Mailman 3 February 2013 - Python-Dev

_not_found attribute on ImportError
by Chris Withers Feb. 11, 2013

Feb. 11, 2013

Hi All, I see in Python 3, some ImportErrors have grown a '_not_found' attribute. What's the significance of this attribute and where/how is it added? The only way I can seem to create this attribute is: ex = ImportError ex._not_found = True cheers, Chris -- Simplistix - Content Management, Batch Processing & Python Consulting - http://www.simplistix.co.uk

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Re: [Python-Dev] [Python-checkins] Daily reference leaks (b53b029895df): sum=2
by Eli Bendersky Feb. 11, 2013

Feb. 11, 2013

On Sun, Feb 10, 2013 at 9:00 PM, <solipsis(a)pitrou.net> wrote: > results for b53b029895df on branch "default" > -------------------------------------------- > > test_concurrent_futures leaked [2, 1, -1] memory blocks, sum=2 > > When did this start happening? Eli

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Why does Signature.from_function() have to check the type of its argument?
by Stefan Behnel Feb. 10, 2013

Feb. 10, 2013

Hi, I'm wondering about the purpose of this code in inspect.Signature.from_function(): """ if not isinstance(func, types.FunctionType): raise TypeError('{!r} is not a Python function'.format(func)) """ Is there any reason why this method would have to explicitly check the type of its argument? Why can't it just accept any object that quacks like a function? The reason why I ran into this is that I was trying to implement PEP 362 for Cython functions (which are not of Python function type types.FunctionType), and these two lines currently force me to copy the entire method body over into my code, just to build a Signature object from introspection. I find that a really bad design. Could this check please be removed completely? Or at least be changed to use isfunction() instead, so that it becomes a bit more easy to monkey patch it? (which is hard enough to explain to users already, BTW) Oh, and that's for 3.3.1, please. Stefan

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os.path.join failure mode
by Thomas Scrace Feb. 10, 2013

Feb. 10, 2013

If a function (or other non-string object) is accidentally passed as an argument to os.path.join() the result is an AttributeError: In [3]: os.path.join(fn, "path") > --------------------------------------------------------------------------- > AttributeError Traceback (most recent call last) > /home/tom/<ipython-input-3-44b097ceab04> in <module>() > ----> 1 os.path.join(fn, "path") > /usr/lib/python2.7/posixpath.pyc in join(a, *p) > 66 if b.startswith('/'): > 67 path = b > ---> 68 elif path == '' or path.endswith('/'): > 69 path += b > 70 else: > AttributeError: 'function' object has no attribute 'endswith' It's relatively easy to run into this if you mean to pass the return value of a function (fn()) as the argument but accidentally forget to append parens (()) to the callable, thus passing the function itself instead. Would it not be more helpful to raise a TypeError("Argument must be a string") than the slightly more mysterious AttributeError? It's not the most difficult error in the world to figure out, I admit, but a TypeError just seems like the more correct thing to do here. Thanks, Tom

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Force to use Py_CLEAR and Py_VISIT in example for Python extending
by Andrew Svetlov Feb. 9, 2013

Feb. 9, 2013

For now http://docs.python.org/3/extending/newtypes.html#supporting-cyclic-garbage-… at first the doc demonstrate long way than note Py_CLEAR and Py_VISIT macroses. I like to remove code similar to if (self->first) { vret = visit(self->first, arg); if (vret != 0) return vret; } and tmp = self->first; self->first = NULL; Py_XDECREF(tmp); and replace those to Py_VISIT and Py_CLEAN. I think we have to demonstrate best practices in our examples. Let's py2.7 branch live untouched, change only docs for python 3.x Any objections? -- Thanks, Andrew Svetlov

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why do we allow this syntax?
by Chris Withers Feb. 8, 2013

Feb. 8, 2013

Hi All, Just had a bit of an embarrassing incident in some code where I did: sometotal =+ somevalue I'm curious why this syntax is allowed? I'm sure there are good reasons, but thought I'd ask... Chris -- Simplistix - Content Management, Batch Processing & Python Consulting - http://www.simplistix.co.uk

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Summary of Python tracker Issues
by Python tracker Feb. 8, 2013

