Mailman 3 June 2004 - Python-Dev

Stackless Python
by Eyal Lotem June 17, 2004

June 17, 2004

Stackless Python and its tasklets would be great! Why is Python still not stackless? __________________________________ Do you Yahoo!? Friends. Fun. Try the all-new Yahoo! Messenger. http://messenger.yahoo.com/

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RE: [Python-Dev] Comparing heterogeneous types
by Chermside, Michael June 17, 2004

June 17, 2004

Jeff Epler writes: > Can't you do it like so: > def cmp_long_vs_float(l, f): > try: > lf = float(l) > except OverflowError: > if special_float_value(f): # NaN, Inf > return cmp(0.0, f) > return cmp(l, 0L) > else: > return cmp(lf, f) I don't think so. There are three "problems" with comparing floats to longs. The float might have a fraction part (not be an integer), in which case we really need pay attention to it (perhaps by comparing floats). The long might be larger than the largest float, in which case we really need to pay attention to THAT (perhaps by comparing longs). Your code handles these. But there's another situation too... the long could be less than MAX_FLOAT, but still not be precisely representably as a float. In a case like this, we really need to convert both to longs and compare (or something equivalent) and your code fails to do this. What Andrew Koenig was suggesting (and I hope I'm understanding it properly, since I'd never realized this fact before I read his post) is that for any (sane) implementation of float, there is a crossover value. Below that value, the precision is larger than the exponent and there might be a fractional part. Above that value, the precision is smaller than the exponent, and so floats above that value must all be integers... and some integers above that value will not be representable as floats. Andrew's suggestion is to (losslessly) convert both to floats and compare if the float is below that value, and (losslessly) convert both to longs and compare if the float is above that value. The only bit that seems tricky to me is determining the crossover value in pure C. How do we do that? -- Michael Chermside This email may contain confidential or privileged information. If you believe you have received the message in error, please notify the sender and delete the message without copying or disclosing it.

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Downloadable HTML from the trunk
by Fred L. Drake, Jr. June 17, 2004

June 17, 2004

I've changed the script I use to update the online version of the development docmentation so that when that's updated, a copy of the tarball is kept available for download. Both the online and downloadable forms of the development documentation are at: http://www.python.org/dev/doc/ -Fred -- Fred L. Drake, Jr. <fdrake at acm.org> PythonLabs at Zope Corporation

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RE: [Python-Dev] Candidate Itertools
by Chermside, Michael June 17, 2004

June 17, 2004

[Michael Chermside] > Is the behavior of count_elements() exactly the same as > the given python equivalent when one (or more) of the > elements in the iterable is not hashable? [Raymond Hettinger] > That was the original idea; however, we could easily keep a separate > list of identity comparisons for unhashables If you do indeed handle unhashables, then I think this interface seems useful, although I'd order it (elem, cnt) so that when everything IS hashable a dict can be built via dict(*count_elements(iterable)) If you do NOT handle unhashables, then I'd agree with Bob that we should just return the dict itself -- that's the most natural data structure for expressing a bunch of counts available in Python. And I think the function is worth including. -- Michael Chermside This email may contain confidential or privileged information. If you believe you have received the message in error, please notify the sender and delete the message without copying or disclosing it.

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Weekly Python Bug/Patch Summary
by Kurt B. Kaiser June 17, 2004

