Niemeyer-Weg 9a : *Starship* http://starship.python.net/ 14109 Berlin : PGP key -> http://wwwkeys.pgp.net/ work +49 30 89 09 53 34 home +49 30 802 86 56 pager +49 173 24 18 776 PGP 0x57F3BF04 9064 F4E1 D754 C2FF 1619 305B C09C 5A3B 57F3 BF04 whom do you want to sponsor today? http://www.stackless.com/

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How to suppress instance __dict__?
by David Abrahams 24 Mar '03

24 Mar '03

I am generating extension types derived from a type which is derived from int 'int' by calling the metaclass; in order to prevent instances of the most-derived type from getting an instance __dict__ I am putting an empty tuple in the class __dict__ as '__slots__'. The problem with this hack is that it disables pickling of these babies: "a class that defines __slots__ without defining __getstate__ cannot be pickled" Yes, I can define __getstate__, __setstate__, and __getinitargs__ (the only one that can actually do any work, since ints are immutable), but I was wondering if there's a more straightforward way to suppress the instance __dict__ in the derived classes. TIA, -- Dave Abrahams Boost Consulting www.boost-consulting.com

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