Feb. 8, 2013

ACTIVITY SUMMARY (2013-02-01 - 2013-02-08) Python tracker at http://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue. Do NOT respond to this message. Issues counts and deltas: open 3847 ( -1) closed 25088 (+60) total 28935 (+59) Open issues with patches: 1674 Issues opened (45) ================== #13886: readline-related test_builtin failure http://bugs.python.org/issue13886 reopened by nadeem.vawda #17102: tarfile extract can write files outside the destination path http://bugs.python.org/issue17102 opened by gregory.p.smith #17103: ampersand "&" in path prevents compilation of Python http://bugs.python.org/issue17103 opened by gheorghe.mosteoru #17104: Tk() not defined in Tkinter module http://bugs.python.org/issue17104 opened by zephyr #17108: import silently prefers package over module when both availabl http://bugs.python.org/issue17108 opened by shai #17110: sys.argv docs should explaining how to handle encoding issues http://bugs.python.org/issue17110 opened by ncoghlan #17111: test_surrogates of test_fileio fails sometimes on OS X 10.4 http://bugs.python.org/issue17111 opened by ned.deily #17112: Some doctest-based tests fail when run with python -OO http://bugs.python.org/issue17112 opened by ned.deily #17113: argparse.RawDescriptionHelpFormatter should not delete blank l http://bugs.python.org/issue17113 opened by roysmith #17115: __loader__ = None should be fine http://bugs.python.org/issue17115 opened by brett.cannon #17116: xml.parsers.expat.(errors|model) don't set the __loader__ attr http://bugs.python.org/issue17116 opened by brett.cannon #17117: Update importlib.util.module_for_loader/set_loader to set when http://bugs.python.org/issue17117 opened by brett.cannon #17119: Integer overflow when passing large string to Tkinter http://bugs.python.org/issue17119 opened by serhiy.storchaka #17120: Mishandled _POSIX_C_SOURCE and _XOPEN_SOURCE in pyconfig.h http://bugs.python.org/issue17120 opened by RAW #17121: SSH upload for distutils http://bugs.python.org/issue17121 opened by christian.heimes #17123: Add OCSP support to ssl module http://bugs.python.org/issue17123 opened by christian.heimes #17126: test_gdb fails http://bugs.python.org/issue17126 opened by ddvento(a)ucar.edu #17127: multiprocessing.dummy.Pool does not accept maxtasksperchild ar http://bugs.python.org/issue17127 opened by Noah.Yetter #17128: OS X system openssl deprecated - installer should build local http://bugs.python.org/issue17128 opened by ned.deily #17130: Add runcall() function to profile.py and cProfile.py http://bugs.python.org/issue17130 opened by gvanrossum #17131: subprocess.Popen.terminate can raise exception on Posix http://bugs.python.org/issue17131 opened by siona #17134: Use Windows' certificate store for CA certs http://bugs.python.org/issue17134 opened by christian.heimes #17135: imp doc should direct to importlib http://bugs.python.org/issue17135 opened by eric.araujo #17136: ctypes tests fail with clang on non-OS X http://bugs.python.org/issue17136 opened by djc #17137: Malfunctioning compiled code in Python 3.3 x64 http://bugs.python.org/issue17137 opened by pepalogik #17138: XPath error in xml.etree.ElementTree http://bugs.python.org/issue17138 opened by Antoine2008 #17140: Provide a more obvious public ThreadPool API http://bugs.python.org/issue17140 opened by ncoghlan #17141: random.vonmisesvariate() hangs for large kappa http://bugs.python.org/issue17141 opened by serhiy.storchaka #17143: trace.py uses _warn without importing it http://bugs.python.org/issue17143 opened by Dmitry.Jemerov #17144: Distutils: "sdist register upload" ignores -r argument http://bugs.python.org/issue17144 opened by gwrtheyrn #17145: memoryview(array.array) http://bugs.python.org/issue17145 opened by dbrecht #17146: Improve test.support.import_fresh_module() http://bugs.python.org/issue17146 opened by eric.snow #17147: BytesIO should be mentioned in SpooledTemporaryFile documentat http://bugs.python.org/issue17147 opened by serhiy.storchaka #17148: mingw: nt thread model detection http://bugs.python.org/issue17148 opened by rpetrov #17149: random.vonmisesvariate() results range is inconsistent for sma http://bugs.python.org/issue17149 opened by serhiy.storchaka #17150: pprint could use line continuation for long string literals http://bugs.python.org/issue17150 opened by pitrou #17152: Array module should support "boolean" natively http://bugs.python.org/issue17152 opened by jcea #17153: tarfile extract fails when Unicode in pathname http://bugs.python.org/issue17153 opened by vinay.sajip #17154: the 'ignore' pdb command raises IndexError http://bugs.python.org/issue17154 opened by xdegaye #17155: Logging throwing UnicodeEncodeError exception http://bugs.python.org/issue17155 opened by Kronuz #17156: Tools/i18n/pygettext.py doesn't parse unicode string. http://bugs.python.org/issue17156 opened by umedoblock #17157: issubclass() should accept iterables in 2nd arg http://bugs.python.org/issue17157 opened by ramchandra.apte #17158: help() module searcher text is misleading http://bugs.python.org/issue17158 opened by ramchandra.apte #17159: Remove explicit type check from inspect.Signature.from_functio http://bugs.python.org/issue17159 opened