Mailman 3 January 2008 - Python-Dev

Coverity Scan, Python upgraded to rung 2
by Jim Jewett Jan. 11, 2008

Jan. 11, 2008

Neal Norwitz wrote: >> For codeobject.c, line 327 should not be reachable. ... Christian Heimes wrote: > Please suppress the warning. I removed the last > two lines and GCC complained ... Either way, it would be worth adding a comment to the source code so this doesn't come up again. -jJ

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PySequence_Concat for dicts
by Jared Flatow Jan. 11, 2008

Jan. 11, 2008

Hi all, I am fairly new to the Python community so please forgive me (and correct me) if I am going about this wrong. I think it would be convenient and pythonic if dict objects implemented the PySequence_Concat method. I see there was once a short-lived discussion about this here: http://mail.python.org/pipermail/patches/2004-March/014323.html I have also been following the discussion about contributing to Python. It seems to me that this would be a fairly easy feature to implement (perhaps naively?), and I would be glad to try writing a patch for this if there is at least some chance of it making it into one of the branches. Can someone please advise me on what the correct order for going about this would be? Do I need to first write a PEP justifying why I think it would be an improvement? Which version of Python (if any), should a patch be targeted at? Otherwise, is there a good reason dicts do not already implement this method? I somewhat understand the complaint about commutativity, but as mentioned in the previous discussion, list concatenation is not commutative either. Seeing as update is the only builtin method for concatenation of dicts in the first place, it doesn't seem all that confusing that 'summing' two dicts should conveniently return a new instance that is the (only form of) concatenation of the two dicts. regards, jared

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Summary of Tracker Issues
by Tracker Jan. 11, 2008

