Mailman 3 March 2003 - Python-Dev

RE: [Python-Dev] Extended Function syntax
by Moore, Paul 10 Mar '03

10 Mar '03

From: Samuele Pedroni [mailto:pedronis@bluewin.ch] > the first candidate would be a generalization of 'class' > (although that make it redundant with 'class' and meta-classes) > so that > > KEYW-TO-BE kind name [ '(' expr,... ')' ] [ maybe [] extended syntax ]: > suite > > would be equivalent to > > name = kind(name-as-string,(expr,...),dict-populated-executing-suite) [fixed up to exclude the docstring, as per the followup message] I like this - it's completely general, and easy to understand. Then again, I always like constructs defined in terms of code equivalence, it seems to be a good way to make the semantics completely explicit. The nice thing, to me, is that it solves the immediate problem (modulo a suitable "kind" to work for properties), as well as being extensible to allow it to be used in more general contexts. The downside may be that it's *too* general - I've no feel for how it would look if overused - it might feel like people end up defining their own application language. > the remaining problem would be to pick a suitable KEYW-TO-BE "block"? Someone, I believe, suggested reusing "def" - this might be nice, but IIRC it won't work because of the grammar's strict lookahead limits. (If it does work, then "def" looks good to me). If def won't work, how about "define"? The construct is sort of an extended form of def. Or is that too cute? By the way, can I just say that I am +1 on Michael Hudson's original patch for [...] on definitions. Even though it doesn't solve the issue of properties, I think it's a nice solution for classmethod and staticmethod, and again I like the generality. Paul.

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Where is OSS used?
by Greg Ward 10 Mar '03

10 Mar '03

I'm working on docs for ossaudiodev, and I thought I'd ask here before bugging the OSS people: does anyone know which operating systems use OSS (Open Sound System) as the standard audio interface? I know Linux up to 2.4 does, as do some (all?) versions of FreeBSD. Do any of the other BSD flavours (OpenBSD, NetBSD, ...) use OSS out-of-the-box? (If you have access to a FooBSD box, take a look for /usr/include/*/soundcard.h -- if it looks like this: """ #ifndef SOUNDCARD_H #define SOUNDCARD_H /* * Copyright by Hannu Savolainen 1993-1997 [...] """ then it's OSS.) Anyone know precisely which 2.5.x version of Linux dropped OSS in favour of ALSA? Please reply directly to me -- my python-dev subscription is temporarily disabled because I went on holiday a week ago, and still haven't caught up with my other email backlog... Thanks -- Greg -- Greg Ward <gward(a)python.net> http://www.gerg.ca/ I just read that 50% of the population has below median IQ!

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Re: Capabilities
by Zooko 09 Mar '03

09 Mar '03

Following-up to my own post in order to apologize for contributing to the tradition of confusing restricted execution with rexec. I, Zooko, wrote: > > 2. Mandatory private data (accessible only by the object itself). Normal > Python doesn't have mandatory private data. If I understand correctly, both > rexec and proxies (attempt to) provide this. They also attempt to provide > another safety feature: a wrapper around the standard library and builtins that > turns off access to dangerous features according to an overridable security > policy. Perhaps it is that "restricted execution" is designed to provide private data, by disabling certain introspection features, and "rexec" and "proxies" are designed to provide the wrapper feature? Regards, Zooko

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acceptability of asm in python code?
by Damien Morton 09 Mar '03

09 Mar '03

In the BINARY_ADD opcode, and in most arithmetic opcodes, there is a line that checks for overflow that looks like this: if ((i^a) < 0 && (i^b) < 0) goto slow_add; I got a small speedup by replacing this with a macro defined thusly: #if defined(_MSC_VER) and defined(_M_IX86) #define IF_OVERFLOW_GOTO(X) __asm { jo X }; #else #define IF_OVERFLOW_GOTO(X) if ((i^a) < 0 && (i^b) < 0) goto X; #endif Would this case be an acceptable use of snippets of inline assembler?

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Weekly Python Bug/Patch Summary
by Skip Montanaro 09 Mar '03

