Mailman 3 June 2009 - Python-Dev

pthread sem PyThread_acquire_lock
by Florian Mayer 02 Jul '09

02 Jul '09

Hello. As this is my first post I will try to introduce myself as requested in the welcome email. If you aren't interested in my person, just continue reading at the next paragraph. I'm a student from Vienna/Austria. I attend what would match high school in the United States. I have been writing Python for about 3 years now and have just began to dig into the implementation of CPython. Now to my real question. I have noticed that PyThread_acquire_lock swallows all signals with pthread using sems. Looking at the source code it appears that this is intended, but I cannot see the reason for that. It seems the pthread sem implementation is the only one doing so. Can any of you tell me the reason why it swallows signals? I have already prepared a patch that introduces a new _noswallow function if sem are used and uses this in threadmodule.c. But if there isn't any real reason for it to swallow exceptions, I think it would be wisest to change that. Best regards, Florian Mayer

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Exception for setting attributes of built-in type
by Seo Sanghyeon 02 Jul '09

02 Jul '09

Exception for setting attributes of built-in type differs between CPython and IronPython. This is not purely theoretical, as zope.interface tries to set Implements declaration as __implemented__ attribute of built-in type object, and excepts TypeError. Python 2.6.1 >>> object.flag = True TypeError: can't set attributes of built-in/extension type 'object' IronPython 2.6 >>> object.flag = True AttributeError: 'object' object has no attribute 'flag' I was surprised that CPython raises TypeError. Library Reference seems to mention it here: exception AttributeError Raised when an attribute reference or assignment fails. (When an object does not support attribute references or attribute assignments at all, TypeError is raised.) http://docs.python.org/library/exceptions.html What does it mean that "an object does not support attribute references or attribute assignments at all"? -- Seo Sanghyeon

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Re: [Python-Dev] PEP 376
by P.J. Eby 01 Jul '09

01 Jul '09

At 07:57 PM 6/29/2009 +0200, Tarek Ziadé wrote: >Hello, > >If no one objects, I'd like to push PEP 376 in the "accepted" status >and go ahead with its implementation, >with continuous feedback at Distutils-SIG as we did to build it. I do have a question about the current draft... Do zipped distributions use EGG-INFO or a project-version.egg-info? This isn't spelled out in the PEP, although I get the general idea that the EGG-INFO format isn't supported, and thus the PEP and API do not support existing .egg files. This should probably be made clear, if that's the intention.

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Flow of control - a new way - Idea
by vin vin 30 Jun '09

30 Jun '09

HI all I am not the too technical guy, but thinking about the new way of controlling the flow instead of throwing an error. as of now if we need to break a control and go back, exceptions helps, but it is not a actual way. it would be great if we have a control over the frames execution, I mean A calls B which calls C which calls D at that point if we think to move directly to B (what error handler do if that B has the handler defined of the error), changing the frames instruction pointer to back to the B's position (in python code without raising an exception) is a really useful for this web applications. ----------------------------- How we can achieve this? a simple way? Actually python interpreter currently doing this. How? method *A* method *B* <== has exception handler try: except: method *C* method *D* <========= got exception here.. now exception handler checks that which caller methods has the exception handler provided for this exception. in our case method B has this. so, the instruction pointer has moved back to that method B with the exception. ------------------- We can have this same functionality* BUT WITHOUT THE USE OF EXCEPTION*. where it can help? so many places, & it gives the full power of execution control to the user. A simple usage of this is : Currently most of the WSGI frameworks breaking the flow if needed to go on another route, it simple raising the exception, But if any of the called modules handled those exceptions it fails the flow. and we can't guide the extension modules to don't use full try except as it is the pythons power. What you say? Please excuse me if we have this control already, (can u explain?) I hope, currently no languages gives such full control over coders. -- Thanks Vinoth

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Anyone against having a loop option for regrtest?
by Jesse Noller 29 Jun '09

29 Jun '09

Something that's been helping me squirrel out "wacky" and "fun" bugs in multiprocessing is running the tests in a loop - sometimes hundreds of times. Right now, I hack this up with a bash script, but I'm sitting here wondering if adding a "loop for x iterations" option to regrtest.py would be useful to others as well. Any thoughts? Does anyone hate this idea with the power of a thousand suns? -jesse