Jan. 11, 2008

ACTIVITY SUMMARY (01/04/08 - 01/11/08) Tracker at http://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue number. Do NOT respond to this message. 1323 open (+31) / 11946 closed (+18) / 13269 total (+49) Open issues with patches: 436 Average duration of open issues: 674 days. Median duration of open issues: 951 days. Open Issues Breakdown open 1309 (+31) pending 14 ( +0) Issues Created Or Reopened (51) _______________________________ documentation on metaclasses is incomplete and misleading 01/05/08 CLOSED http://bugs.python.org/issue1734 reopened georg.brandl filecmp.dircmp does exact match only 01/04/08 http://bugs.python.org/issue1738 created flxkid Testing CIA.vc 01/05/08 CLOSED http://bugs.python.org/issue1739 created loewis use unittest for test_logging 01/06/08 http://bugs.python.org/issue1740 created pitrou patch .pypirc not found on windows 01/06/08 http://bugs.python.org/issue1741 created gerdus os.path.relpath fails when path == start 01/06/08 CLOSED http://bugs.python.org/issue1742 created townerj IDLE fails to launch 01/06/08 http://bugs.python.org/issue1743 created richjtd readline module - set/get quote delimiters 01/06/08 http://bugs.python.org/issue1744 created loic patch Backport of PEP 3102 "keyword-only arguments" to 2.6 01/06/08 http://bugs.python.org/issue1745 created robin.stocker patch ZIP files with archive comments longer than 4k not recognized as 01/06/08 http://bugs.python.org/issue1746 created alanmcintyre issubclass(NotSubclassOfObject, InstanceOfAbcMeta) fails instead 01/06/08 CLOSED http://bugs.python.org/issue1747 created jyasskin patch contextlib.contextmanager does not use functools.wraps 01/06/08 http://bugs.python.org/issue1748 created pitrou Test: This is title 01/06/08 CLOSED http://bugs.python.org/issue1750 created loewis Fast BytesIO implementation + misc changes 01/07/08 http://bugs.python.org/issue1751 created alexandre.vassalotti patch logging.basicConfig misleading behaviour 01/07/08 CLOSED http://bugs.python.org/issue1752 created imax TextIOWrapper.write writes utf BOM for every string 01/07/08 CLOSED http://bugs.python.org/issue1753 created erickt WindowsError messages are not properly encoded 01/07/08 http://bugs.python.org/issue1754 created Romulo A. Ceccon Misspelling in future.c in 2.5.1 source (handl should be handle) 01/07/08 CLOSED http://bugs.python.org/issue1755 created brad -m broken in trunk 01/07/08 CLOSED http://bugs.python.org/issue1756 created gvanrossum Decimal hash depends on current context 01/07/08 CLOSED http://bugs.python.org/issue1757 created marketdickinson Wrong link in documentation 01/07/08 CLOSED http://bugs.python.org/issue1758 created martin.marcher Backport of PEP 3129 "class decorators" 01/08/08 http://bugs.python.org/issue1759 created tiran patch PEP 341 is not reflected in the documentation 01/08/08 http://bugs.python.org/issue1760 created Yinon Bug in re.sub() 01/08/08 CLOSED http://bugs.python.org/issue1761 created jmravon Inheriting from ABC slows Decimal down. 01/08/08 http://bugs.python.org/issue1762 created jyasskin Winpath module - easy access to Windows directories like My Docu 01/08/08 http://bugs.python.org/issue1763 created tiran patch Remove cmp parameter to list.sort() and builtin.sorted() 01/09/08 http://bugs.python.org/issue1771 created gvanrossum popen fails when there are two or more pathnames/parameters with 01/09/08 http://bugs.python.org/issue1772 created shoermann Reference to Python issue tracker incorrect 01/09/08 CLOSED http://bugs.python.org/issue1773 created aioryi Reference to New style classes documentation is incorrect 01/09/08 CLOSED http://bugs.python.org/issue1774 created aioryi filehandle.write() does not return None (Python 3.0a2) 01/09/08 http://bugs.python.org/issue1775 created aroberge __import__ must not accept filenames 01/09/08 CLOSED http://bugs.python.org/issue1776 created tiran ElementTree/cElementTree findtext inconsistency 01/09/08 http://bugs.python.org/issue1777 created gmonroe SyntaxError.offset sometimes wrong 01/09/08 http://bugs.python.org/issue1778 created AchimGaedke int("- 1") is valud, but float("- 1") isn't. Which is right? 01/10/08 http://bugs.python.org/issue1779 created gvanrossum Decimal constructor accepts newline terminated strings 01/10/08 http://bugs.python.org/issue1780 created marketdickinson ConfigParser: add_section('DEFAULT') causes duplicate sections. 01/10/08 http://bugs.python.org/issue1781 created tlesher PyModule_AddIntConstant and PyModule_AddStringConstant can leak 01/10/08 http://bugs.python.org/issue1782 created hniksic nonexistent data items declared as exports in sysmodule.h 01/10/08 http://bugs.python.org/issue1783 created jlaurila Error with OptionParser.parse_args() 01/10/08 CLOSED http://bugs.python.org/issue1784 created draghuram "inspect" gets broken by some descriptors 01/10/08 http://bugs.python.org/issue1785 created dmaurer pdb should set stdin+stdout around exec call 01/11/08 http://bugs.python.org/issue1786 created gvanrossum patch segfault in obmalloc.c 01/11/08 CLOSED http://bugs.python.org/issue1787 created ctheune Outdated link in the tutorial 01/11/08 CLOSED http://bugs.python.org/issue1788 created spe-anatol incorrect assumption about unsigned long byte size 01/11/08 http://bugs.python.org/issue1789 created spe-anatol xmlrpclib ServerProxy page has out-of-date content 01/11/08 http://bugs.python.org/issue1790 created vilya The Library Reference still refers to the old bug tracker. 01/11/08 CLOSED http://bugs.python.org/issue1791 created vilya o(n*n) marshal.dumps performance for largish objects with patch 01/11/08 http://bugs.python.org/issue1792 created aaron_watters patch ctypes.util.find_msvcrt() function 01/11/08 http://bugs.python.org/issue1793 created theller patch Hot keys must work in any keyboard layout 01/11/08 http://bugs.python.org/issue1794 created Nashev logging: need a way to discard Logger objects 01/06/08 http://bugs.python.org/issue932563 reopened georg.brandl Issues Now Closed (349) _______________________ 2to3 crashes on input files with no trailing newlines 136 days http://bugs.python.org/issue1001 admin pyexpat.XMParserType broken (was: pydoc doesn't work on pyexpat) 134 days http://bugs.python.org/issue1020 admin Tkinter binding involving Control-spacebar raises unicode error 133 days http://bugs.python.org/issue1028 admin patch py3k _bsddb.c patch to use the new buffer API 133 days http://bugs.python.org/issue1036 admin patch Ill-coded identifier crashes python when coding spec is utf-8 132 days http://bugs.python.org/issue1037 admin [py3k] pdb does not work in python 3000 132 days http://bugs.python.org/issue1038 admin ssl.py shouldn't change class names from 2.6 to 3.x 129 days http://bugs.python.org/issue1065 admin Implement PEPs 3109, 3134 129 days http://bugs.python.org/issue1066 admin patch test_smtplib failures (caused by asyncore) 128 days http://bugs.python.org/issue1067 admin patch invalid file encoding results in "SyntaxError: None" 129 days http://bugs.python.org/issue1069 admin unicode identifiers in error messages 129 days http://bugs.python.org/issue1070 admin file.seek allows float arguments 127 days http://bugs.python.org/issue1081 admin Warning required when calling register() on an ABCMeta subclass 37 days http://bugs.python.org/issue1109 admin patch _curses issues on 64-bit big-endian (e.g, AIX) 125 days http://bugs.python.org/issue1114 akuchling patch Document inspect.getfullargspec() 122 days http://bugs.python.org/issue1121 admin No tests for inspect.getfullargspec() 122 days http://bugs.python.org/issue1127 admin patch Idle - Save (buffer) - closes IDLE and does not save file (Windo 121 days http://bugs.python.org/issue1130 admin Parsing a simple script eats all of your memory 120 days http://bugs.python.org/issue1134 admin patch pyexpat patch for changing buffer_size 121 days http://bugs.python.org/issue1137 AchimGaedke patch Fixer needed for __future__ imports 119 days http://bugs.python.org/issue1138 admin test_urllib2net fails on test_ftp 116 days http://bugs.python.org/issue1157 admin Should itertools.count work for arbitrary integers? 113 days http://bugs.python.org/issue1165 admin allow subclassing of bytes type 111 days http://bugs.python.org/issue1171 admin patch Paticular decimal mod operation wrongly output NaN. 110 days http://bugs.python.org/issue1182 marketdickinson test fixes for immutable bytes change 108 days http://bugs.python.org/issue1184 admin patch os.system() encoding bug on Windows 105 days http://bugs.python.org/issue1193 admin Restrict Google search to docs when in the docs subtree? 