June 17, 2004

Patch / Bug Summary ___________________ Patches : 276 open ( +2) / 2415 closed (+14) / 2691 total (+16) Bugs : 741 open (-21) / 4156 closed (+62) / 4897 total (+41) RFE : 140 open ( +2) / 129 closed ( +1) / 269 total ( +3) New / Reopened Patches ______________________ Fix to minor spelling error in exception in int_subtype_new (2004-06-05) CLOSED http://python.org/sf/967057 opened by Aaron Brady fix bsddb memory leaks (2004-06-06) http://python.org/sf/967763 opened by Neal Norwitz Add fileinput.islastline() (2004-06-07) http://python.org/sf/968063 opened by Relm Arrowny Py_HUGE_VAL HUGE_VAL HUGE undefined (2004-06-08) http://python.org/sf/968728 opened by Michael Schloh von Bennewitz hotshot incorrectly computes elapsed time (2004-06-08) CLOSED http://python.org/sf/969180 opened by Jason Beardsley heapq.nlargest (2004-06-09) CLOSED http://python.org/sf/969791 opened by Raymond Hettinger str(a_tuple) == str(tuple(map(str,a_tuple))) (2004-06-09) CLOSED http://python.org/sf/969805 opened by Grégoire Dooms cookielib doc minor corrections and clarifications (2004-06-09) http://python.org/sf/969900 opened by John J Lee cookielib.py (2004-06-09) http://python.org/sf/969907 opened by John J Lee Generate a working spec even with wrong version of software (2004-06-10) http://python.org/sf/970015 opened by Scherer Michael Use a better BuildRoot tag (2004-06-10) http://python.org/sf/970019 opened by Scherer Michael Fix for #876637 - Random stack corruption from socketmodule (2004-06-10) http://python.org/sf/970288 opened by Troels Walsted Hansen Patch for feature request 491033 (2004-05-20) http://python.org/sf/957240 reopened by mwh make test_signal less annoying (2004-06-11) CLOSED http://python.org/sf/971323 opened by Michael Hudson urllib2 handler algorithm docs (2004-06-13) http://python.org/sf/972310 opened by John J Lee urllib2 handler naming convention collision (2004-06-14) http://python.org/sf/972322 opened by John J Lee urllib2 FTPHandler bugs (2004-06-14) http://python.org/sf/972332 opened by John J Lee fix build of docs in info format (2004-06-15) http://python.org/sf/972991 opened by Matthias Klose Fix for compilation with runtime_library_dirs (2004-06-15) http://python.org/sf/973204 opened by Antti Honkela Patches Closed ______________ deprecate or fix buffer object (2003-10-28) http://python.org/sf/832058 closed by nascheme cygwinccompiler should set C++ compiler (2004-02-02) http://python.org/sf/888839 closed by perky Rewrite of site.py (2004-03-23) http://python.org/sf/921793 closed by bcannon Fix to minor spelling error in exception in int_subtype_new (2004-06-05) http://python.org/sf/967057 closed by akuchling CodeContext - an extension to show you where you are (2004-04-16) http://python.org/sf/936169 closed by kbk Tk Dialog Upon Subprocess Socket Error (2003-07-26) http://python.org/sf/778323 closed by kbk _socket fails to build with latest SGI compiler (2004-01-27) http://python.org/sf/885905 closed by nnorwitz cycle profiler for VM opcodes (2002-01-30) http://python.org/sf/510695 closed by loewis making Python LC_NUMERIC agnostic (2003-07-20) http://python.org/sf/774665 closed by loewis hotshot incorrectly computes elapsed time (2004-06-08) http://python.org/sf/969180 closed by nnorwitz str(a_tuple) == '(%s)'%', '.join(map(str,a_tuple)) (2004-06-09) http://python.org/sf/969805 closed by dooms Add nlargest() and nsmallest() to heapq. (2004-06-09) http://python.org/sf/969791 closed by rhettinger make test_signal less annoying (2004-06-11) http://python.org/sf/971323 closed by mwh cmath.log optional base argument, fixes #823209 (2003-10-18) http://python.org/sf/826074 closed by rhettinger Crash in binascii_a2b_uu on corrupt data (2003-01-09) http://python.org/sf/665458 closed by nnorwitz Added Proxyauth command to imaplib (2002-11-14) http://python.org/sf/638673 closed by nnorwitz New / Reopened Bugs ___________________ cgitb.scanvars fails (2004-06-05) CLOSED http://python.org/sf/966992 opened by Robin Becker file("foo", "wU") is silently accepted (2004-06-05) http://python.org/sf/967182 opened by Skip Montanaro PythonWin fails reporting "Can not locate pywintypes23.dll (2004-06-05) CLOSED http://python.org/sf/967207 opened by puffingbilly Cmd in thread segfaults after Ctrl-C (2004-06-05) http://python.org/sf/967334 opened by Kevin M. Turner PyInt_FromString failed with certain hex/oct (2004-06-06) CLOSED http://python.org/sf/967657 opened by Qian Wenjie csv module cannot handle embedded \r (2004-06-07) http://python.org/sf/967934 opened by Gregory Bond file.encoding doesn't apply to file.write (2004-06-07) http://python.org/sf/967986 opened by Matthew Mueller Python Logging filename & file number (2004-06-07) http://python.org/sf/968245 opened by Ryan error flattening complex smime signed message (2004-06-07) http://python.org/sf/968430 opened by Ludovico Magnocavallo CJK codecs list incomplete (2004-06-08) http://python.org/sf/969415 