09 Mar '03

Bug/Patch Summary ----------------- 349 open / 3432 total bugs (+7) 124 open / 2011 total patches (+1) New Bugs -------- Move modules out of Carbon (2003-03-02) http://python.org/sf/696206 PyMac_GetFSRef should accept unicode (2003-03-02) http://python.org/sf/696253 Carbon.CF module needs new style classes (2003-03-03) http://python.org/sf/696527 Python 2.4: Warn about omitted mutable_flag. (2003-03-03) http://python.org/sf/696535 How to make a class iterable using a member generator. (2003-03-03) http://python.org/sf/696777 CGIHTTPServer doesn't quote arguments correctly on Windows. (2003-03-03) http://python.org/sf/696846 gensuitemodule overhaul (2003-03-04) http://python.org/sf/697179 string.strip implementation/doc mismatch (2003-03-04) http://python.org/sf/697220 test_posix fails: getlogin (2003-03-04) http://python.org/sf/697556 string.atoi function causing TypeError (2003-03-04) http://python.org/sf/697591 Mention gmtime in Chapter 6.9 "Time access and conversions" (2003-03-05) http://python.org/sf/697983 Move gmtime function from calendar to time module (2003-03-05) http://python.org/sf/697985 Clarify timegm documentation (2003-03-05) http://python.org/sf/697986 Clarify daylight variable meaning (2003-03-05) http://python.org/sf/697988 Clarify mktime semantics (2003-03-05) http://python.org/sf/697989 Document strptime limitation (2003-03-05) http://python.org/sf/697990 __file__ attribute missing from dynamicly loaded module (2003-03-05) http://python.org/sf/698282 urllib2 Request.get_host and proxies (2003-03-05) http://python.org/sf/698374 Tk 8.4.2 and Tkinter.py _substitue function (2003-03-05) http://python.org/sf/698517 list.index() bhvr change > python2.x (2003-03-06) http://python.org/sf/698561 imaplib: parsing INTERNALDATE (2003-03-06) http://python.org/sf/698706 Provide "plucker" format docs. (2003-03-06) http://python.org/sf/698900 Error using Tkinter embeded in C++ (2003-03-06) http://python.org/sf/699068 HTMLParser crash on glued tag attributes (2003-03-06) http://python.org/sf/699079 Tutorial uses omitted slice indices before explaining them (2003-03-06) http://python.org/sf/699237 builtin type inconsistency (2003-03-07) http://python.org/sf/699312 ncurses/curses on solaris (2003-03-07) http://python.org/sf/699379 refcount problem involding debugger (2003-03-07) http://python.org/sf/699594 MIMEText's c'tor adds unwanted trailing newline to text (2003-03-07) http://python.org/sf/699600 Erroneous error message from IDLE (2003-03-07) http://python.org/sf/699630 Canvas Widget origin is off-screen (2003-03-07) http://python.org/sf/699816 Obscure error message (2003-03-08) http://python.org/sf/699934 site.py should ignore trailing CRs in .pth files (2003-03-08) http://python.org/sf/700055 New Patches ----------- allow proxy server authentication with pimp (2003-03-02) http://python.org/sf/696392 fix bug #670311: sys.exit and PYTHONINSPECT (2003-03-04) http://python.org/sf/697613 optparse unit tests + fixes (2003-03-05) http://python.org/sf/697939 optparse OptionGroup docs (2003-03-05) http://python.org/sf/697941 docs for hotshot module (2003-03-05) http://python.org/sf/698505 ZipFile - support for file decryption (2003-03-06) http://python.org/sf/698833 Closed Bugs ----------- threads within an embedded python interpreter (2000-11-03) http://python.org/sf/221327 unreliable file.read() error handling (2002-02-23) http://python.org/sf/521782 Flawed fcntl.ioctl implementation. (2002-05-14) http://python.org/sf/555817 Get rid of etype struct (2002-08-06) http://python.org/sf/591586 email 2.4.3 pkg mail header error (2002-10-16) http://python.org/sf/624254 email incompatibility upgrading to 2.2.2 (2002-10-20) http://python.org/sf/626119 HeaderParseError: no header value (2002-11-04) http://python.org/sf/633550 Optional argument for dict.pop() method (2002-11-17) http://python.org/sf/639806 email.Header misparses mixed headers (2002-11-18) http://python.org/sf/640110 datetime docs need review, LaTeX (2002-12-16) http://python.org/sf/654846 long(3.1415) gives zero on Solaris 8 (2003-02-03) http://python.org/sf/679520 Header loses lines, formats strangely (2003-02-03) http://python.org/sf/679827 Carbon.CF.CFString should require ASCII (2003-02-07) http://python.org/sf/682215 email: preamble must be \n terminated (2003-02-07) http://python.org/sf/682504 socket module on solaris (2003-02-11) http://python.org/sf/684903 IDE asks for attention when quitting (2003-02-11) http://python.org/sf/684975 robotparser only applies first applicable rule (2003-02-20) http://python.org/sf/690214 register command not listed in command line help (2003-02-20) http://python.org/sf/690389 can't build bsddb for 2.3a2 (2003-02-20) http://python.org/sf/690419 LibRef 4.2.1: {m,n} description update (2003-02-23) http://python.org/sf/692016 tkinter.createfilehandler dumps core (2003-02-24) http://python.org/sf/692416 licence allowed, but doesn't work (2003-02-25) http://python.org/sf/693470 Can't multiply str and bool (2003-02-26) http://python.org/sf/693955 email.Parser trashes header (2003-02-26) http://python.org/sf/693996 os.popen() hangs on {Free,Open}BSD (2003-02-26) http://python.org/sf/694062 complex_new does not always respect subtypes (2003-03-01) http://python.org/sf/695651 Closed Patches -------------- More DictMixin (2003-01-14) http://python.org/sf/667730 test_pty hanging on hpux11 (2003-01-20) http://python.org/sf/671384 Make the default encoding provided on Windows (2003-01-21) http://python.org/sf/671666 unicode support for os.listdir() (2003-02-09) http://python.org/sf/683592 Allow freeze to exclude implicits (2003-02-11) http://python.org/sf/684677 Use datetime in _strptime (2003-02-23) http://python.org/sf/691928 fix for bug 639806: default for dict.pop (2003-02-26) http://python.org/sf/693753