by scoder #17160: test_urllib2net fails http://bugs.python.org/issue17160 opened by ddvento(a)ucar.edu Most recent 15 issues with no replies (15) ========================================== #17160: test_urllib2net fails http://bugs.python.org/issue17160 #17158: help() module searcher text is misleading http://bugs.python.org/issue17158 #17155: Logging throwing UnicodeEncodeError exception http://bugs.python.org/issue17155 #17154: the 'ignore' pdb command raises IndexError http://bugs.python.org/issue17154 #17153: tarfile extract fails when Unicode in pathname http://bugs.python.org/issue17153 #17148: mingw: nt thread model detection http://bugs.python.org/issue17148 #17147: BytesIO should be mentioned in SpooledTemporaryFile documentat http://bugs.python.org/issue17147 #17140: Provide a more obvious public ThreadPool API http://bugs.python.org/issue17140 #17138: XPath error in xml.etree.ElementTree http://bugs.python.org/issue17138 #17131: subprocess.Popen.terminate can raise exception on Posix http://bugs.python.org/issue17131 #17130: Add runcall() function to profile.py and cProfile.py http://bugs.python.org/issue17130 #17127: multiprocessing.dummy.Pool does not accept maxtasksperchild ar http://bugs.python.org/issue17127 #17120: Mishandled _POSIX_C_SOURCE and _XOPEN_SOURCE in pyconfig.h http://bugs.python.org/issue17120 #17119: Integer overflow when passing large string to Tkinter http://bugs.python.org/issue17119 #17116: xml.parsers.expat.(errors|model) don't set the __loader__ attr http://bugs.python.org/issue17116 Most recent 15 issues waiting for review (15) ============================================= #17159: Remove explicit type check from inspect.Signature.from_functio http://bugs.python.org/issue17159 #17156: Tools/i18n/pygettext.py doesn't parse unicode string. http://bugs.python.org/issue17156 #17148: mingw: nt thread model detection http://bugs.python.org/issue17148 #17147: BytesIO should be mentioned in SpooledTemporaryFile documentat http://bugs.python.org/issue17147 #17145: memoryview(array.array) http://bugs.python.org/issue17145 #17143: trace.py uses _warn without importing it http://bugs.python.org/issue17143 #17141: random.vonmisesvariate() hangs for large kappa http://bugs.python.org/issue17141 #17137: Malfunctioning compiled code in Python 3.3 x64 http://bugs.python.org/issue17137 #17111: test_surrogates of test_fileio fails sometimes on OS X 10.4 http://bugs.python.org/issue17111 #17095: Modules/Setup *shared* support broken http://bugs.python.org/issue17095 #17094: sys._current_frames() reports too many/wrong stack frames http://bugs.python.org/issue17094 #17089: Expat parser parses strings only when XML encoding is UTF-8 http://bugs.python.org/issue17089 #17086: backport cross-build patches to the 2.7 branch http://bugs.python.org/issue17086 #17082: Fix test discovery for test_dbm*.py http://bugs.python.org/issue17082 #17080: A better error message for float() http://bugs.python.org/issue17080 Top 10 most discussed issues (10) ================================= #17137: Malfunctioning compiled code in Python 3.3 x64 http://bugs.python.org/issue17137 18 msgs #17121: SSH upload for distutils http://bugs.python.org/issue17121 15 msgs #5308: cannot marshal objects with more than 2**31 elements http://bugs.python.org/issue5308 12 msgs #17047: Fix double double words words http://bugs.python.org/issue17047 11 msgs #13355: random.triangular error when low = high=mode http://bugs.python.org/issue13355 10 msgs #16038: ftplib: unlimited readline() from connection http://bugs.python.org/issue16038 10 msgs #17128: OS X system openssl deprecated - installer should build local http://bugs.python.org/issue17128 10 msgs #17108: import silently prefers package over module when both availabl http://bugs.python.org/issue17108 9 msgs #16555: Add es_cu to locale aliases http://bugs.python.org/issue16555 8 msgs #17100: rotating an ordereddict http://bugs.python.org/issue17100 8 msgs Issues closed (58) ================== #2840: Expat parser locks XML source file if ContentHandler raises an http://bugs.python.org/issue2840 closed by serhiy.storchaka #3754: cross-compilation support for python build http://bugs.python.org/issue3754 closed by rpetrov #3871: cross and native build of python for mingw* hosts http://bugs.python.org/issue3871 closed by doko #4011: Create DAG for PEP 101 http://bugs.python.org/issue4011 closed by georg.brandl #5289: ctypes.util.find_library does not work under Solaris http://bugs.python.org/issue5289 closed by python-dev #6972: zipfile.ZipFile overwrites files outside destination path http://bugs.python.org/issue6972 closed by gregory.p.smith #8754: quote bad module name in ImportError-like messages http://bugs.python.org/issue8754 closed by brett.cannon #11159: Sax parser crashes if given unicode file name http://bugs.python.org/issue11159 closed by serhiy.storchaka #12177: re.match raises MemoryError http://bugs.python.org/issue12177 closed by serhiy.storchaka #12268: file readline, readlines & readall methods can lose data on EI http://bugs.python.org/issue12268 closed by gregory.p.smith #12779: Update packaging documentation http://bugs.python.org/issue12779 closed by eric.araujo #13192: ImportError silences