101 days http://bugs.python.org/issue1218 georg.brandl 3.0 library/stdtypes.rst 96 days http://bugs.python.org/issue1229 admin option.dest not set when callback called with optparse 90 days http://bugs.python.org/issue1243 gvanrossum subprocess Popen wait() function hangs when stdout is > 20480 88 days http://bugs.python.org/issue1256 tiran PEP 3137: make bytesobject.c methods 88 days http://bugs.python.org/issue1261 admin patch PEP 3137 patch - str8/str comparison should return false 87 days http://bugs.python.org/issue1263 admin patch pdb bug with "with" statement 87 days http://bugs.python.org/issue1265 admin Py3K cannot run as ``python -S`` 77 days http://bugs.python.org/issue1267 admin patch PyBytes (buffer) .extend method needs to accept any iterable of 83 days http://bugs.python.org/issue1283 admin patch Fixes for profile/cprofile 79 days http://bugs.python.org/issue1302 admin patch adapt str8 constructor to bytes constructor 79 days http://bugs.python.org/issue1303 admin patch fix a few PyInt_Check vs PyLong_Check problems 75 days http://bugs.python.org/issue1316 admin patch zipimport.zipimporter.archive undocumented and untested 73 days http://bugs.python.org/issue1325 georg.brandl Fix truncate on Windows, this time for real 73 days http://bugs.python.org/issue1330 admin patch More fixes for Windows 73 days http://bugs.python.org/issue1331 admin patch Fix for test_netrc on Windows 71 days http://bugs.python.org/issue1345 admin patch BaseHTTPServer writing strings to bytes interface 71 days http://bugs.python.org/issue1347 admin patch more uses of ord() in plat-mac/ic.py 71 days http://bugs.python.org/issue1349 admin patch Add getsize() to io instances 70 days http://bugs.python.org/issue1351 admin patch Two bsddb tests temporarily commented out in py3k branch 66 days http://bugs.python.org/issue1371 admin turn off socket timeout in test_xmlrpc 65 days http://bugs.python.org/issue1373 admin patch test_import breaks on Linux 59 days http://bugs.python.org/issue1377 admin reloading imported modules sometimes fail with 'parent not in sy 64 days http://bugs.python.org/issue1379 admin patch fix for test_asynchat and test_asyncore on pep3137 branch 64 days http://bugs.python.org/issue1380 admin patch py3k-pep3137: patch for test_ctypes 63 days http://bugs.python.org/issue1382 admin patch Windows fix for inspect tests 63 days http://bugs.python.org/issue1384 admin patch hmac module violates RFC for some hash functions, e.g. sha512 63 days http://bugs.python.org/issue1385 admin py3k-pep3137: patch to ensure that all codecs return bytes 63 days http://bugs.python.org/issue1386 admin patch py3k-pep3137: patch for hashlib on Windows 63 days http://bugs.python.org/issue1387 admin patch py3k-pep3137: possible ref leak in ctypes 63 days http://bugs.python.org/issue1388 admin py3k-pep3137: struct module is leaking references 63 days http://bugs.python.org/issue1389 admin py3k-pep3137: issue warnings / errors on str(bytes()) and simila 62 days http://bugs.python.org/issue1392 admin patch function comparing lacks NotImplemented error 61 days http://bugs.python.org/issue1393 gvanrossum py3k: duplicated line endings when using read(1) 62 days http://bugs.python.org/issue1395 admin py3k-pep3137: patch for mailbox 61 days http://bugs.python.org/issue1396 admin patch Py3k's print() flushing problem 60 days http://bugs.python.org/issue1400 admin py_compile and compileall need unit tests 59 days http://bugs.python.org/issue1403 admin Use widechar api for os.environ 59 days http://bugs.python.org/issue1406 admin patch new keyword-only function parameters interact badly with nested 59 days http://bugs.python.org/issue1409 admin Fix for refleak tests 58 days http://bugs.python.org/issue1414 admin patch py3k: pythonw.exe fails because std streams a missing 58 days http://bugs.python.org/issue1415 admin Unicode literals in tokenize.py and tests. 56 days http://bugs.python.org/issue1420 admin patch Writing to an invalid fd doesn't raise an exception 56 days http://bugs.python.org/issue1422 admin py3k: readline and rlcompleter doesn't list choices 56 days http://bugs.python.org/issue1424 admin readline: no display matches hook set 56 days http://bugs.python.org/issue1425 admin readline module needs a review 56 days http://bugs.python.org/issue1426 admin Calling base class methods is slow due to __instancecheck__ over 54 days http://bugs.python.org/issue1438 admin proposed 3000 patch for socket.py - "socket GC worries" 54 days http://bugs.python.org/issue1439 admin patch Checks for PySys_GetObject("std???") == Py_None 54 days http://bugs.python.org/issue1440 admin patch SSL patch for Python 3000 52 days http://bugs.python.org/issue1451 admin patch VS2008, quick hack for distutils.msvccompiler 50 days http://bugs.python.org/issue1455 admin patch inet_pton redefined while building with windows SDK 6.0 48 days http://bugs.python.org/issue1464 admin patch SSL tests leak memory 48 days http://bugs.python.org/issue1469 admin py3k unit tests are removing %TEMP% dir on Windows 48 days http://bugs.python.org/issue1470 admin Drop _EXPORTS macros in PCbuild9 48 days http://bugs.python.org/issue1473 admin pythoncore.vcproj fails to generate buildinfo (when spaces in pa 47 days http://bugs.python.org/issue1478 admin patch csv module is leaking references 47 days http://bugs.python.org/issue1479 admin sqlite module is leaking lots of references 47 days http://bugs.python.org/issue1480 admin PCBuild9 _ssl.vcproj improperly launches build 45 days http://bugs.python.org/issue1488 admin patch Patch to remove unbound methods 44 days http://bugs.python.org/issue1493 admin patch add str.maketrans() 43 days http://bugs.python.org/issue1496 admin patch Patch to remove API to create new unbound methods 42 days http://bugs.python.org/issue1497 admin patch Rename __builtins__ to __root_namespace__? 41 days http://bugs.python.org/issue1498 admin failure behaviour of compile() is missing 41 days http://bugs.python.org/issue1499 georg.brandl 0 ** 0 documentation 41 days http://bugs.python.org/issue1501 georg.brandl Changes to PyMethod_New breaks ctypes on Windows 40 days http://bugs.python.org/issue1505 admin Removal of stale code in _csv.c / pyexpat.c 40 days http://bugs.python.org/issue1508 admin Problem with static libs on Windows 37 days http://bugs.python.org/issue1527 admin patch sys.maxfloat patch 37 days http://bugs.python.org/issue1534 admin patch Rename __builtin__ to builtins 36 days http://bugs.python.org/issue1535 admin patch test_collections: failing refleak test 35 days http://bugs.python.org/issue1539 admin Port Python/import.c to py3k branch 34 days http://bugs.python.org/issue1551 admin import distutils.msvccompiler hangs when the environment is too 32 days http://bugs.python.org/issue1557 admin x64 platform doesn't define _WIN64 32 days http://bugs.python.org/issue1558 admin 64bit Decimal can't be subclassed useful 32 days http://bugs.python.org/issue1562 facundobatista The set implementation should special-case PyUnicode instead of 31 days http://bugs.python.org/issue1564 admin Better description of 'L' repr removal in "What's New" 29 days http://bugs.python.org/issue1571 admin 404 report of SimpleXMLRPCServer is broken 29 days http://bugs.python.org/issue1572 admin Improper use of the keyword-only syntax makes the parser crash 29 days http://bugs.python.org/issue1573 admin Problems in win_getpass 28 days http://bugs.python.org/issue1578 admin Documentation patch for reversed() and __reversed__() 27 days http://bugs.python.org/issue1582 georg.brandl IDLE uses non-existent xrange() function (Py30a2) 27 days http://bugs.python.org/issue1585 admin IDLE no longer shows colour syntax highlighting in the Shell (Py 26 days http://bugs.python.org/issue1586 admin instancemethod wrapper for PyCFunctions 26 days http://bugs.python.org/issue1587 admin patch popen2.Popen3 class (Unix) documentation misleading / confusing 26 days http://bugs.python.org/issue1591 georg.brandl spacing of the builtin_format function is inconsistent 26 days http://bugs.python.org/issue1593 admin patch IDLE not working correctly on Windows (Py30a2/IDLE30a1) 26 days http://bugs.python.org/issue1601 admin Patch for TCL 8.5 support 25 days http://bugs.python.org/issue1607 admin patch test_str.py crashes 27 days http://bugs.python.org/issue1608 gvanrossum Makefile's VPATH feature is broken 24 days http://bugs.python.org/issue1613 admin New @spam.getter property syntax modifies the property in place 24 days http://bugs.python.org/issue1620 admin patch test_distutils unit test is failing rev:59499 23 days http://bugs.python.org/issue1628 admin sys.maxint is documented but should not be 23 days http://bugs.python.org/issue1630 admin Float patch for inf and nan on Windows (and other platforms) 23 days http://bugs.python.org/issue1635 admin patch urlparse.urlparse misparses URLs with query but no path 20 days http://bugs.python.org/issue1637 gvanrossum Make socket support TIPC. 21 days http://bugs.python.org/issue1646 tiran patch Make math.{floor,ceil}(float) return ints per PEP 3141 19 days http://bugs.python.org/issue1656 admin patch -E command line parameter intent 18 days http://bugs.python.org/issue1668 georg.brandl patch "World" tool ported to py3k 17 days http://bugs.python.org/issue1671 admin patch what is decimal.Context.get_manager()? 16 days http://bugs.python.org/issue1680 georg.brandl parameter name for optparse parse_args incorrect 16 days http://bugs.python.org/issue1681 georg.brandl Syntax Error exception dosen't print string; not informative 14 days http://bugs.python.org/issue1692 admin patch Please check merge from trunk 14 days http://bugs.python.org/issue1693 admin urlparse and usernames containing @ 14 days http://bugs.python.org/issue1698 orsenthil patch Word "alias" used in confusing way to compare open() and file() 10 days http://bugs.python.org/issue1702 georg.brandl Small errors in new-style classes doc 6 days http://bugs.python.org/issue1712 georg.brandl Cosmetic patch for doc/code mismatch (msilib.UuidCreate) 4 days http://bugs.python.org/issue1719 georg.brandl _tkinter.c:903: AsObj: Assertion `size < size * sizeof(Tcl_UniCh 4 days http://bugs.python.org/issue1721 admin -1e-1000 converted incorrectly 2 days http://bugs.python.org/issue1725 gvanrossum patch Remove Python/atof.c from PCBuild/pythoncore.vcproj 3 days http://bugs.python.org/issue1726 admin patch VC6 build patch for python3000 3 days http://bugs.python.org/issue1727 admin patch Documentation corrections for os module 2 days http://bugs.python.org/issue1730 georg.brandl patch Random errors on interpreter shutdown 6 days http://bugs.python.org/issue1731 gvanrossum documentation on metaclasses is incomplete and misleading 2 days http://bugs.python.org/issue1734 georg.brandl Windows installer issue (ObjectBrowser.py) 4 days http://bugs.python.org/issue1737 loewis Testing CIA.vc 0 days http://bugs.python.org/issue1739 loewis os.path.relpath fails when path == start 0 days http://bugs.python.org/issue1742 georg.brandl issubclass(NotSubclassOfObject, InstanceOfAbcMeta) fails instead 0 days http://bugs.python.org/issue1747 jyasskin patch Test: This is title 3 days http://bugs.python.org/issue1750 georg.brandl logging.basicConfig misleading behaviour 0 days http://bugs.python.org/issue1752 vsajip TextIOWrapper.write writes utf BOM for every string 0 days http://bugs.python.org/issue1753 alexandre.vassalotti Misspelling in future.c in 2.5.1 source (handl should be handle) 0 days http://bugs.python.org/issue1755 georg.brandl -m broken in trunk 0 days http://bugs.python.org/issue1756 gvanrossum Decimal hash depends on current context 1 days http://bugs.python.org/issue1757 facundobatista Wrong link in documentation 0 days http://bugs.python.org/issue1758 loewis Bug in re.sub() 3 days http://bugs.python.org/issue1761 amaury.forgeotdarc Reference to Python issue tracker incorrect 0 days http://bugs.python.org/issue1773 akuchling Reference to New style classes documentation is incorrect 0 days http://bugs.python.org/issue1774 facundobatista __import__ must not accept filenames 0 days http://bugs.python.org/issue1776 tiran Error with OptionParser.parse_args() 0 days http://bugs.python.org/issue1784 gvanrossum segfault in obmalloc.c 0 days http://bugs.python.org/issue1787 gvanrossum Outdated link in the tutorial 0 days http://bugs.python.org/issue1788 facundobatista The Library Reference still refers to the old bug tracker. 