Mailman 3 June 2004 - Python-Dev

RE: [Python-Dev] Comparing heterogeneous types
by Chermside, Michael June 25, 2004

June 25, 2004

Armin Rigo writes: > Is it really what we want? It seems to me that the precision > of a float gives > roughly the magnitude of "uncertainty" of the value that it > represents. If a > float is large enough, then the same float can represent > several long integer > values. It should then probably be considered equal to any > of these integers, > instead of just equal to the one arbitrarily returned by > casting it to long. I think that what you describe is NOT the behavior that we want, and I'll try to give an explanation of why. But please bear with me... I'm still a beginner at understanding some of the theory behind numerical computing, so I may make some mistakes. Hopefully those who understand it better will correct me. It's a fact that only certain numbers can be represented exactly when using numbers of finite precision. For instance, floating point numbers where the exponent is larger than the number of digits of precision can represent certain integers but not others. The same situation arises in the use of floating (or fixed) point decimals -- only certain fractions can be expressed exactly. There are (at least) two different mental models we can use to deal with this limitation of finite precision. One (which you are espousing above) is to treat each limited-precision number as if it had an inherent uncertainty, and it represented all those numbers which are closer to that representable number than any other. The other mental model is to suppose that each limited-precision number represents just one specific value and that the other values simply cannot be represented. I always understand things better when I have concrete examples, so let me use numbers in base 10 with a precision of 3 to illustrate these two viewpoints. With a precision of 3 we can write out the values 2.34x10^4 for the number 23,400 and 2.35x10^4 for the number 23,500. But 23,401, 23,402, and all the others in between can't be represented. So by the "Error bar" mental model, we think of "2.34x10^4" as shorthand for "some number from 23,350 to 23,450". By the "Exact values" mental model we think of "2.34x10^4" as meaning "The exact value 23,340". Now that we know there are two different mental models, we have to wonder whether one is inherently better than the other (and whether it makes any difference). I maintain that it DOES make a difference, and that the "Exact values" mental model is BETTER than the "Error bar" model. The reason why it is better doesn't come into play until you start performing operations on the numbers, so let's examine that. Suppose that you are adding two numbers under the "Exact values" mental model. Adding 1.23x10^4 and 3.55x10^4 is quite easy... the exact sum of 12,300 and 35,500 is 47,800 or 4.78x10^4. But if we add 1.23x10^4 and 8.55x10^2, then the "real" sum is 12,300 + 855 = 13,155. That CAN'T be represented in the "exact values" mental model, so we have to ROUND IT OFF and store "1.32x10^4" instead. In general, the values are quite clear in the "Exact values" model, but OPERATIONS may require rounding to express the result. Proponents of the "Error bar" mental model are now thinking "yes, well our model trades complexity of VALUES for simplicity in OPERATIONS". But unfortunately that's just not true. Again, let us try to add 1.23x10^4 and 3.55x10^4. What that REALLY means (in the "Error bar" mental model) is that we are adding SOME number in the range 12,250..12,350 to SOME number in the range 35,450..35,550. The result must be some number in the range 47,700..47,900. That is LIKELY to belong to the range 47,750..47,850 (ie 4.78x10^4), but it MIGHT also come out to something in the 4.77x10^4 range or the 4.79x10^4 range. We intent to return a result of 1.78x10^4, so operations in the "Error bar" mental model aren't simple, but contain some sort of "rounding off" as well, only the exact rules for how THIS "rounding off" works are a bit more confusing -- I'm not sure I could express them very well. (Side Note: You might think to fix this problem by saying that instead of perfect ranges, the numbers represent probability curves centered around the given number. By using gaussian curves, you might even be able to make addition "simple" (at the cost of a very complex idea of "values"). But whatever distribution worked for addition would NOT work for multiplication or other operations, so this trick is doomed to failure.) So it turns out that WHATEVER you do, operations on finite- precision numbers are going to require some sort of a "rounding off" step to keep the results within the domain. That being said, the "Exact values" mental model is superior. Not only does it allow a very simple interpretation of the "values", but it *also* allows the definition of "rounding off" to be part of the definition of the operations and not be linked to the values themselves. (For instance, I prefer a simple "round-to-nearest" rule, but someone else may have a different rule and that only affects how they perform operations.) It is for this reason that (I think) most serious specifications for the behavior of finite-precision numbers prefer to use the "Exact value" mental model. (Another side note: You will notice that the argument here is strikingly similar to the behavior of PEP 327's Decimal type. That's because I learned just about everything I'm saying here from following the discussions (and doing the recommended reading) about Facundo's work there.) Okay, in my long-winded fashion, I may have shown that the "Exact values" mental model is superior to the "Error bars" model. But does it really make any difference to anyone other than writers of numerical arithmetic specifications? It does, and one of the best examples is the one that started this conversation... comparing instances of different numerical types. I maintain that when comparing a long with a float where the exponent is larger than the precision, that the float should be treated as if it were EXACTLY EQUAL TO <coefficient>*2^<exponent>, instead of trying to treat it as some sort of a range. Similarly, if we implemented a Rational type, I would suggest that instances of float (or of Facundo's Decimal) where <exponent> is LESS than the digits of <coefficient> should be treated as if they were EXACTLY EQUAL TO the corresponding fraction-over-a-power-of-two. All right, those who ACTUALLY understand this stuff (rather than having learned it from this newsgroup) can go ahead and correct me now. Once-a-teacher,-always-trying-to-give-a-lecture-lly yours, -- 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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RE: [Python-Dev] A better popen2
by Moore, Paul June 25, 2004

