Mailman 3 September 2002 - Python-Dev

Re: [Python-Dev] PEP 277 (unicode filenames): please review
by Matthias Urlichs 01 Sep '02

01 Sep '02

Martin: > Indeed, that would be consistent. I deliberately want to leave this > out of PEP 277. On Unix, things are not that clear - as Jack points > out, readlink() and getcwd() also need consideration. > Linux and MacOSX use UTF-8 and should probably be treated as such, i.e. I want to open("äöü"), not open("äöü".encode("utf-8")). One interesting tidbit is that MacOSX requires Unicode filenames to be in NFD. I don't know whether anybody agreed on a standard normal form for Linux. > In this terrain, Windows has the cleaner API (they consider file names > as character strings, not as byte strings), so doing the right thing > is easier. > Byte strings are perfectly OK if they have a common encoding (meaning UTF-8, in some accepted normal form). Character strings are bad if their interpretation, or indeed their usability, changes with the presense of some random environment variable / registry entry / whatever. Under these constraints, calling it a character string vs. a byte string, and/or using it as such, is a matter of programmers' convenience. -- Matthias Urlichs

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Weekly Python Bug/Patch Summary
by Skip Montanaro 01 Sep '02

01 Sep '02

Bug/Patch Summary ----------------- 282 open / 2810 total bugs (+7) 119 open / 1676 total patches (+10) New Bugs -------- textwrap has problems wrapping hyphens (2002-08-17) http://python.org/sf/596434 Another dealloc stack killer (2002-08-25) http://python.org/sf/600007 Installing w/o admin generates key error (2002-08-27) http://python.org/sf/600952 bug in new execvpe (2002-08-27) http://python.org/sf/601077 weird header wrapping in email.Generator (2002-08-28) http://python.org/sf/601392 xmlrpclib ignores CDATA (2002-08-28) http://python.org/sf/601534 some int results that should be bool (2002-08-29) http://python.org/sf/601775 smtplib mishandles empty sender (2002-08-29) http://python.org/sf/602029 configure finds c++ w/o --with-cxx (2002-08-29) http://python.org/sf/602102 os.popen() negative error code IOError (2002-08-29) http://python.org/sf/602245 3rd parameter for Tkinter.scan_dragto (2002-08-30) http://python.org/sf/602259 Bgen should learn about booleans (2002-08-30) http://python.org/sf/602291 option for not writing .py[co] files (2002-08-30) http://python.org/sf/602345 Jaguar "install" does not overwrite (2002-08-30) http://python.org/sf/602398 non greedy match bug (2002-08-30) http://python.org/sf/602444 pydoc -g dumps core on Solaris 2.8 (2002-08-30) http://python.org/sf/602627 cgitb tracebacks not accessible (2002-08-31) http://python.org/sf/602893 New Patches ----------- test_commands test fails under Cygwin (2002-04-16) http://python.org/sf/544740 email: RFC 2231 parameters encoding (2002-08-26) http://python.org/sf/600096 IDLE [Open module]: import submodules (2002-08-26) http://python.org/sf/600152 Robustness tweak to httplib.py (2002-08-26) http://python.org/sf/600488 Refactoring of difflib.Differ (2002-08-27) http://python.org/sf/600984 build_ext forgets libraries par w MSVC (2002-08-28) http://python.org/sf/601314 obmalloc,structmodule: 64bit, big endian (2002-08-28) http://python.org/sf/601369 expose PYTHON_API_VERSION via sys (2002-08-28) http://python.org/sf/601456 replace_header method for Message class (2002-08-29) http://python.org/sf/601959 sys.path in user.py (2002-08-29) http://python.org/sf/602005 improper use of strncpy in getpath (2002-08-29) http://python.org/sf/602108 single shared ticker (2002-08-29) http://python.org/sf/602191 Closed Bugs ----------- test_commands test fails under Cygwin (2002-04-16) http://python.org/sf/544740 Various Playstation 2 Linux Test Errors (2002-06-12) http://python.org/sf/567892 Core dump when using mmap. (2002-08-20) http://python.org/sf/597938 execfile() not show filename when IOErro (2002-08-23) http://python.org/sf/599163 SocketServer wrong about allow_reuse_add (2002-08-24) http://python.org/sf/599681 sub[n] not working as expected. (2002-08-24) http://python.org/sf/599757 httplib.connect broken in 2.1 branch (2002-08-25) http://python.org/sf/599838 NameError value is not the name error (2002-08-25) http://python.org/sf/599869 Closed Patches -------------- "simplification" to ceval.c (2002-08-19) http://python.org/sf/597221 Failure building the documentation (2002-08-22) http://python.org/sf/598996

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Re: [Python-Dev] tiny optimization in ceval mainloop
by Michael Hudson 01 Sep '02

01 Sep '02

"Steve Holden" <sholden(a)holdenweb.com> writes: > > A bunch of 0.5% improvements add up. If there's not much cost in > > complexity, why not go for it? > > > > Yeah, right, we just need 200 of them and we're laughing. Computation in > infinitesimal time. Multiply up doesn't have the same ring to it, does it? Cheers, M. -- I don't have any special knowledge of all this. In fact, I made all the above up, in the hope that it corresponds to reality. -- Mark Carroll, ucam.chat

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RE: [Python-Dev] Re: [Python-checkins] python/nondist/sandbox/spambayes GBayes.py,1.7,1.8
by Tim Peters 01 Sep '02

01 Sep '02

[Neil Schemenauer] > ... > For whatever reason, setting HAMBIAS to 1.0 seems to produce worse results. It's remarkable. Graham's scheme is pasted together out of all sorts of things that shouldn't work <wink>, but this one seems the most mysterious. It has a huge effect in my 5x5 c.l.py test grid. Combining all unique msgs identified as false negative or false positive across all 20 test runs, At HAMBIAS = 1.0 total false negatives goes down by a factor of 2 (337 -> 166) total false positives goes up by a factor of 7.6 (23 -> 174) and some of the false positives are just amazing -- David Ascher announcing a Python conference, Laura Creighton pontificating about the GPL, ... it's hard to fathom! One innocuous example: """ Hello, I love all these speed debates but if speed were our only concern we would all be writing in assembly for all non internet based programs...! Thank you, Vincent A. Primavera prob = 0.99918657946 prob('only') = 0.645419 prob('would') = 0.349237 prob('hello,') = 0.342435 prob('assembly') = 0.34891 prob('thank') = 0.819611 prob('these') = 0.677099 prob('all') = 0.709966 prob('you,') = 0.803672 prob('concern') = 0.225352 prob('our') = 0.951928 prob('internet') = 0.942274 prob('speed') = 0.305927 prob('but') = 0.229635 prob('love') = 0.736116 prob('non') = 0.885065 prob('writing') = 0.150994 """ There's not a lot going on in that msg! *Perhaps* the primary effect of boosting HAMBIAS is to take common glue words (like 'these' and 'all') out of this uniquely "only look at smoking guns" scoring scheme altogether? I don't know what "sense" there is in letting 'these' vote in favor of spam, for example. At HAMBIAS = 3.0 total false negatives goes up by a factor of 2.08 (337 -> 702) total false positives goes down by a factor of 4.6 (23 -> 5) Somebody else think about this <wink>. It's certainly the easiest knob to twiddle to make a false-positive versus false-negative rate tradeoff.

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