0 days http://bugs.python.org/issue1791 facundobatista How to install some stuff to /usr/sbin 2331 days http://bugs.python.org/issue452144 tiran Tcl event loop callback woes 2330 days http://bugs.python.org/issue452973 tiran Improve the ZipFile Interface 2286 days http://bugs.python.org/issue467924 georg.brandl python directory not added to PATH 2240 days http://bugs.python.org/issue482531 tiran Portable compiler option specification 2219 days http://bugs.python.org/issue490264 tiran Print line number of string if at EOF 2011 days http://bugs.python.org/issue577295 tiran option for not writing .py[co] files 1956 days http://bugs.python.org/issue602345 georg.brandl patch need easy way of decoding a literal 1920 days http://bugs.python.org/issue617979 tiran Windows binary missing IPv6 support 1918 days http://bugs.python.org/issue618593 tiran refcount problem involving debugger 1764 days http://bugs.python.org/issue699594 tiran Easy tutorial printing should be possible 1739 days http://bugs.python.org/issue714469 georg.brandl event handling support 1674 days http://bugs.python.org/issue750423 tiran Thread in threading.py can only be started once 1671 days http://bugs.python.org/issue751260 tiran inspect.getmembers broken (?) 1658 days http://bugs.python.org/issue759525 georg.brandl Zero Configuration Networking? 1559 days http://bugs.python.org/issue813922 tiran Digital Unix build fails to create ccpython.o 1512 days http://bugs.python.org/issue842171 tiran Check for signals during regular expression matches 1510 days http://bugs.python.org/issue846388 facundobatista patch PyErrr_Display and traceback.format_exception_only behaviour 1483 days http://bugs.python.org/issue860326 admin patch distutils doesn't see user-directories set via VisStudio 7.1 1442 days http://bugs.python.org/issue883969 tiran Python configured with --disable-unicode fails tests, more 1389 days http://bugs.python.org/issue919614 georg.brandl There ought to be a way to uninstall 1314 days http://bugs.python.org/issue963845 tiran Ctrl-C causes odd behaviour 1312 days http://bugs.python.org/issue964949 tiran getattr(object,name) accepts only strings 1280 days http://bugs.python.org/issue985094 tiran os constants missing 1269 days http://bugs.python.org/issue990749 tiran PyErr_Clear() vs. AsynchronousException 1236 days http://bugs.python.org/issue1009929 tiran patch Seting defaultencoding through an environment variable 1170 days http://bugs.python.org/issue1052098 tiran Memory leak in socket.py on Mac OS X 10.3 1103 days http://bugs.python.org/issue1092502 tiran subprocess fails on GetStdHandle in interactive GUI 1055 days http://bugs.python.org/issue1124861 dserodio No os.statvfs on FreeBSD 1048 days http://bugs.python.org/issue1145231 tiran No os.spawn*p* on Windows 1023 days http://bugs.python.org/issue1166378 tiran Time module is missing inverse of gmtime() 894 days http://bugs.python.org/issue1245224 georg.brandl patch cross compile and mingw support 800 days http://bugs.python.org/issue1339673 tiran patch PythonD new file: python2.4/plat-ms-dos5/djstat.py 788 days http://bugs.python.org/issue1351036 tiran patch socket.recv(OOB) raises exception on closed socket 757 days http://bugs.python.org/issue1379209 facundobatista re search infinite loop 668 days http://bugs.python.org/issue1448325 tiran Add .format() method to str and unicode 644 days http://bugs.python.org/issue1463370 admin patch Make -tt the default 634 days http://bugs.python.org/issue1469190 admin patch Fix test_augassign in p3yk 632 days http://bugs.python.org/issue1470424 admin patch fix test_exceptions in p3yk 632 days http://bugs.python.org/issue1470459 admin patch fix test_bisect in p3yk 632 days http://bugs.python.org/issue1470460 admin patch Mention coercion removal in Misc/NEWS 632 days http://bugs.python.org/issue1470502 admin partially fix test_class in p3yk 632 days http://bugs.python.org/issue1470504 admin patch fix test_descrtut in p3yk 632 days http://bugs.python.org/issue1470515 admin patch fix test_enumerate in p3yk 632 days http://bugs.python.org/issue1470522 admin patch Fix test_descr in p3yk 632 days http://bugs.python.org/issue1470536 admin patch fix test_getargs2 in p3yk 632 days http://bugs.python.org/issue1470543 admin patch fix test_inspect in p3yk 632 days http://bugs.python.org/issue1470560 admin patch fix test_itertools in p3yk 632 days http://bugs.python.org/issue1470566 admin patch Forbid iteration over strings 630 days http://bugs.python.org/issue1471291 admin patch make range be xrange 628 days http://bugs.python.org/issue1472639 admin patch Remove types.InstanceType and new.instance 590 days http://bugs.python.org/issue1495675 admin patch Fix test_exceptions.py 589 days http://bugs.python.org/issue1496135 admin patch deprecate METH_OLDARGS 587 days http://bugs.python.org/issue1496957 admin patch Change *args from a tuple to list 585 days http://bugs.python.org/issue1498441 admin patch (py3k) Remove the sets module 581 days http://bugs.python.org/issue1500611 admin patch Remove the repr()-backticks 581 days http://bugs.python.org/issue1500623 admin patch There should be a Python build using Visual Studio 2005 572 days http://bugs.python.org/issue1504947 tiran Add some dicts to datetime module 570 days http://bugs.python.org/issue1506296 tiran Remove reduce() 559 days http://bugs.python.org/issue1513249 admin patch Move reduce() to functools 558 days http://bugs.python.org/issue1513870 admin patch Under OS X, compiling against local readline fails 552 days http://bugs.python.org/issue1516068 tiran Remove sys.exitfunc 552 days http://bugs.python.org/issue1516375 admin patch Add some explication to PEP 3100 542 days http://bugs.python.org/issue1522038 admin patch Remove operator.truth() and operator.abs() 542 days http://bugs.python.org/issue1522059 admin patch tarfile chokes on ipython archive on Windows 532 days http://bugs.python.org/issue1527974 lars.gustaebel tarfile __slots__ addition 511 days http://bugs.python.org/issue1540385 lars.gustaebel patch xrange that supports longs, etc 500 days http://bugs.python.org/issue1546078 admin patch Create a real zip iterator object; not using itertools.izip 500 days http://bugs.python.org/issue1546297 admin patch set literals 497 days http://bugs.python.org/issue1547796 admin patch "if x in setliteral" peepholer optimization 496 days http://bugs.python.org/issue1548082 admin patch set comprehensions 496 days http://bugs.python.org/issue1548388 admin patch Implementation of PEP 3102 Keyword Only Argument 494 days http://bugs.python.org/issue1549670 admin patch Ellipsis literal "..." 492 days http://bugs.python.org/issue1550786 admin patch make exec a function 492 days http://bugs.python.org/issue1550800 admin patch shutil.copyfile incomplete on NTFS 477 days http://bugs.python.org/issue1559684 georg.brandl copy() method of dictionaries is not "deep" 481 days http://bugs.python.org/issue1560327 akuchling RE (regular expression) matching stuck in loop 470 days http://bugs.python.org/issue1566086 georg.brandl help(x) for keywords too 456 days http://bugs.python.org/issue1572210 georg.brandl modulefinder changes for py3k 436 days http://bugs.python.org/issue1585966 admin patch __bool__ instead of __nonzero__ 411 days http://bugs.python.org/issue1600346 admin patch sys.intern() 409 days http://bugs.python.org/issue1601678 admin patch Optional Argument Syntax 400 days http://bugs.python.org/issue1607548 admin patch tempfile.TemporaryFile differences between linux and windows 389 days http://bugs.python.org/issue1615275 georg.brandl extended slicing for bytes objects 385 days http://bugs.python.org/issue1617678 admin patch sys.intern() 2to3 fixer 383 days http://bugs.python.org/issue1619049 admin patch Bug fixes for int unification branch 382 days http://bugs.python.org/issue1619846 admin patch update to PEP 344 - exception attributes 369 days http://bugs.python.org/issue1626538 admin patch backticks will not be used at all 368 days http://bugs.python.org/issue1627052 admin patch Win32: Fix build when you have TortoiseSVN but no .svn/* 367 days http://bugs.python.org/issue1628061 admin patch Win32: Add bytesobject.c to pythoncore.vcproj 367 days http://bugs.python.org/issue1628062 admin patch clarify 80-char limit 366 days http://bugs.python.org/issue1628906 admin The Unicode "lazy strings" patches 366 days http://bugs.python.org/issue1629305 admin patch Implement named exception cleanup 364 days http://bugs.python.org/issue1630248 admin patch New exception syntax 362 days http://bugs.python.org/issue1631942 admin patch Py3k: Fix pybench so it runs 359 days http://bugs.python.org/issue1634499 