low-level OS errors http://bugs.python.org/issue13192 closed by pitrou #13541: HTTPResponse (urllib) has no attribute read1 needed for TextIO http://bugs.python.org/issue13541 closed by serhiy.storchaka #14263: switch_index_if_fails fails on py2 http://bugs.python.org/issue14263 closed by serhiy.storchaka #14340: Update embedded copy of expat - fix security & crash issues http://bugs.python.org/issue14340 closed by gregory.p.smith #14580: imp.reload can fail for sub-modules http://bugs.python.org/issue14580 closed by brett.cannon #14724: kill imp.load_dynamic's third argument http://bugs.python.org/issue14724 closed by brett.cannon #14940: Usage documentation for pysetup http://bugs.python.org/issue14940 closed by eric.araujo #15116: remove out-of-date Mac application scripting documentation http://bugs.python.org/issue15116 closed by ned.deily #15298: _sysconfigdata is generated in srcdir, not builddir http://bugs.python.org/issue15298 closed by ned.deily #15344: devinabox: failure when running make_a_box multiple times http://bugs.python.org/issue15344 closed by brett.cannon #15359: Sockets support for CAN_BCM http://bugs.python.org/issue15359 closed by neologix #15483: CROSS: initialise include and library paths in setup.py http://bugs.python.org/issue15483 closed by rpetrov #15633: httplib.response is not closed after all data has been read http://bugs.python.org/issue15633 closed by pitrou #15881: multiprocessing 'NoneType' object is not callable http://bugs.python.org/issue15881 closed by benjamin.peterson #16137: Using time.asctime() with an array with negative tm_hour cause http://bugs.python.org/issue16137 closed by belopolsky #16256: permissions wrong on Mac doc dir http://bugs.python.org/issue16256 closed by ned.deily #16526: Python does not cross compile properly http://bugs.python.org/issue16526 closed by doko #16698: test_posix.test_getgroups fails on some systems http://bugs.python.org/issue16698 closed by ned.deily #16723: io.TextIOWrapper on urllib.request.urlopen terminates prematur http://bugs.python.org/issue16723 closed by serhiy.storchaka #16811: email.message.Message flatten dies of list index out of range http://bugs.python.org/issue16811 closed by r.david.murray #16903: subprocess.Popen.communicate with universal_newlines=True does http://bugs.python.org/issue16903 closed by serhiy.storchaka #16948: email.mime.text.MIMEText: QP encoding broken with charset!=ISO http://bugs.python.org/issue16948 closed by r.david.murray #17015: mock could be smarter and inspect the spec's signature http://bugs.python.org/issue17015 closed by pitrou #17034: Use Py_CLEAR() in stringobject.c and bytesobject.c http://bugs.python.org/issue17034 closed by serhiy.storchaka #17069: HTTP result code in urllib2.urlopen() file object undocumented http://bugs.python.org/issue17069 closed by orsenthil #17073: Integer overflow in sqlite module http://bugs.python.org/issue17073 closed by serhiy.storchaka #17076: shutil.copytree failing on xattr-less filesystems (like NFS) http://bugs.python.org/issue17076 closed by hynek #17077: Fix test_tools hangs http://bugs.python.org/issue17077 closed by serhiy.storchaka #17091: thread.lock.acquire docstring bug http://bugs.python.org/issue17091 closed by r.david.murray #17092: Disable TIPC in configure http://bugs.python.org/issue17092 closed by ddvento(a)ucar.edu #17098: Set __loader__ on modules imported by the C level http://bugs.python.org/issue17098 closed by brett.cannon #17105: Python 3.2 segfault http://bugs.python.org/issue17105 closed by skrah #17106: assertion error in IO reading text file as binary http://bugs.python.org/issue17106 closed by serhiy.storchaka #17107: test_sni in test_urllib2net could be enabled http://bugs.python.org/issue17107 closed by pitrou #17109: unittest.mock has wrong heading levels http://bugs.python.org/issue17109 closed by python-dev #17114: Python IDLE GUI does not open in Ubuntu 12.04 http://bugs.python.org/issue17114 closed by serhiy.storchaka #17118: Add tests for testing Python-Tcl interaction http://bugs.python.org/issue17118 closed by serhiy.storchaka #17122: Fix and cleanup test_functools http://bugs.python.org/issue17122 closed by serhiy.storchaka #17124: import subprocess hangs for ~25 seconds, time.py file in dir - http://bugs.python.org/issue17124 closed by neologix #17125: tokenizer.tokenize passes a bytes object to str.startswith http://bugs.python.org/issue17125 closed by r.david.murray #17129: Include CA bundle and provide access to system's CA http://bugs.python.org/issue17129 closed by eric.araujo #17132: yield_arg missing from symbol.sym_name http://bugs.python.org/issue17132 closed by python-dev #17133: ssl.wrap_socket doesn't take server_hostname as a kwarg http://bugs.python.org/issue17133 closed by pitrou #17139: dateTime.now() return format missing decimal seconds. http://bugs.python.org/issue17139 closed by mark.dickinson #17142: test_any calls all() instead of any() http://bugs.python.org/issue17142 closed by r.david.murray #17151: Python 3 changement of behavior with __ne__: documentation not http://bugs.python.org/issue17151 closed by mark.dickinson #1597850: Cross compiling patches for MINGW http://bugs.python.org/issue1597850 closed by hanwen