June 25, 2004

From: P(a)draigBrady.com > I've written a couple of apps that required > running a command and grabbing the output, > and I've found the existing interfaces problematic for this. You're not the only one who has found this. Have a look at PEP 324. > Therefore I bit the bullet and wrote my own, > with as simple an interface as I thought possible: > http://www.pixelbeat.org/libs/subProcess.py > Perhaps this could be included in commands.py for e.g.? As it stands, this looks like it is Unix-only, which would probably be an issue for a standard library function. 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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A better popen2
by P＠draigBrady.com June 25, 2004

June 25, 2004

I've written a couple of apps that required running a command and grabbing the output, and I've found the existing interfaces problematic for this. I think the proliferation of functions and classes in the popen2 module illustrates the problem (popen2.{popen2,popen3,popen4,Popen3,Popen4}) Now if I want to read both stdout and stderr seperately then it's awkward to say the least to implement that without deadlocking using the popen2 module. Also the multiplexing of stdout and stderr in popen4 and commands.getoutput is not usually what one requires IMHO. There are external solutions like the getCommandOutput recipe: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52296 which has problems that I've commented on there. There are also very complex solutions like "subproc" from Ken Manheimer and "task" from Rob Hooft Therefore I bit the bullet and wrote my own, with as simple an interface as I thought possible: http://www.pixelbeat.org/libs/subProcess.py Perhaps this could be included in commands.py for e.g.? Any comments appreciated. cheers, Pádraig. p.s. sorry about the previous case of trigger finger

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logging vs warnings?
by Gustavo J. A. M. Carneiro June 25, 2004

June 25, 2004

Why do we have modules logging(2.3) and warnings(2.1)? Does 'logging' deprecate 'warnings' in any way? I know this question doesn't belong in this list. I appreciate any clarifications anyway. Thanks in advance. Regards. -- Gustavo J. A. M. Carneiro <gjc(a)inescporto.pt> <gustavo(a)users.sourceforge.net> The universe is always one step beyond logic

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NOP
by Raymond Hettinger June 24, 2004

June 24, 2004

Any objections to my adding a NOP instruction to support additional code generation improvements in Python/compile.c? One possible improvement is replacing [UNARY_NOT JUMP_IF_FALSE addr] with [NOP JUMP_IF_TRUE addr]. Raymond

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lvalue casts in pyrexc
by Jon Oberheide June 24, 2004

June 24, 2004

Greetings, I apologize if this has already been discussed or implemented in CVS but I am not up to date on python development. With the release of GCC 3.4 and the continuing development of GCC 3.5, lvalue casts in C are being deprecated. Fortunately GCC 3.4 only spits out a warning for them. Unfortunately, us crazies using 3.5 will encounter an unfriendly error with the lvalue casts generated by pyrexc. Any information on this issue would be appreciated...thanks! PS: please CC me as I'm not subscribed Regards, Jon Oberheide jon(a)focalhost.com

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Weekly Python Bug/Patch Summary (2nd try)
by kbk＠shore.net June 24, 2004

June 24, 2004

[The first posting of this report has not appeared on python-dev though it was accepted by the mail server 20 hrs ago] Jun 16 23:48:24 hydra sm-mta[21306]: i5H3m2l6025771: to=<python-dev(a)python.org>, d elay=00:00:22, xdelay=00:00:22, mailer=esmtp, pri=30371, relay=mail.python.org. [1 2.155.117.29], dsn=2.0.0, stat=Sent (OK id=1Bansp-0001jb-Kg) 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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popen2 problems
by P＠draigBrady.com June 24, 2004

June 24, 2004

-- Pádraig Brady - http://www.pixelbeat.org --- Following generated by rotagator --- For useful non obvious keyboard bindings to various linux apps, see: http://www.pixelbeat.org/lkdb/ --

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test_profile failing (yes, I know)
by Nick Bastin June 24, 2004

June 24, 2004

Before anybody else sends me email.. ;-) Yes, I know test_profile currently fails if you don't build with --with-c-profiling. I'll fix the test as soon as I can. -- Nick

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Possible addition to itertools
by Scott David Daniels June 24, 2004

June 24, 2004

One feature that I'd find nice in itertools is access to "universal newlines" behavior. This would make it much easier to extend zipfile and other compression-related code to provide pseudo-files that iterate properly. To try out a simple Python equivalent, look at: http://members.dsl-only.net/~daniels/ilines.html If people think such code would be useful in itertools, I'd be happy to add it as a patch. If not, I'll provide it as a Cookbook recipe or some such. -- -- Scott David Daniels Scott.Daniels(a)Acm.Org

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