admin patch PyFloat_FromString deprecated form 338 days http://bugs.python.org/issue1650903 admin Hide iteration variable in list comprehensions 325 days http://bugs.python.org/issue1660500 admin patch inspect.getargspec() fails with keyword-only arguments 315 days http://bugs.python.org/issue1668565 admin methods for bytes 314 days http://bugs.python.org/issue1669633 admin patch Remove Py_PROTO from socket in py3k 313 days http://bugs.python.org/issue1670209 admin patch Class Decorators 312 days http://bugs.python.org/issue1671208 admin patch New File I/O type for Python 3000, plus .h and unit tests 312 days http://bugs.python.org/issue1671314 admin patch PEP 3114 -- next() -> __next__() 306 days http://bugs.python.org/issue1675363 admin patch Removal of Tuple Parameter Unpacking [PEP3113] 302 days http://bugs.python.org/issue1678060 admin patch Lib/io.py open uses unset "bs" 300 days http://bugs.python.org/issue1679498 admin remove sys.exitfunc, rewrite atexit in C 298 days http://bugs.python.org/issue1680961 admin patch PEP 3115 patch 298 days http://bugs.python.org/issue1681101 admin patch subprocess.Popen fails with socket._fileobject on Windows 297 days http://bugs.python.org/issue1681674 tiran xreload.py won't update class docstrings 294 days http://bugs.python.org/issue1683288 admin modindex.html builds incorrectly in Python 3 292 days http://bugs.python.org/issue1684811 admin Add IllegalStateError 291 days http://bugs.python.org/issue1685642 admin patch More PEP 3116 classes 290 days http://bugs.python.org/issue1686273 admin patch csv sniff example 290 days http://bugs.python.org/issue1686390 georg.brandl Inconsistent Exceptions for Readonly Attributes 289 days http://bugs.python.org/issue1687163 admin Remove redundant code in ntpath.walk() 273 days http://bugs.python.org/issue1696393 georg.brandl patch Property with -> annotation triggers assert 272 days http://bugs.python.org/issue1697248 admin types.InstanceType is missing but used by pydoc 271 days http://bugs.python.org/issue1697782 admin getstate/setstate for incremental codecs 270 days http://bugs.python.org/issue1698994 admin patch 'nonlocal x' at top level crashes interpreter 259 days http://bugs.python.org/issue1705365 admin Implementation of @abstractmethod for PEP 3119 257 days http://bugs.python.org/issue1706989 admin patch Make isinstance/issubclass overloadable for PEP 3119 255 days http://bugs.python.org/issue1708353 admin patch PEP 3132: extended unpacking 249 days http://bugs.python.org/issue1711529 admin patch Patch for PEP 3109 245 days http://bugs.python.org/issue1713889 admin patch PEP 3123 implementation 238 days http://bugs.python.org/issue1718153 admin patch Remove backslash escapes from tokenize.c. 235 days http://bugs.python.org/issue1720390 admin patch automatic imports 237 days http://bugs.python.org/issue1720992 juanmabc3 dict size changes during iter 227 days http://bugs.python.org/issue1724999 admin patch subprocess: unreliability of returncode not clear from docs 223 days http://bugs.python.org/issue1727024 georg.brandl First steps towards new super (PEP 3135) 223 days http://bugs.python.org/issue1727209 admin patch os._execvpe raises assignment error in python 3000 svn 217 days http://bugs.python.org/issue1730441 admin Kill StandardError 209 days http://bugs.python.org/issue1735485 admin patch Interactive help raise exception while listing modules 201 days http://bugs.python.org/issue1739659 admin struni: fix for test_cmd_line 180 days http://bugs.python.org/issue1751493 admin patch struni: Replace assert_(==) with failUnlessEqual 180 days http://bugs.python.org/issue1751515 admin patch struni: str() doesn't call __str__() of subclasses of str 180 days http://bugs.python.org/issue1751598 admin Dict comprehensions 179 days http://bugs.python.org/issue1751800 admin patch Patch for Windows build 179 days http://bugs.python.org/issue1751801 admin patch struni: Three ctypes tests are SEGFAULTing 179 days http://bugs.python.org/issue1751885 admin struni: help() is broken 179 days http://bugs.python.org/issue1751932 admin struni: gettext fixes 179 days http://bugs.python.org/issue1751958 admin patch Typo in Lib/lib-tk/ScrolledText.py 179 days http://bugs.python.org/issue1751965 admin patch Use the bytes type in asynchat 179 days http://bugs.python.org/issue1752173 admin patch PyHeapTypeObject fix 179 days http://bugs.python.org/issue1752184 admin patch struni: for for poll, pep263, bigmem and a bit pickletool 179 days http://bugs.python.org/issue1752195 admin patch struni: _fileio fixes for Windows 179 days http://bugs.python.org/issue1752225 admin patch Use the Unicode API in dlmodule.c 179 days http://bugs.python.org/issue1752229 admin patch reference leak in _PyUnicode_AsDefaultEncodedString 179 days http://bugs.python.org/issue1752317 admin patch fix failing unit tests in mmap in struni branch 178 days http://bugs.python.org/issue1752647 admin patch Lib/regrtest.py -x 'test_xxx' does not work 178 days http://bugs.python.org/issue1753310 admin patch struni: assertion in Windows debug build 177 days http://bugs.python.org/issue1753395 admin test_urllib2.test_fie passes 177 days http://bugs.python.org/issue1753889 admin patch struni: Bytes support for TextIOWrapper.write() 175 days http://bugs.python.org/issue1754339 admin patch struni: Various patches for windows 175 days http://bugs.python.org/issue1754484 admin patch document default values for sort parameters 174 days http://bugs.python.org/issue1755097 georg.brandl urllib2 tests pass 174 days http://bugs.python.org/issue1755133 admin patch struni: corrections for test_cProfile 174 days http://bugs.python.org/issue1755176 admin patch Deadlocks with fork() and multithreading 175 days http://bugs.python.org/issue1755179 facundobatista struni: corrections in ftplib 174 days http://bugs.python.org/issue1755206 admin patch struni: correction for sockets on win32 174 days http://bugs.python.org/issue1755214 admin patch struni: correction for _winreg module 174 days http://bugs.python.org/issue1755229 admin patch Add support for seeking/writing beyond EOF to io.BytesIO 170 days http://bugs.python.org/issue1757683 admin patch struni: make test_ucn pass 170 days http://bugs.python.org/issue1757758 admin patch struni: fix str/bytes errors for test_oldmailbox 170 days http://bugs.python.org/issue1757774 admin patch struni: make test_mailbox and test_old_mailbox pass 170 days http://bugs.python.org/issue1757839 admin patch struni: Fix test_macostools 168 days http://bugs.python.org/issue1758570 admin patch pyexpat unit tests - str/uni branch 167 days http://bugs.python.org/issue1759016 admin patch struni pulldom: Don't use 'types' to check strings 166 days http://bugs.python.org/issue1759922 admin patch struni: Fix test_aepack by converting 4cc's to bytes 164 days http://bugs.python.org/issue1761465 admin patch struni: test_xml_etree.py 163 days http://bugs.python.org/issue1762412 admin patch struni: test_urllib2, test_cookielib 162 days http://bugs.python.org/issue1762940 admin patch Fix for test_socketserver for Py3k 159 days http://bugs.python.org/issue1764815 admin patch Fix for test_zipimport 157 days http://bugs.python.org/issue1766592 admin patch test_csv struni fixes + unicode support in _csv 156 days http://bugs.python.org/issue1767398 admin patch test_asyncore fix 155 days http://bugs.python.org/issue1767834 admin patch Fix for failing test_scriptpackages in py3k-struni 153 days http://bugs.python.org/issue1768976 admin patch Fix for failing test_plistlib in py3k-struni 153 days http://bugs.python.org/issue1769016 admin patch struni: test_xml_etree_c 152 days http://bugs.python.org/issue1769767 admin patch Remove cStringIO usage 151 days http://bugs.python.org/issue1770008 admin patch ctypes: c_char now uses bytes and not str (unicode) 151 days http://bugs.python.org/issue1770355 admin patch Errors in site.py not reported properly 150 days http://bugs.python.org/issue1771260 admin Misc improvements for the io module 150 days http://bugs.python.org/issue1771364 admin patch dir() on traceback objects returns an empty list 148 days http://bugs.python.org/issue1772489 admin exec() doesn't take an open file 147 days http://bugs.python.org/issue1772686 admin Unify __builtins__ -> __builtin__ 145 days http://bugs.python.org/issue1774369 admin patch Make it possible to use SVK to develop Python 145 days http://bugs.python.org/issue1774414 admin patch Binding <Control-space> fails 144 days http://bugs.python.org/issue1774736 admin Override flags set by IOBase in io.StringIO 144 days http://bugs.python.org/issue1774828 admin patch Convert str to bytes in io.BytesIO.__init__ 144 days http://bugs.python.org/issue1774833 admin patch utf-32 codecs 143 days http://bugs.python.org/issue1775604 admin patch memoryview('test') is causing a segfault 141 days http://bugs.python.org/issue1777057 admin Top Issues Most Discussed (10) ______________________________ 19 Move Demo/classes/Rat.py to Lib/rational.py and fix it up. 21 days open http://bugs.python.org/issue1682 13 Decimal constructor accepts newline terminated strings 2 days open http://bugs.python.org/issue1780 13 Bug in re.sub() 3 days closed http://bugs.python.org/issue1761 12 logging: need a way to discard Logger objects 5 days open http://bugs.python.org/issue932563 11 IDLE fails to launch 5 days open http://bugs.python.org/issue1743 10 option for not writing .py[co] files 1956 days closed http://bugs.python.org/issue602345 10 WindowsError messages are not properly encoded 4 days open http://bugs.python.org/issue1754 9 Winpath module - easy access to Windows directories like My Doc 3 days open http://bugs.python.org/issue1763 9 Do not assume signed integer overflow behavior 29 days open http://bugs.python.org/issue1621 9 Paticular decimal mod operation wrongly output NaN. 110 days closed http://bugs.python.org/issue1182