opened by Mike Brown CJK codecs list incomplete (2004-06-09) http://python.org/sf/969415 reopened by perky Python hangs up on I/O operations on the latest FreeBSD 4.10 (2004-06-09) http://python.org/sf/969492 opened by _Iww_ BSD restartable signals not correctly disabled (2004-06-09) http://python.org/sf/969574 opened by Luke Mewburn BASECFLAGS are not passed to module build line (2004-06-09) http://python.org/sf/969718 opened by Jason Beardsley function and method objects confounded in Tutorial (2004-06-09) http://python.org/sf/969757 opened by Mark Jackson pydoc ignores module's __all__ attributes (2004-06-09) CLOSED http://python.org/sf/969938 opened by Skip Montanaro lfcntl.lockf() signature uses len, doc refers to length (2004-06-10) CLOSED http://python.org/sf/970042 opened by Clinton Roy 2.3.4 fails build on solaris 10 - complexobject.c (2004-06-10) http://python.org/sf/970334 opened by JD Bronson Generators produce wrong exception (2004-06-10) CLOSED http://python.org/sf/970459 opened by Anders Lehmann PyObject_GenericGetAttr is undocumented (2004-06-10) http://python.org/sf/970783 opened by Eric Huss Pyton 2.3.4 Make Test Fails on Mac OS X (2004-06-10) http://python.org/sf/970799 opened by D. Evan Kiefer Comparisons of unicode and strings shouldn (2004-06-11) CLOSED http://python.org/sf/971101 opened by Christian Theune Comparisons of unicode and strings raises UnicodeErrors (2004-06-11) CLOSED http://python.org/sf/971106 opened by Christian Theune bizarro test_asynchat failure (2004-06-11) CLOSED http://python.org/sf/971200 opened by Michael Hudson another threads+readline+signals nasty (2004-06-12) http://python.org/sf/971213 opened by Anthony Baxter test_timeout failure on trunk (2004-06-12) http://python.org/sf/971238 opened by Anthony Baxter test_signal sucks (2004-06-11) http://python.org/sf/971330 opened by Michael Hudson thread.name crashes interpreter (2004-06-11) CLOSED http://python.org/sf/971395 opened by Jonathan Ellis Wrong indentation of example code in tutorial (2004-06-12) CLOSED http://python.org/sf/971747 opened by Grégoire Dooms An apparent bug in help (2004-06-12) http://python.org/sf/971872 opened by Colin J. Williams Generator mangles returned lists. (2004-06-13) CLOSED http://python.org/sf/971962 opened by Ed Watkeys urllib2 raises exception with non-200 success codes. (2004-06-13) http://python.org/sf/971965 opened by Ed Watkeys local variables problem (2004-06-14) CLOSED http://python.org/sf/972467 opened by Toon Verstraelen Python 2.3.4, Solaris 7, socketmodule.c does not compile (2004-06-14) http://python.org/sf/972724 opened by Bruce D. Ray attached script causes python segfault (2004-06-15) CLOSED http://python.org/sf/972917 opened by Faheem Mitha bsddb in Python 2.3 incompatible with SourceNav output (2004-06-15) http://python.org/sf/973054 opened by gdy inspect.getframeinfo bug if 'context' is to big (2004-06-15) CLOSED http://python.org/sf/973092 opened by Hans Georg Krauthaeuser empty raise after handled exception (2004-06-15) http://python.org/sf/973103 opened by Niki Spahiev sys.stdout problems with pythonw.exe (2004-06-15) http://python.org/sf/973507 opened by Manlio Perillo Doc error on super(cls,self) (2004-06-15) http://python.org/sf/973579 opened by David MacQuigg Bugs Closed ___________ cgitb.scanvars fails (2004-06-05) http://python.org/sf/966992 closed by akuchling random.choice([]) should return more intelligible exception (2004-06-01) http://python.org/sf/964230 closed by rhettinger 2.3 inspect.getframeinfo wrong tb line numbers (2004-05-15) http://python.org/sf/954364 closed by akuchling xmlrpclib chokes on Unicode keys (2003-11-13) http://python.org/sf/841757 closed by akuchling HTMLParser ParseError in start tag (2004-03-23) http://python.org/sf/921657 closed by akuchling cgi module documentation could mention getlist (2004-05-13) http://python.org/sf/953177 closed by akuchling many os.path functions bahave inconsistently (2004-04-04) http://python.org/sf/929316 closed by akuchling pty.spawn() leaks file descriptors (2004-02-16) http://python.org/sf/897935 closed by akuchling PyNumber_InPlaceDivide()'s description (2004-04-17) http://python.org/sf/936837 closed by akuchling Py_FilesystemDefaultEncoding leaks (2004-04-17) http://python.org/sf/936915 closed by akuchling popen2 returns (out, in) not (in, out) (2004-03-18) http://python.org/sf/918710 closed by akuchling PythonWin fails reporting "Can not locate pywintypes23.dll (2004-06-05) http://python.org/sf/967207 closed by theller distutils - compiling C++ ext in cyg or mingw w/ std Python (2004-01-15) http://python.org/sf/877165 closed by perky distutils - compiling C++ ext in cyg or mingw w/ std Python (2004-01-15) http://python.org/sf/877165 closed by perky SSL bug in socketmodule.c using threads (2003-07-20) http://python.org/sf/774798 closed by akuchling cgi module should handle large post attack (2003-06-22) http://python.org/sf/758665 closed by akuchling CGIHTTPServer doesn't quote arguments correctly on Windows. (2003-03-03) http://python.org/sf/696846 closed by akuchling test_zlib is too slow (2004-05-26) http://python.org/sf/960995 closed by nascheme pickle protocol 2 is incompatible(?) with Cookie module (2004-06-02) http://python.org/sf/964868 closed by akuchling realpath description misleading (2004-06-03) http://python.org/sf/966256 closed by akuchling Multiple Metaclass inheritance limitation (2004-05-30) http://python.org/sf/963246 closed by pje Cookie module does not parse date (2004-06-02) http://python.org/sf/964861 closed by akuchling socket-module SSL is broken (2002-01-26) http://python.org/sf/508944 closed by akuchling mapping a 0 length file (2004-06-02) http://python.org/sf/964876 closed by tim_one bug? in PyImport_ImportModule under AIX (2002-03-12) http://python.org/sf/528990 closed by akuchling Build fails in _curses module (2002-04-24) http://python.org/sf/548109 closed by akuchling os.mkdir() handles SETGID inconsistently (2002-04-05) http://python.org/sf/539942 closed by akuchling Interpreter won't always exit with daemonic thread (2001-12-17) http://python.org/sf/494203 closed by akuchling build problems on DEC Unix 4.0f (2002-05-30) http://python.org/sf/562585 closed by akuchling canvas.create_box() crashes Tk thread (2002-10-22) http://python.org/sf/626936 closed by akuchling tarfile fails on MacOS9 (2003-02-20) http://python.org/sf/690341 closed by akuchling macfs and macostools tests fail on UFS (2004-05-29) http://python.org/sf/962633 closed by mondragon segfault in subclassing datetime.date & pickling (2004-05-12) http://python.org/sf/952807 closed by tim_one Error in obmalloc. (2004-01-21) http://python.org/sf/881641 closed by nnorwitz binascii.a2b_base64 with non base64 data (2002-12-19) http://python.org/sf/656392 closed by nnorwitz PyInt_FromString failed with certain hex/oct (2004-06-07) http://python.org/sf/967657 closed by anthonybaxter getsockopt/setsockopt with SO_RCVTIMEO are inconsistent (2003-03-11) http://python.org/sf/701936 closed by nnorwitz add a stronger PRNG (2004-03-15) http://python.org/sf/917055 closed by rhettinger distutils/mingw32 links to dbg libs (2001-08-22) http://python.org/sf/454086 closed by akuchling Python crashes when __init__.py is a directory. (2003-11-20) http://python.org/sf/845802 closed by theller PyBuffer_New() memory not aligned (2001-10-18) http://python.org/sf/472568 closed by nascheme Tix not included in windows distribution (2001-10-25) http://python.org/sf/474836 closed by loewis CJK codecs list incomplete (2004-06-09) http://python.org/sf/969415 closed by perky pydoc ignores module's __all__ attributes (2004-06-09) http://python.org/sf/969938 closed by montanaro Generators produce wrong exception (2004-06-10) http://python.org/sf/970459 closed by anders_lehmann Comparisons of unicode and strings shouldn (2004-06-11) http://python.org/sf/971101 closed by ctheune Comparisons of unicode and strings raises UnicodeErrors (2004-06-11) http://python.org/sf/971106 closed by lemburg execfile -> type() created objects w/ no __module__ error (2004-06-05) http://python.org/sf/966623 closed by anthonybaxter asyncore sillies (2004-06-11) http://python.org/sf/971200 closed by mwh thread.name crashes interpreter (2004-06-11) http://python.org/sf/971395 closed by tim_one test_unicode_file fails on Win98SE (2004-03-28) http://python.org/sf/924703 closed by loewis Wrong indentation of example code in tutorial (2004-06-12) http://python.org/sf/971747 closed by rhettinger Generator mangles returned lists. (2004-06-12) http://python.org/sf/971962 closed by rhettinger fcntl.lockf() signature uses len, doc refers to length (2004-06-09) http://python.org/sf/970042 closed by nnorwitz Assignment to __builtins__.__debug__ doesn't do anything. (2003-12-18) http://python.org/sf/862600 closed by rhettinger cmath.log doesn't have the same interface as math.log. (2003-10-13) http://python.org/sf/823209 closed by rhettinger local variables problem (2004-06-14) http://python.org/sf/972467 closed by tim_one attached script causes python segfault (2004-06-15) http://python.org/sf/972917 closed by perky inspect.getframeinfo bug if 'context' is to big (2004-06-15) http://python.org/sf/973092 closed by rhettinger sys.getfilesystemencoding() (2004-06-02) http://python.org/sf/964870 closed by loewis Listbox itemconfigure leaks memory (2003-08-02) http://python.org/sf/781883 closed by nnorwitz PyObject_Free unallocated memory read warning (2003-08-04) http://python.org/sf/782689 closed by nnorwitz New / Reopened RFE __________________ pty.spawn() enhancements (2004-06-05) http://python.org/sf/967161 opened by A.M. Kuchling Better SSL support in socket module (2004-06-05) http://python.org/sf/967275 opened by A.M. Kuchling RFE Closed __________ os.nullfilename (2004-04-15) http://python.org/sf/935915 closed by loewis

