Mailman 3 December 2001 - Python-Dev

win32all
by Jason L. Asbahr 10 Dec '01

10 Dec '01

Any thoughts on making this package more prominent on the Python.org download pages? Like under the primary Python 2.1.1 and Python 2.2 download links? ______________________________________________________________________ Jason Asbahr jason(a)asbahr.com

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update on memory leaks in 2.2
by Neal Norwitz 09 Dec '01

09 Dec '01

Command line: (longexp crashes purify for some reason) ./python -E -tt ./Lib/test/regrtest.py -u network -x test_longexp.py Results: 168 tests OK. 1 test failed: test_socket_ssl 15 tests skipped: test_al test_bsddb test_cd test_cl test_curses test_dl test_gl test_imgfile test_linuxaudiodev test_nis test_ntpath test_openpty test_sundry test_winreg test_winsound test test_socket_ssl crashed -- socket.sslerror: SSL_CTX_new error When running test_curses: test test_curses crashed -- _curses.error: curs_set() returned ERR Uninitialized Memory Reads (don't think these are python's fault): gdbm_open() gdbmmodule.c:68 getaddrinfo() socketmodule.c:636 Memory Leaks: NONE Potential Memory Leaks: 1012 from 4 different allocating points -- all in WeakRef Things look great! Let me know if any of the skipped tests ought to have been run. Most likely possibility seems to be bsddb, sundry also needs bsddb. Neal

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[development doc updates]
by Fred L. Drake 08 Dec '01

08 Dec '01

The development version of the documentation has been updated: http://python.sourceforge.net/devel-docs/ Another day of updates; various fixes and clarifications.

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Re: [Python-Dev] update on memory leaks in 2.2
by Guido van Rossum 07 Dec '01

07 Dec '01

> Guido van Rossum wrote: > > > What's a potential leak? Could it be that these are in cycles? The > > reported blocks are all weak reference objects; most of then are > > allocated by add_subclass(), which uses weak refs for the list of > > subclasses of a given (new-style) class. I suppose most weak refs are > > in cycles (else there would be no need for weak refs). Neal replied (in private email): > From page 157 of this doc: > > http://www.rational.com/support/documentation/manuals/unixsuites/pdf/purify… > > A PLK message describes heap memory that you might have > leaked. You have pointers only to the middle of the region. PLK is a > warning message. > > Memory in use can sometimes appear as a PLK if the pointer > returned by malloc is offset. A common cause is referencing a > substring within a large string. Another example is when a > pointer to a C++ object is cast to the second or later base class of a > multiply-inherited object. It is offset past the other base class > objects. > > Truly leaked memory can sometimes appear as a PLK, if some > non-pointer integer within the program space, when interpreted > as a pointer, points within an otherwise leaked block of memory. > This is rather rare. Inspect the code to differentiate between these > causes of PLK reports. Thanks, that's very helpful! Here's how I now understand what's happened. Weak references are garbage collected, which means that the malloc pointer points 12 bytes *before* the start of the object as the rest of Python knows about it. Objects in the free list are linked together via their object pointer, so they are only known via a pointer into their "middle". We don't see this warning for other GC'ed objects, because they are in one of the collector's linked lists, which point to the start of the GC header which is the malloc'ed pointer. But freed weak references are not known to the collector! So I'm confident that these are not leaks. --Guido van Rossum (home page: http://www.python.org/~guido/)

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dumbdbm.py
by Anthony Baxter 07 Dec '01

07 Dec '01

just had reason to be looking at dumbdbm.py - perhaps "terminallybrokendbm.py" would be a better name. There's a whole host of "oh. my. god." type things in there that are just broken, with massive dataloss problems if you end up (innocently) getting it from anydbm.py. I'm going to fix it either this arvo/evening or tomorrow, but it really shouldn't go out as part of 2.2 in it's current form. Is it too late to consider either fixing it or removing it from anydbm's list? Anthony

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Mac OS X sys.platform value
by Jack Jansen 07 Dec '01

07 Dec '01

Folks, Apple "wisely" changed their uname version numbering scheme with a micro-release (10.1.1). Of course, nobody cares about this, except Python, which stuffs the version into sys.platform, from where it is used by a gazillion things. Anyway, where sys.platform used to be "darwin1" upto and including 10.1.0 it is now "darwin5" for 10.1.1 (and it will go up to "darwin6" for 10.2, etc). I am of a mind to take the "1" out of sys.platform, so that it becomes "darwin". Good idea or not? -- Jack Jansen | ++++ stop the execution of Mumia Abu-Jamal ++++ Jack.Jansen(a)oratrix.com | ++++ if you agree copy these lines to your sig ++++ www.cwi.nl/~jack | ++++ see http://www.xs4all.nl/~tank/ ++++

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CONVITE HP ALERTA
by Keila - Curitiba 07 Dec '01

07 Dec '01

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Re: [Python-Dev] memory leaks in 2.2
by Michael Hudson 07 Dec '01

07 Dec '01

"Martin v. Loewis" <martin(a)v.loewis.de> writes: > > It's hard. Bugzilla has some good features there w.r.t. "unverified" > > vs. "new" vs. "accepted" and "fixed" vs "resolved", QA contacts, keyword > > handling for milestone/release targets, etc. I'm not sure how the SF > > bugtracker compares in practice but from a distance it seems a little > > weak there. > > SF recommends to use the Group for "unsupported", > "unverified". Unfortunately, the filtering capabilities leave a lot of > wishes. Is roundup usable yet? I played with it a bit yesterday, but I'm not really sure what's needed. It would have the advantage that if it didn't do something we needed, we could probably club it into doing it easily enough. Cheers, M. -- I never disputed the Perl hacking skill of the Slashdot creators. My objections are to the editors' taste, the site's ugly visual design, and the Slashdot community's raging stupidity. -- http://www.cs.washington.edu/homes/klee/misc/slashdot.html#faq

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Need help with distutils
by Guido van Rossum 07 Dec '01

07 Dec '01

Andrew Kuchling just unassigned from himself a whole slew of distutils-related bug reports. It appears that neither Andrew nor Greg Ward (the original maintainer) has the time to maintain this code any more. No-one at PythonLabs understands it or has the time to learn about it. So it's effectively orphaned. Does anybody want to volunteer? --Guido van Rossum (home page: http://www.python.org/~guido/)

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Comparing sequences ?!
by M.-A. Lemburg 06 Dec '01

06 Dec '01

I just tried (1,2,3) == [1,2,3] and found that the compare returns false. Is that intended ? Background: 1.0 == 1 == 1L also works, so it seems natural that comparing sequences of different types should work in the same way. I would even expect a two iterators to compare equal if they always return the same values (this could cause an endless loop for some endless iterators ;-). -- Marc-Andre Lemburg CEO eGenix.com Software GmbH ______________________________________________________________________ Consulting & Company: http://www.egenix.com/ Python Software: http://www.lemburg.com/python/

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