1 0

Passing contextual information when logging
by Vinay Sajip＠RedDove Jan. 11, 2008

Jan. 11, 2008

I recently posted the following to c.l.py, and didn't get much feedback. I'm planning to add a new class to the logging package, and before I do so I'd like to get feedback from python-dev. I know many of the devs may not be monitoring c.l.py, so I'm reposting here for your feedback. Some users of the logging package have raised an issue regarding the difficulty of passing additional contextual information when logging. For example, the developer of a networked application may want to log, in addition to specifics related to to the network service being provided, information about the IP address of the remote machine and the username of the person logged into and using the service. Python 2.4 introduced an 'extra' keyword argument which was intended to hold a dict-like object containing additional information to be added to a LogRecord. The additional information would then be printed via placeholders in a format string. While this works, it is a little unwieldy to use in practice, because users need to provide the 'extra' parameter in every logging call. This has led people in some instances to create context-specific Logger instances (e.g. one logger for every connection). This has a drawback in that a logger name can only provide limited contextual information, and moreover, if the number of connections is effectively unbounded over time, the number of Logger instances will also grow in an unbounded way. (Logger instances are never garbage collected, because references to them are always held in the logging package. This alleviates a burden on users in that they never have to pass loggers around, but means that creating a lot of Logger instances will lead to a long-lived memory burden.) One solution is to create a generic wrapper around loggers to which a logger name and contextual information can be passed. The wrapper would delegate logging calls to the logger with the specified name, but would manipulate the arguments passed to the logging call to insert the contextual information. I have created such a wrapper class, called LoggerAdapter, which is in the example script located at http://dpaste.com/30613/ I would welcome your views on whether the LoggerAdapter class is suitable for adding to the logging package in Python 2.6/3.0. Does it do what might reasonably be expected out of the box? LoggerAdapters are, of course, garbage collected in the normal way and so impose no particular memory burden. I'll wait a few days for any comments/suggestions from this list, then (assuming no adverse comments) go ahead and add the LoggerAdapter class and update the docs. Best regards, Vinay Sajip

