Mailman 3 August 2001 - Python-Dev

interesting page of links on VM design
by Jeremy Hylton 07 Aug '01

07 Aug '01

http://www.ce.chalmers.se/~feldt/ruby/ideas/rubyvm/ Found this link by a circuitous route (David Simmons' post to language-dev, leading to www.smallscript.net which discusses QKS work, includes link to related topics). May be interesting, related to Parrot thread. Jeremy

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HAVE_HYPOT still needed?
by Jack Jansen 07 Aug '01

07 Aug '01

As I was removing outdated #ifdefs my eye fell on HAVE_HYPOT, and I have this very vague recollection that some old 68K Macs were the only system where hypot() wasn't in the C library. Does anyone know this for sure? If so we could remove the whole hypot() stuff... -- Jack Jansen | ++++ stop the execution of Mumia Abu-Jamal ++++ Jack.Jansen(a)oratrix.com | ++++ if you agree copy these lines to your sig ++++ www.oratrix.nl/~jack | ++++ see http://www.xs4all.nl/~tank/ ++++

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PEP 252: class methods
by Armin Rigo 07 Aug '01

07 Aug '01

Hello, PEP 252: as described, class methods have no equivalent in C++ or Java; I would just like to point out that the Pascal dialect "Delphi" of Borland has this feature (called "virtual class methods"), which I personnally used a lot in one of my applications. Armin

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ANN: PyChecker v0.8
by Neal Norwitz 07 Aug '01

07 Aug '01

A new version of PyChecker is available for your hacking pleasure. PyChecker is a tool for finding common bugs in python source code. It finds problems that are typically caught by a compiler for less dynamic languages, like C and C++. Comments, criticisms, new ideas, and other feedback is welcome. Change Log from 0.7.5 to 0.8: * Add check for accessing list as list[1,2], should be slice 1:2 * Add -J/maxargs to warn when using too many arguments * Add -K/maxlocals to warn when using too many local variables * Add -D/intdivide to warn when using integer division * Add -O/objattrs to warn when using object.attribute that doesn't exist * Add -M/reimportself to warn when a module imports itself * Add -E/unusednames to provide a list of unused names to ignore (default is: [ '_', 'empty', 'unused' ]) * Major refactoring of warn.py -> utils, msgs, Warning, CodeChecks * Fix spurious warnings for No class attribute for dynamic classes * Fix spurious warnings when using objects from blacklisted modules (Instantiating object with arguments, but no constructor, etc) * Fix spurious warnings when using lambdas * Fix spurious warning (No global Y) when using: from X import Y (problem in python 1.5/1.6 only) In case you missed 0.7.5, here's the change Log from 0.7 to 0.7.5: * Suppress warnings on a per module/function/class/method basis with new suppressions = {} in .pycheckrc * Suppress warnings by setting __pychecker__ in source code * Change long argument behaviour --arg sets arg to true, --no-arg sets arg to false (also works for warning suppression) * Add -U/--reuseattr check if function/class/method names are reused * Add -T/--argsused check for unused method/function arguments * Add -G/--selfused ignore if self is unused in a method (requires --argsused) * Add -q/--stdlib to disable warnings from the standard library * Add -o/--override warning when a method has different signature than one being overridden in a base class * Add -F/--rcfile to generate a .pycheckrc file * Fix checking files in standard library before local file * Fix spurious warning when using from X import Y and imports in methods (Module (m) re-imported) * Fix spurious warning when doing: from X import Y, Z * Fix spurious warning when deriving from Exception() and instantiating object with multiple arguments * Fix method argument checks when calling base class methods * Fix error msg to base constructors (msg count was wrong) * Fix access to builtin module attributes (e.g., sys.exc_value) generating 'No attribute warnings' * Fix tests (forgot to add : after line number in expected results) PyChecker is available on Source Forge: Web page: http://pychecker.sourceforge.net/ Project page: http://sourceforge.net/projects/pychecker/ Neal -- pychecker(a)metaslash.com

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Intel's Open Runtime Platform (ORP)
by Neil Schemenauer 06 Aug '01

06 Aug '01

I just saw this while updating my Debian machine: Package: orp Description: Java VM and JIT from Intel Research Lab. ORP stands for Open Runtime Platform, which is an Intel(TM) Open Source research platform for investigating dynamic compilation and memory management technologies. The basic ORP system incorporates a fast code generating JIT (Just-In-Time) as well as an optimizing JIT. It also includes several GC (Garbage Collection) algorithms, ranging from a simple mark-sweep algorithm to an advanced train algorithm. Its available at http://intel.com/research/mrl/orp/ and is released under a BSD-like license. Neil

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'*' instead of 'yield'?
by Roman Suzi 06 Aug '01