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VERSION in getpath.c
by Chris Johns 09 Mar '03

09 Mar '03

Hello, First, I am new to Python so I hope this is the correct place to post this type of question. I am playing with embedding Python 2.3a and I am tring to get importing to work. I have noticed the following in module_search_path : /tftpboot/lib/python21.zip /python/lib/python2.1/lib-dynload The 2.1 comes from the VERSION label at the start of getpath.c. Should this be PACKAGE_VERSION ? Regards -- Chris Johns, cjohns at cybertec.com.au

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Re: acceptability of asm in python code?
by Mats Wichmann 08 Mar '03

08 Mar '03

> >In the BINARY_ADD opcode, and in most arithmetic opcodes, there is a line >that checks for overflow that looks like this: > >if ((i^a) < 0 && (i^b) < 0) goto slow_add; > >I got a small speedup by replacing this with a macro defined thusly: > >#if defined(_MSC_VER) and defined(_M_IX86) >#define IF_OVERFLOW_GOTO(X) __asm { jo X }; >#else >#define IF_OVERFLOW_GOTO(X) if ((i^a) < 0 && (i^b) < 0) goto X; >#endif > >Would this case be an acceptable use of snippets of inline assembler? I'd personally be more comfortable if we didn't go down that road; there are compilers that don't support asm's (e.g. the Intel Linux compilers).

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Internationalizing domain names
by Martin v. Löwis 08 Mar '03

08 Mar '03

IETF has recently published a series of RFCs to support non-ASCII characters in domain names. This is called IDNA, Internationalizing domain names in applications. It works by applications converting Unicode domain names into ASCII ones (using an ACE, ASCII compatible encoding), which are then send to the DNS. I have implemented this technology for Python, and would like to see it included in Python 2.3. It consists of the following pieces: - Tools/unicode/mkstringprep.py, which generates Lib/stringprep.py from the source of RFC 3454, - Lib/encodings/punycode.py, patch 632643, implementing RFC 3492, - Lib/encodings/idna.py, implementing both RFC 3493 (nameprep) and RFC 3490 (idna) - modifications to the socket module, to accept Unicode for host names, and convert it using IDNA. - various test cases Changes to httplib, ftplib, etc are not necessary, as they just pass the host names through to the socket calls. I have no changes to the urllib* modules, as the work on IRIs (internationalized resource identifiers) is still in progress. As the result, if one puts non-ASCII into just the hostname part of an URL, urllib will do the right thing; urllib2 will complain about the non-ASCII characters. Would anybody like to review these changes? Regards, Martin

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[2.3a2+] Change in int() behavior
by David Abrahams 07 Mar '03

07 Mar '03

The following change in behavior is causing one of my tests to fail. Is it intentional? Should isinstance(int(x),int) really ever return False? $ python Python 2.2.2 (#1, Feb 3 2003, 14:10:37) [GCC 3.2 20020927 (prerelease)] on cygwin Type "help", "copyright", "credits" or "license" for more information. >>> import sys >>> int(sys.maxint * 2) Traceback (most recent call last): File "<stdin>", line 1, in ? OverflowError: long int too large to convert to int >>> exit 'Use Ctrl-D (i.e. EOF) to exit.' >>> dave@penguin ~ $ /usr/local/pydebug/bin/python Python 2.3a2+ (#1, Feb 24 2003, 15:02:10) [GCC 3.2 20020927 (prerelease)] on cygwin Type "help", "copyright", "credits" or "license" for more information. >>> import sys [17514 refs] >>> int(sys.maxint * 2) 4294967294L [17613 refs] >>> -- Dave Abrahams Boost Consulting www.boost-consulting.com

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super() bug (?)
by Samuele Pedroni 07 Mar '03

07 Mar '03

>>> class C(object): ... def f(self): pass ... >>> class D(C): pass ... >>> D.f <unbound method D.f> >>> super(D,D).f <bound method D.f of <class '__main__.D'>> I think this should produce the same thing as D.f, that means implementation-wise f.__get__(None,D) should be called not f.__get__(D,D). _.__get__(None,D) would still do the right thing for static AND class methods: >>> def g(cls): pass ... >>> classmethod(g).__get__(None,D) <bound method type.g of <class '__main__.D'>>

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