3 3

Coverity Scan, Python upgraded to rung 2
by Christian Heimes Jan. 11, 2008

Jan. 11, 2008

I read the announcement of the Python Users list and figured out that some of the other core developers might be interested in the news, too. Among other projects Python was upgraded to Rung 2 on the Coverity Scan list: http://scan.coverity.com/ Christian

7 16

pkgutil, pkg_resource and Python 3.0 name space packages
by Christian Heimes Jan. 11, 2008

Jan. 11, 2008

Hello! We are discussing name space packages on the stdlib reorg list. For Python 3.0 we plan to organize the packages by purpose, e.g. put all database related packages like sqlite and shelve in a 'databases' name space. Of course we want to have the name spaces extensible by 3rd party software. The Python world as currently two ways to create extensible name space packages: pkgutil and pkg_resource. pkgutil is part of Python 2.5. pkg_resource is scheduled for Python 2.6 and 3.0 in PEP 365 [1]. The PEP hasn't been accepted yet. Questions: * PJE: Is pkg_resource ready for Python 2.6 and 3.0? * GvR: Are you going to accept Phillip's PEP? * PJE: Does pkg_resource have an easy way to overwrite a package in a name space package? E.g. an user wants to overwrite Python's databases.sqlite with a newer version of sqlite. Can he simply do it by inserting a package into sys.path before Lib/ ? Christian [1] http://www.python.org/dev/peps/pep-0365/

15 41

distutils.cygwinccompiler: invalid executable for interpreters
by Alexey Borzenkov Jan. 10, 2008

Jan. 10, 2008

Hi everyone, Some time ago I've stumbled upon a problem with compiling py2exe with mingw: it resulted in invalid executable run.exe. At first I dismissed it as some very strange problem, but recently I decided to look into it again and found that the reason for this is a .def file, supplied during compilation, that causes linker to produce executable with IMAGE_FILE_DLL in its PE Header Characteristics field, and operating system refuses to execute it. I traced this problem to the following block in distutils/cygwinccompiler.py: # handle export symbols by creating a def-file # with executables this only works with gcc/ld as linker if ((export_symbols is not None) and (target_desc != self.EXECUTABLE or self.linker_dll == "gcc")): Removing 'or self.linker_dll == "gcc"' obviously helps. To me this sounds like a bug (introduced in revision 17747 on trunk, more that 7 years old!), but I was wondering if there's any logic behind generating a .def file for the executable (sidenote: look at distutils/emxccompiler.py where .def file is generated for executables only). To me it's very unlikely that anyone *ever* needs to export symbols from an executable (I'm not even sure if it can work as intended on Windows). Even then, if there's anyone at all who needs such a machinery (again, what for?), at the very least it shouldn't produce "LIBRARY" line. As minimal change as this: # Generate .def file contents = [ "LIBRARY %s" % os.path.basename(output_filename), "EXPORTS"] if target_desc == self.EXECUTABLE: contents.pop(0) Did the trick (generated executable runs fine). Is anyone interested in a bug report for this? Also, is there any chance that if there is interest it could end up in release25-maint? Best regards, Alexey.

1 0

Re: [Python-Dev] pkgutil, pkg_resource and Python 3.0 name space packages
by Phillip J. Eby Jan. 10, 2008

Jan. 10, 2008

At 10:47 AM 1/10/2008 +0000, Paul Moore wrote: >On 09/01/2008, Steve Holden <steve(a)holdenweb.com> wrote: > > The idea that users would /program their own computers/ was totally > > alien to the Windows mindset. > >Actually, the alien idea is that more than one person would use the >same (Windows) computer. Not surprising as these were *personal* >computers. It's Windows as a server OS that's the bizarre idea... multiuser != server I've been in a couple of organizations where PCs were shared and thus had different users logging into them. Cash registers and call centers, for example.

1 0

some bugs that need attention
by Ralf Schmitt Jan. 10, 2008

Jan. 10, 2008

Hi, I've taken a look at some bugs in the bugtracker. I think these should be closed: http://bugs.python.org/issue1720992 is about automatic imports. http://bugs.python.org/issue1448325 and http://bugs.python.org/issue1566086 is about the regular expression engine "hanging". These are duplicates of http://bugs.python.org/issue1662581 and should be closed. Regards, - Ralf