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hx string -> int
by Patrick June 16, 2004

June 16, 2004

if you had a hex string like '0x7c' how would you convert it to an int? int(0x7c) works, but not int('0x7c')

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PEP 327 (Decimal data type) updated and status
by Batista, Facundo June 16, 2004

June 16, 2004

There's a new version of the PEP at http://www.python.org/peps/pep-0327.html This one includes a lot of fixes, the results of the last discussion in python-dev, and a new section: Documentation, which includes all the methods and attributes available (with examples!). Enjoy it! Any feedback is welcomed. This PEP was send to a re-review to Tim Peters. In parallel, I continued to work on the code. When Tim approves the PEP, I'll make the code and test cases comply with it. I'll let you know when I finish. Thank you! . Facundo

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RE: [Python-Dev] Candidate Itertools
by Chermside, Michael June 16, 2004

June 16, 2004

Raymond Hettinger writes: > Feedback is requested for two prospective itertools: > > def count_elements(iterable): > b = {} > for elem in iterable: > b[elem] = b.get(elem, 0) + 1 > return ((cnt, elem) for elem, cnt in b.iteritems()) Is the behavior of count_elements() exactly the same as the given python equivalent when one (or more) of the elements in the iterable is not hashable? -- Michael Chermside This email may contain confidential or privileged information. If you believe you have received the message in error, please notify the sender and delete the message without copying or disclosing it.