06 Aug '01

Hello! Maybe it will be nicier to have unary * instead of 'yield' for generators? Example I already posted to c.l.p: from __future__ import generators import calendar, string def calt(year, month): month_cal = calendar.monthcalendar(year, month) * """<B>%s.%s</B>""" % (month, year) * """<TABLE BORDER=1>""" for week in month_cal: * """\n<TR>""" for day in week: * """<TD>%s</TD>""" % (day or " ") * """</TR>""" * """</TABLE>""" print string.join(calt(2001, 8), "") (This will also enable yields from expressions) Sincerely yours, Roman Suzi -- _/ Russia _/ Karelia _/ Petrozavodsk _/ rnd(a)onego.ru _/ _/ Sunday, August 05, 2001 _/ Powered by Linux RedHat 6.2 _/ _/ "By all means, let's not confuse ourselves with the facts!" _/

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Cleaning up Misc/ directory
by Andrew Kuchling 06 Aug '01

06 Aug '01

There are a few files in the Misc/ directory that can probably be discarded: BLURB, BLURB.*, and HYPE : several duplicated descriptions of Python. I volunteer to edit them down to one BLURB file. editline-fix : is the problem and fix described still relevant? find_recursionlimit.py : unnecessary now that sys.getrecursionlimit() exists. fixfuncptrs.sh : seems to add casts to the type structure in a module RFD : the RFD for comp.lang.python. Can disappear now that the group has been created. --amk

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[guido@zope.com: Re: [Python-Dev] Re: WebDAV in python 2.2?]
by Greg Stein 06 Aug '01

06 Aug '01

[ misaddressed... ] ----- Forwarded message from Guido van Rossum <guido(a)zope.com> ----- From: Guido van Rossum <guido(a)zope.com> Subject: Re: [Python-Dev] Re: WebDAV in python 2.2? To: Greg Stein <gstein(a)lyra.org> Date: Fri, 03 Aug 2001 15:18:37 -0400 > My intent was to write a short PEP because there would be a couple modules > to add to the lib: > > 1) httpauth -- subclasses httplib.HTTPConnection to add authenticated > connections. Initially using the Basic auth method, but it could also be > expanded to Digest (and others) > > 2) davlib -- my existing module. needs a couple items of work: allow > alternate/fallback XML parsers (it uses Expat + qp_xml right now), and > use the authenticated HTTP connections. > > That is at least a start on what needs to happen. We can flesh it out with a > PEP or by checking in the modules. > (Moshe and I talked about httpauth a bit at the last Python Conference; I > know he is interested in working on something like that) Good! > I'm not sure how we normally write tests for network-based modules, but it > shouldn't be too hard to have them run against test.webdav.org. Can someone help Greg with his question about testing network modules? Generally the test suite doesn't assume internet access; network code is "tested" using a second thread and localhost. --Guido van Rossum (home page: http://www.python.org/~guido/) ----- End forwarded message ----- -- Greg Stein, http://www.lyra.org/

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Re: [Python-Dev] FW: [Python-Help] Python threads with suncc (Forte 6.1) compiler
by Michael Hudson 06 Aug '01

06 Aug '01

Guido van Rossum <guido(a)zope.com> writes: > > (2) AIUI, if you really care about performance you should be using > > poll() anyway (tho' obviously this depends on your platform having > > poll() in the first place, and I don't have the faintest idea how > > widespread it is). > > Very widespread. I forget -- what's the reason for poll()'s claim to > better performance? Appropriately enough, it avoids the need to much about with fd_sets for each syscall, which makes a difference when yo are dealing with huge numbers of sockets (again, I think). Cheers, M. -- I have long since given up dealing with people who hold idiotic opinions as if they had arrived at them through thinking about them. -- Erik Naggum, comp.lang.lisp

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Re: [Python-Dev] FW: [Python-Help] Python threads with suncc (Forte 6.1) compiler
by Michael Hudson 05 Aug '01

05 Aug '01

"Tim Peters" <tim.one(a)home.com> writes: > [Guido, on reworking select()] > > Yes, I think we do need this. PyObject_AsFileDescriptor() calls the > > fileno() method which could be a Python call. > > Ya, but for me to believe that *matters*, I have to believe people worried > about high-performance select are passing objects with Python-implemented > fileno methods to begin with. That's quite a stretch, isn't it? They have > to pay for fileno() calls regardless, the question is only whether they pay > it once or twice per object. Posted admittedly without checking any facts: (1) Doesn't the Python fileno() method issue leave you open to ridiculous fileno() methods that mutate the list passed in to select()? (2) AIUI, if you really care about performance you should be using poll() anyway (tho' obviously this depends on your platform having poll() in the first place, and I don't have the faintest idea how widespread it is). Cheers, M. -- The ultimate laziness is not using Perl. That saves you so much work you wouldn't believe it if you had never tried it. -- Erik Naggum, comp.lang.lisp

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