2 1

PEP: Lazy module imports and post import hook
by Christian Heimes Jan. 9, 2008

Jan. 9, 2008

I've attached the first public draft of my first PEP. A working patch against the py3k branch is available at http://bugs.python.org/issue1576 Christian PEP: 369 Title: Lazy importing and post import hooks Version: $Revision$ Last-Modified: $Date$ Author: Christian Heimes <christian(at)cheimes(dot)de> Status: Draft Type: Standards Track Content-Type: text/x-rst Created: 02-Jan-2008 Python-Version: 2.6, 3.0 Post-History: Abstract ======== This PEP proposes enhancements for the import machinery to add lazy importing and post import hooks to Python. It is intended primarily to support the wider use of abstract base classes that is expected in Python 3.0. Rationale ========= In current Python an import always loads a module from the disk even if the importing module never actually uses the module named in the import statement. It requires some extra code to conditionally import modules or the unnecessary imports can slow down a small script. Embedding import statements inside functions is no solution, as doing so invokes the import machinery every time the function is called. Hiding the import inside a function also makes the modules dependencies less clear. Python also has no API to hook into the import machinery and execute code *after* a module is successfully loaded. The import hooks of PEP 302 are about finding modules and loading modules but they were not designed to as post import hooks. - An import always loads the module from the disk which may cause a considerable speed impact on the execution time of a small script. - Conditional imports make the code harder to read and may lead to slow and ugly function level imports. - Python can't notify code when a module is loaded. Use cases ========= A use case for a post import hook is mentioned in Nick Coghlan's initial posting [1]_. about callbacks on module import. It was found during the development of Python 3.0 and its ABCs. We wanted to register classes like decimal.Decimal with an ABC but the module should not be imported on every interpreter startup. Nick came up with this example:: @imp.when_imported('decimal') def register(decimal): Inexact.register(decimal.Decimal) The function ``register`` is registered as callback for the module named 'decimal'. When decimal is imported the function is called with the module object as argument. While this particular example isn't necessary in practice, (as decimal.Decimal will inherit from the appropriate abstract Number base class in 2.6 and 3.0), it still illustrates the principle. Existing implementations ======================== There are two major implementations for lazy imports in the Python world. PJE's peak.util.imports [3] supports lazy modules an post load hooks. My implementation shares a lot with his and it's partly based on his ideas. Zope 3's zope.deferredimport doesn't have post import hooks but it has additional methods for deprecation warnings. Post import hook implementation =============================== Post import hooks are called after a module has been loaded. The hooks are callable which take one argument, the module instance. They are registered by the dotted name of the module, e.g. 'os' or 'os.path'. The callable are stored in the dict ``sys.post_import_hooks`` which is a mapping from names (as string) to a list of callables or None. States ------ No hook was registered '''''''''''''''''''''' sys.post_import_hooks contains no entry for the module A hook is registered and the module is not loaded yet ''''''''''''''''''''''''''''''''''''''''''''''''''''' The import hook registry contains an entry sys.post_import_hooks["name"] = [hook1] A module is successfully loaded ''''''''''''''''''''''''''''''' The import machinery checks if sys.post_import_hooks contains post import hooks for the newly loaded module. If hooks are found then the hooks are called in the order they were registered with the module instance as first argument. The processing of the hooks is stopped when a method raises an exception. At the end the entry for the module name is removed from sys.post_import_hooks, even when an error has occured. A module can't be loaded '''''''''''''''''''''''' The import hooks are neither called nor removed from the registry. It may be possible to load the module later. A hook is registered but the module is already loaded ''''''''''''''''''''''''''''''''''''''''''''''''''''' The hook is fired immediately. C API ----- New PyImport_* API functions '''''''''''''''''''''''''''' PyObject* PyImport_GetPostImportHooks(void) Returns the dict sys.post_import_hooks or NULL PyObject* PyImport_NotifyModuleLoaded(PyObject *module) Notify the post import system that a module was requested. Returns the module or NULL if an error has occured. PyObject* PyImport_RegisterPostImportHook(PyObject *callable, PyObject *mod_name) Register a new hook ``callable`` for the module ``mod_name`` The PyImport_PostImportNotify() method is called by PyImport_ImportModuleLevel():: PyImport_ImportModuleLevel(...) { ... result = import_module_level(name, globals, locals, fromlist, level); result = PyImport_PostImportNotify(result); ... } Python API ---------- The import hook registry and two new API methods are exposed through the ``sys`` and ``imp`` module. sys.post_import_hooks The dict contains the post import hooks: {"name" : [hook1, hook2, ...], ...} imp.register_post_import_hook(hook, name) imp.notify_module_loaded(module) -> module The when_imported function decorator is also in the imp module, which is equivalent to: def when_imported(name): def register(hook): register_post_import_hook(hook, name) return register Lazy import implementation ========================== Lazy import (also known as deferred import) makes a module object available without locating and loading the actual file for the module. The real module is loaded upon the first attribute access using the standard import mechanism. Only a limited set of attributes can be read w/o loading the real module, that is ``__name__`` and ``__lazy_import__``. The former variable is used to load the actual module while the second signals the lazyness of the module. It's not required for the C implementation but it was added for user implementation of lazy modules as requested by PJE <<Reference here would be good>>. Every read attempt to another attribute or every write attempt causes the real module to be loaded. If the load fails a ``LazyImportError`` (subclass of ``ImportError`` is raised and future access of the module object will raise the same error. The real module doesn't replace the lazy module. References to the lazy module are still valid and don't cause another read attempt. The implementation assigns real->md_dict lazy->md_dict (the __dict__ attributes) so that every read and write to the former lazy module ends up in the real module's namespace __dict__. The code also tries to unload the real module but it may not be possible when e.g mod_a loads mod_b, mod_b loads mod_c and mod_c import mod_a again. This doesn't cause a problem with the namespace dict but the identity check ``mod_c.mod_a is mod_a`` may be false. A puer Python implementation of the loader code may look like this (pseudo code):: lazy = sys.modules[name] del sys.modules[name] real = __import__(name) lazy.__dict__ = real.__dict__ sys.modules[name] = lazy The real module or an imported module by the real module may keep a reference to the real module instance. Because both the formerly lazy module instance and the real module share the same __dict__ every modification on one module is instantly available on the other object. C API ----- The module object struct gains two more entries. ``md_name`` holds the name of a lazy module (the __name__ attribute) and ``md_lazy`` signals the import status. PyModuleType changes '''''''''''''''''''' typedef enum { Py_MOD_INVALID = -1, Py_MOD_LOADED, Py_MOD_LAZY, Py_MOD_KEEP_DICT } PyModule_State; typedef struct { PyObject_HEAD PyObject *md_dict; PyObject *md_name; PyModule_State md_lazy; } PyModuleObject; PyObject * PyModule_NewLazy(const char *name) Creates a new lazy module instance int PyModule_IsLazy(PyObject *module) Checks if the module is lazy. The function first checks module->md_lazy. If ``md_lazy`` is Py_MOD_LOADED it also checks the attribute __lazy_import__. Py_MOD_INVALID real module can't be loaded, further attribute access raises an error Py_MOD_LOADED module is loaded Py_MOD_LAZY module is lazy, write and read access except __name__ and __lazy_import__ will load the real module. Py_MOD_KEEP_DICT Intermediate state of a real module, md_dict isn't cleared The last state is requires to prevent ``module_dealloc`` from replacing the values of the module dict with None. Python API ---------- ``__lazy_import__`` module attribute The module attribute ``__lazy_import__`` can be used by 3rd party implements of lazy modules to signal the laziness of a module. imp.is_lazy(mod) -> bool Checks if the module is lazy, falls back to ``__lazy_import__`` imp.import_lazy(name) -> module instance (lazy) Imports a module lazy, e.g. ``import_lazy("spam.ham")`` puts *spam.ham* in sys modules and returns the *spam.ham* module with actually loading it. imp.new_lazy_module(name) -> module instance Create a new lazy module instance w/o putting it into sys.modules imp.when_imported(name) -> decorator function for @when_imported(name) def hook(module): pass Open issues =========== Nick: There also needs to be a discussion of the import lock and potential hidden deadlock issues. Specifically, the first access to the lazy module that causes the real module to be loaded will attempt to acquire the import lock. Carelessly mixing lazy importing with threaded code is a recipe for trouble Backwards Compatibility ======================= The new features and API don't conflict with old import system of Python and don't cause any backward compatibility issues for most software. However systems like PEAK and Zope which implement their own lazy import magic need to follow some rules. The post import hook and lazy modules were carefully designed to cooperate with existing systems. It's the suggestion of the PEP author to replace own on-load-hooks with the new hook API. The alternative lazy or deferred imports will still work but the implementations must call the ``imp.notify_module_loaded`` function. Reference Implementation ======================== A reference implementation is already implemented and working. It still requires some cleanups, documentation updates and additional unit tests. Acknowledgments =============== Nick Coghlan, for proof reading and the initial discussion Phillip J. Eby, for his implementation in PEAK and help with my own implementation Copyright ========= This document has been placed in the public domain. References ========== .. [1] Interest in PEP for callbacks on module import http://permalink.gmane.org/gmane.comp.python.python-3000.devel/11126 .. [2] PEP 302: New Import Hooks http://www.python.org/dev/peps/pep-0302/ .. [3] peak.utils.imports http://svn.eby-sarna.com/Importing/peak/util/imports.py?view=markup .. [4] zope.deferredimport http://svn.zope.org/zope.deferredimport/trunk/src/zope/deferredimport/ .. Local Variables: mode: indented-text indent-tabs-mode: nil sentence-end-double-space: t fill-column: 70 coding: utf-8 End:

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