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Re: [Python-Dev] ndPython: I NEED TO TALK WITH ONE OF THE PYTHON CORE
by Filippo Battaglia 29 Jun '09

29 Jun '09

Thanks for your answers. Sorry for the title in upper case. I didn't want to create troubles. :) I've an important question for you: is it possible that a large python module, created using SWIG and with a hundred of routines, makes slower the execution (i.e. the job of ceval.c) of the Python interpreter ? We've observed that, if we don't import ndpsp.pyc at startup, the time of execution of a loop containing the pass instruction becomes near normal. How Python recalls the C functions in a C wrapper ? Thanks for your very important help. Filippo Battaglia

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2.4.7: Final 2.4 release
by "Martin v. Löwis" 29 Jun '09

29 Jun '09

Python 2.4 will become 5 years old this November. I plan to make the final security release this month or next month. If you want to see additional patches in Python 2.4, please let us now, or commit them yourself if you can. Remember that only security fixes can be considered for inclusion, and preferably only fixes that have already been applied to later releases of Python. Regards, Martin

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[RELEASED] Python 3.1 final
by Benjamin Peterson 28 Jun '09

28 Jun '09

On behalf of the Python development team, I'm thrilled to announce the first production release of Python 3.1. Python 3.1 focuses on the stabilization and optimization of the features and changes that Python 3.0 introduced. For example, the new I/O system has been rewritten in C for speed. File system APIs that use unicode strings now handle paths with undecodable bytes in them. Other features include an ordered dictionary implementation, a condensed syntax for nested with statements, and support for ttk Tile in Tkinter. For a more extensive list of changes in 3.1, see http://doc.python.org/3.1/whatsnew/3.1.html or Misc/NEWS in the Python distribution. To download Python 3.1 visit: http://www.python.org/download/releases/3.1/ The 3.1 documentation can be found at: http://docs.python.org/3.1 Bugs can always be reported to: http://bugs.python.org Enjoy! -- Benjamin Peterson Release Manager benjamin at python.org (on behalf of the entire python-dev team and 3.1's contributors)

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Summary of Python tracker Issues
by Python tracker 26 Jun '09