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help with knowledge on how to find which release a fix will land in
by Chris Withers Feb. 8, 2013

Feb. 8, 2013

Hi All, Where would I look to find out which release a fix for an issue (http://bugs.python.org/issue15822 if you're interested ;-)) will land in? cheers, Chris -- Simplistix - Content Management, Batch Processing & Python Consulting - http://www.simplistix.co.uk

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PyConTW is calling for proposals!
by LittleQ Feb. 7, 2013

Feb. 7, 2013

(link: PyConTW is calling for proposals!) http://tw.pycon.org/2013/en/blog/2012/11/21/call-for-proposals-en/ Hello, everyone! I'm Colin Su (LittleQ), Public Relation @ PyConTW. PyCon Taiwan is calling for proposals now, Python is becoming one of famous programming languages in Taiwan, We need every Python developers' participating. Go to the link above, and submit your proposal right now! :D Feel free to send me an email if you have any question. Have a nice Day, Colin, PR @ PyConTW (if this mail is not appropriate on this mailing list (python-dev), just let me know, then I won't bother everybody anymore, thanks.) -- { greeting: "Have a nice day!", name: "Colin Su", nickname: "LittleQ", email: "littleq0903(a)gmail.com", website: "http://about.me/littleq", title: [ ["Genie Capital", "Web Developer"], ["National Chengchi University", "Student", "Computer Science Dept." ] ] }

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PyCon Tickets Almost Sold Out
by Brian Curtin Feb. 7, 2013

Feb. 7, 2013

Since the Language Summit is held at PyCon I think this counts as on-topic... If you're interested in going to the conference, there are under 50 tickets remaining: https://us.pycon.org/2013/registration/

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