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PEP 310 - A standard way to wrap objects?
by Nick Coghlan June 16, 2004

June 16, 2004

After the recent discussion of resource acquisition, I went back and read PEP 310 again myself. Something that I wondered was whether it would be possible to include in the PEP a generic wrapper function that could be used inline in the 'with' statement. That is, instead of resource control via lots of throwaway subclasses like this: class Resource_Foo(Foo): __exit__ = foo_done with myFoo = Resource_Foo(args): # Do stuff We would have: with myFoo = resource(Foo(args), Foo.foo_done): # Do stuff or with myFile = resource(file("bar.txt"), file.close): # Do stuff or my_bar = Bar() with resource(my_bar, my_bar.start, my_bar.stop): # Do stuff Having a recommended way to wrap objects which don't support the 'with' protocol natively would seem to be better than having everyone invent there own methodology. Possible definition for the 'resource' function (this mechanism for adding the relevant methods has been tested in Python 2.2): def resource(obj, get_resource=None, free_resource): # Set up the enter method (if there is one) if get_resource: enter_obj = getattr(enter_meth, "im_self", None) if not enter_obj: # It's a function or unbound method obj.__enter__ = lambda: get_resource(obj) elif enter_obj is obj: # It's a bound method of our object obj.__enter__ = get_resource else: raise ValueError("Resource and bound enter method do not match") # Set up the exit method if not getattr(free_resource, "im_self", None): # It's a function or unbound method obj.__exit__ = lambda: free_resource(obj) elif free_resource.im_self is obj: # It's a bound method of our object obj.__exit__ = free_resource else: raise ValueError("Resource and bound exit method do not match") # Return the object so that we can use the assignment # form of the 'with' statement return obj Regards, Nick. -- Nick Coghlan Brisbane, Australia

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RE: [Python-Dev] Object finalization for local (ie function) scopes
by Moore, Paul June 16, 2004

June 16, 2004

From: Oliver Schoenborn >> However, this is probably the time to ask for a PEP that properly >> describes the API and the semantics of the feature. > In time... I'd like a couple more opinions if possible. I'm > surprised there hasn't been more given how fundamental the problem > of RAII is in Python. It's not at all clear that there *is* a "problem of RAII" in Python. Regardless, you may want to look at PEP 310, and the (extensive) threads on python-dev which it spawned, for an alternative view of the issue. >From my perspective, the RAII idiom is a very nice approach in C++, but it's not at all clear if it can be made to translate cleanly into Python, for fundamental semantic reasons (C++ deallocates on scope exit, regardless of outstanding references, which creates the issue of dangling reference, but makes RAII possible). The things I like about RAII: 1. Resource management is concentrated in one place, the creation of the object. (OK, the object's class definition needs to contain the acquisition and release code, but that's normal encapsulation, IMO). 2. First-in, last-out ordering is enforced by the scope rules of the language. 3. Timing issues over windows where interrupts can result in acquired resources not being released, or partially-acquired resources being released, are avoided by the language's semantics of initialisation. PEP 310 addresses points (1) and (3) - although (3) is only alluded to in the "Implementation notes" section, and isn't clearly stated as a required feature of the construct in the main PEP body. Point (2) is the one that often causes code to look most "messy". Nested try/finally (or PEP 310 with) blocks can obscure code structure. Consider lock.acquire() try: f = open(...) try: something_else.reserve() try: # The real code goes here! finally: something_else.release() finally: f.close() finally: lock.release() However, the general consensus seems to be (a) that such code needs refactoring into separate functions, each of which only acquires a single resource, and (b) that if you *really* need to acquire 3 resources like this, you can write a user-defined class which encapsulates this need as a "combined" resource: class StuffINeed: "Missing code to handle failures during __enter__ or __exit__" def __init__(self, lock, something_else): self.lock = lock self.something_else = something_else self.f = None def __enter__(self): "PEP 310 method" self.lock.acquire() self.f = open(...) self.something_else.reserve() def __exit__(self): "PEP 310 method" self.something_else.release() self.f.close() self.lock.release() [Because of the "Missing code..." comment, a generalised version of such a class may be a useful addition to the standard library in combination with PEP 310] Sorry - that went on longer than anticipated. To summarise, I think you should consider whether PEP 310 is what you need (it's probably mode Pythonic than overloading __del__ the way C++ does), and if so, put your energy into assisting the progress of that PEP. Paul. __________________________________________________________________________ This e-mail and the documents attached are confidential and intended solely for the addressee; it may also be privileged. If you receive this e-mail in error, please notify the sender immediately and destroy it. As its integrity cannot be secured on the Internet, the Atos Origin group liability cannot be triggered for the message content. Although the sender endeavours to maintain a computer virus-free network, the sender does not warrant that this transmission is virus-free and will not be liable for any damages resulting from any virus transmitted. __________________________________________________________________________

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