26 Jun '09

ACTIVITY SUMMARY (06/19/09 - 06/26/09) Python 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. 2242 open (+17) / 15925 closed (+16) / 18167 total (+33) Open issues with patches: 889 Average duration of open issues: 657 days. Median duration of open issues: 408 days. Open Issues Breakdown open 2212 (+17) pending 30 ( +0) Issues Created Or Reopened (33) _______________________________ test_with.py has a couple minor mistakes 06/19/09 CLOSED http://bugs.python.org/issue6313 created exarkun patch logging.basicConfig(level='DEBUG', ... 06/20/09 CLOSED http://bugs.python.org/issue6314 created alexl locale._build_localename(locale.getdefaultlocale()) returns 'C.m 06/20/09 CLOSED http://bugs.python.org/issue6315 created sjt format, str.format don't work well with datetime, date object 06/20/09 CLOSED http://bugs.python.org/issue6316 created falsetru winsound.PlaySound doesn't accept non-unicode string 06/21/09 http://bugs.python.org/issue6317 created ocean-city patch HTMLParser Attributes Containing Escaped Quotes 06/21/09 CLOSED http://bugs.python.org/issue6318 created ericryk bdist_msi runs out of memory for large packages 06/21/09 CLOSED http://bugs.python.org/issue6319 created bethard patch Standard string encodings should include GSM0.38 06/21/09 http://bugs.python.org/issue6320 created jwishnie Reload Python modules when running programs 06/22/09 http://bugs.python.org/issue6321 created samwyse Pdb breakpoints don't work on lines without bytecode 06/22/09 http://bugs.python.org/issue6322 created inducer Py3.1 pdb doesn't deal well with syntax errors 06/22/09 http://bugs.python.org/issue6323 created inducer patch, needs review "in" expression falls back to __iter__ before __getitem__ 06/22/09 http://bugs.python.org/issue6324 created afoglia robotparser doesn't handle URL's with query strings 06/23/09 http://bugs.python.org/issue6325 created skybrian Add a "swap" method to list 06/23/09 http://bugs.python.org/issue6326 created krisvale patch, patch [mimetext] long lines get cut with exclamation mark and newline 06/23/09 http://bugs.python.org/issue6327 created martijntje login() function failed in smtplib with message "argument 1 must 06/23/09 CLOSED http://bugs.python.org/issue6328 created hdvision Fix iteration for memoryviews 06/23/09 CLOSED http://bugs.python.org/issue6329 created rhettinger patch trunk does not build with --enable-unicode=ucs4 06/23/09 http://bugs.python.org/issue6330 created eric.smith easy Add unicode script info to the unicode database 06/23/09 http://bugs.python.org/issue6331 created doerwalter patch typo on man page warning control 06/23/09 CLOSED http://bugs.python.org/issue6332 created lieryan patch logging: ValueError: I/O operation on closed file 06/24/09 http://bugs.python.org/issue6333 created srid 3.0/3.1: Bad bug in range() computation (or possible Integer pro 06/24/09 CLOSED http://bugs.python.org/issue6334 created mfxmfx patch Add support for mingw 06/24/09 http://bugs.python.org/issue6335 created smartmobili patch nb_divide missing in docs 06/24/09 http://bugs.python.org/issue6336 created flub multiprocessing module: Double close of sys.stdin - ID: 2811568 06/24/09 CLOSED http://bugs.python.org/issue6337 created subdir patch Error message displayed on stderr when no C compiler is present 06/24/09 http://bugs.python.org/issue6338 created ehuss patch Some functional errors in turtle.py documentation (missing links 06/24/09 CLOSED http://bugs.python.org/issue6339 created gregorlingl replace tdemo_chaos.py 06/24/09 CLOSED http://bugs.python.org/issue6340 created gregorlingl io.path.ismount gives "local variable 'p' referenced before ass 06/25/09 CLOSED http://bugs.python.org/issue6341 created g.moralis io.path.ismount gives "local variable 'p' referenced before ass 06/25/09 CLOSED http://bugs.python.org/issue6342 created g.moralis TimedRotatingFileHandler permission denied rename failure on Win 06/25/09 http://bugs.python.org/issue6343 created dnagata mmap.read() crashes when passed a negative argument 06/25/09 http://bugs.python.org/issue6344 created amaury.forgeotdarc extra characters displayed when writing to sys.stdout.buffer 06/26/09 CLOSED http://bugs.python.org/issue6345 created metolone Issues Now Closed (31) ______________________ zlib.crc32() and adler32() return value 263 days http://bugs.python.org/issue1202 gregory.p.smith 64bit Tix HList class missing method implementation for info_bbox 627 days http://bugs.python.org/issue1230 gpolo xml/sax/expatreader.py raises AttributeError when run 202 days http://bugs.python.org/issue4490 amaury.forgeotdarc patch test_tcl testLoadTk fails if DISPLAY defined but connect fails, 105 days http://bugs.python.org/issue5450 gpolo patch pyexpat defines global symbol template_string 86 days http://bugs.python.org/issue5590 doko SimpleXMLRPCServer not suitable for HTTP/1.1 keep-alive 27 days http://bugs.python.org/issue6096 loewis patch, patch, easy, needs review HTTP/1.1 with keep-alive support for xmlrpclib.ServerProxy 27 days http://bugs.python.org/issue6099 loewis patch, patch, needs review Backport the IO lib to trunk 15 days http://bugs.python.org/issue6215 pitrou patch subprocess.Popen() may leak file descriptors 7 days http://bugs.python.org/issue6274 facundobatista patch Update contextlib.nested docs in light of deprecation 6 days http://bugs.python.org/issue6288 ncoghlan virtual memory error with archivemail 0 days http://bugs.python.org/issue6311 loewis test_with.py has a couple minor mistakes 0 days http://bugs.python.org/issue6313 benjamin.peterson patch logging.basicConfig(level='DEBUG', ... 2 days http://bugs.python.org/issue6314 vsajip locale._build_localename(locale.getdefaultlocale()) returns 'C.m 5 days http://bugs.python.org/issue6315 r.david.murray format, str.format don't work well with datetime, date object 0 days http://bugs.python.org/issue6316 falsetru HTMLParser Attributes Containing Escaped Quotes 0 days http://bugs.python.org/issue6318 georg.brandl bdist_msi runs out of memory for large packages 0 days http://bugs.python.org/issue6319 bethard patch login() function failed in smtplib with message "argument 1 must 0 days http://bugs.python.org/issue6328 r.david.murray Fix iteration for memoryviews 0 days http://bugs.python.org/issue6329 rhettinger patch typo on man page warning control 0 days http://bugs.python.org/issue6332 georg.brandl patch 3.0/3.1: Bad bug in range() computation (or possible Integer pro 1 days http://bugs.python.org/issue6334 mfxmfx patch multiprocessing module: Double close of sys.stdin - ID: 2811568 0 days http://bugs.python.org/issue6337 jnoller patch Some functional errors in turtle.py documentation (missing links 1 days http://bugs.python.org/issue6339 r.david.murray replace tdemo_chaos.py 1 days http://bugs.python.org/issue6340 r.david.murray io.path.ismount gives "local variable 'p' referenced before ass 0 days http://bugs.python.org/issue6341 r.david.murray io.path.ismount gives "local variable 'p' referenced before ass 0 days http://bugs.python.org/issue6342 amaury.forgeotdarc extra characters displayed when writing to sys.stdout.buffer 0 days http://bugs.python.org/issue6345 benjamin.peterson curselection() in Tkinter.py should return ints 1997 days http://bugs.python.org/issue869780 gpolo patch Add XML-RPC Fault Interoperability to XMLRPC libraries 1310 days http://bugs.python.org/issue1360243 loewis patch, easy Tix ComboBox entry is blank when not editable 944 days http://bugs.python.org/issue1600182 gpolo syslog syscall support for SysLogLogger 782 days http://bugs.python.org/issue1711603 LwarX patch Top Issues Most Discussed (10) ______________________________ 9 Native (and default) tarfile support for setup.py sdist in dist 9 days open http://bugs.python.org/issue6296 9 ElementTree (py3k) doesn't properly encode characters that can' 19 days open http://bugs.python.org/issue6233 9 Python 2.6 makes .pyc/.pyo bytecode files executable 37 days open http://bugs.python.org/issue6070 7 3.0/3.1: Bad bug in range() computation (or possible Integer pr 1 days closed http://bugs.python.org/issue6334 6 cElementTree.iterparse & ElementTree.iterparse return different 15 days open http://bugs.python.org/issue6266 5 Add a "swap" method to list 3 days open http://bugs.python.org/issue6326 5 Py3.1 pdb doesn't deal well with syntax errors 4 days open http://bugs.python.org/issue6323 5 os.popen causes illegal seek on AIX in Python 3.1rc 19 days open http://bugs.python.org/issue6236 5 test_tcl testLoadTk fails if DISPLAY defined but connect fails, 105 days closed http://bugs.python.org/issue5450 5 Document auto __ne__ generation; provide a use case for non-tri 215 days open http://bugs.python.org/issue4395

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Re: [Python-Dev] [Python-checkins] r73569 - peps/trunk/pep-0101.txt
by Barry Warsaw 26 Jun '09

26 Jun '09

On Jun 26, 2009, at 8:49 AM, benjamin.peterson wrote: > Author: benjamin.peterson > Date: Fri Jun 26 14:48:55 2009 > New Revision: 73569 > > Log: > update release candidate shorthand > > Modified: > peps/trunk/pep-0101.txt > > Modified: peps/trunk/pep-0101.txt > = > = > = > = > = > = > = > = > ====================================================================== > --- peps/trunk/pep-0101.txt (original) > +++ peps/trunk/pep-0101.txt Fri Jun 26 14:48:55 2009 > @@ -66,7 +66,7 @@ > > We use the following conventions in the examples below. Where a > release > number is given, it is of the form X.YaZ, e.g. 2.6a3 for Python > 2.6 alpha > - 3, where "a" == alpha, "b" == beta, "c" == release candidate. > + 3, where "a" == alpha, "b" == beta, "rc" == release candidate. > > Final releases are named "releaseXY". The branch tag is > "releaseXY-maint" > because this will point to the long lived maintenance branch. > The fork I'm sure this has been discussed but I missed it. Why was this change made? If nothing else, it breaks many years of tradition. -Barry

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Python-Dev June 2009