docs September 2013

docs@python.org

33 participants
504 discussions

[issue9499] Python C/API Execution namespace undocumented. (patch included)

by Campbell Barton

New submission from Campbell Barton <ideasman42(a)gmail.com>: Some parts of the python api expect __main__ module dictionary to be the namespace when executing a script, this is true when running a python script from the python binary but NOT true when running a compiled script from the C/API which can lead to bugs which are not easy to solve unless the C/API author knows this. ---------- assignee: docs@python components: Documentation files: doc_py3_main_mod.diff keywords: patch messages: 112706 nosy: docs@python, ideasman42 priority: normal severity: normal status: open title: Python C/API Execution namespace undocumented. (patch included) type: behavior versions: Python 3.2 Added file: http://bugs.python.org/file18357/doc_py3_main_mod.diff _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue9499> _______________________________________

22 hours, 2 minutes

[issue12174] Multiprocessing logging levels unclear

by JJeffries

New submission from JJeffries <jamesjeffries1(a)gmail.com>: It is unclear without reference to the logging module where the multiprocessing logging levels fit in the normal logging provided by the logging module, even though it says above the table "The table below illustrates where theses fit in the normal level hierarchy. +----------------+----------------+ | Level | Numeric value | +================+================+ | ``SUBWARNING`` | 25 | +----------------+----------------+ | ``SUBDEBUG`` | 5 | +----------------+----------------+" I propose adding further values from the logging module for clarification. ---------- assignee: docs@python components: Documentation messages: 136839 nosy: JJeffries, docs@python priority: normal severity: normal status: open title: Multiprocessing logging levels unclear versions: Python 3.3 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue12174> _______________________________________

22 hours, 40 minutes

[issue13047] imp.find_module("") and imp.find_module(".")

by Arfrever Frehtes Taifersar Arahesis

New submission from Arfrever Frehtes Taifersar Arahesis <Arfrever.FTA(a)GMail.Com>: It's undocumented that imp.find_module("") and imp.find_module(".") try to find __init__.py. There is also a small difference in behavior between them. sys.path by default contains "" as the first element, which is sufficient for imp.find_module("."), but not for imp.find_module(""): $ mkdir /tmp/imp_tests $ cd /tmp/imp_tests $ touch __init__.py $ python3.3 -c 'import imp, sys; print(repr(sys.path[0])); print(imp.find_module("."))' '' (None, '.', ('', '', 5)) $ python3.3 -c 'import imp, sys; print(repr(sys.path[0])); print(imp.find_module(""))' '' Traceback (most recent call last): File "<string>", line 1, in <module> ImportError: No module named '' If sys.path contains path (e.g. "." or absolute path) to directory with __init__.py file, then imp.find_module("") will succeed: $ PYTHONPATH="." python3.3 -c 'import imp, sys; print(repr(sys.path[0:2])); print(imp.find_module("."))' ['', '/tmp/imp_tests'] (None, '.', ('', '', 5)) $ PYTHONPATH="." python3.3 -c 'import imp, sys; print(repr(sys.path[0:2])); print(imp.find_module(""))' ['', '/tmp/imp_tests'] (None, '/tmp/imp_tests/', ('', '', 5)) $ python3.3 -c 'import imp, sys; sys.path.insert(1, "."); print(repr(sys.path[0:2])); print(imp.find_module("."))' ['', '.'] (None, '.', ('', '', 5)) $ python3.3 -c 'import imp, sys; sys.path.insert(1, "."); print(repr(sys.path[0:2])); print(imp.find_module(""))' ['', '.'] (None, './', ('', '', 5)) I think that imp.find_module(".") and imp.find_module("") should have the same behavior, and this behavior should be documented. ---------- assignee: docs@python components: Documentation, Interpreter Core messages: 144531 nosy: Arfrever, docs@python priority: normal severity: normal status: open title: imp.find_module("") and imp.find_module(".") versions: Python 2.7, Python 3.2, Python 3.3 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue13047> _______________________________________

1 day, 1 hour

[issue14979] pdb: Link to source

by anatoly techtonik

New submission from anatoly techtonik <techtonik(a)gmail.com>: http://docs.python.org/library/pdb.html#pdb.Pdb Documentation for pdb says: "The debugger is extensible — it is actually defined as the class Pdb. This is currently undocumented but easily understood by reading the source." There should a link to the source. ---------- assignee: docs@python components: Documentation, Library (Lib) messages: 162074 nosy: docs@python, techtonik priority: normal severity: normal status: open title: pdb: Link to source _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue14979> _______________________________________

1 day, 2 hours

[issue18280] Documentation is too personalized

by Serhiy Storchaka

New submission from Serhiy Storchaka: Some documentation files contain a number of I/my/me. Looks like they grew from personal modules and personal articles. Perhaps the official documentation needs more depersonalized style. Here is full list of such files: Doc/c-api/exceptions.rst Doc/c-api/long.rst Doc/distutils/builtdist.rst Doc/extending/extending.rst Doc/extending/windows.rst Doc/howto/argparse.rst Doc/howto/curses.rst Doc/howto/functional.rst Doc/howto/regex.rst Doc/howto/sockets.rst Doc/howto/urllib2.rst Doc/install/index.rst Doc/library/audioop.rst Doc/library/ctypes.rst Doc/library/doctest.rst Doc/library/heapq.rst Doc/library/numbers.rst Doc/library/ossaudiodev.rst Doc/library/tk.rst Doc/library/unittest.mock-examples.rst Doc/library/unittest.mock.rst Doc/reference/introduction.rst Doc/tutorial/classes.rst The list doesn't include FAQs where it may be appropriate and whatsnew files. Andrew Kuchling recently has fixed Doc/howto/unicode.rst for this issue (as part of issue4153). ---------- assignee: docs@python components: Documentation messages: 191636 nosy: akuchling, docs@python, eric.araujo, ezio.melotti, georg.brandl, serhiy.storchaka priority: normal severity: normal status: open title: Documentation is too personalized versions: Python 2.7, Python 3.3, Python 3.4 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue18280> _______________________________________

1 month

[issue13828] Further improve casefold documentation

by Jim Jewett

New submission from Jim Jewett <jimjjewett(a)gmail.com>: > http://hg.python.org/cpython/rev/0b5ce36a7a24 > changeset: 74515:0b5ce36a7a24 > + Casefolding is similar to lowercasing but more aggressive because it is > + intended to remove all case distinctions in a string. For example, the German > + lowercase letter ``'ß'`` is equivalent to ``"ss"``. Since it is already > + lowercase, :meth:`lower` would do nothing to ``'ß'``; :meth:`casefold` > + converts it to ``"ss"``. Perhaps add the recommendation to canonicalize as well. A complete, but possibly too long, try is below: Casefolding is similar to lowercasing but more aggressive because it is intended to remove all case distinctions in a string. For example, the German lowercase letter ``'ß'`` is equivalent to ``"ss"``. Since it is already lowercase, :meth:`lower` would do nothing to ``'ß'``; :meth:`casefold` converts it to ``"ss"``. Note that most case-insensitive matches should also match compatibility equivalent characters. The casefolding algorithm is described in section 3.13 of the Unicode Standard. Per D146, a compatibility caseless match can be achieved by from unicodedata import normalize def caseless_compat(string): nfd_string = normalize("NFD", string) nfkd1_string = normalize("NFKD", nfd_string.casefold()) return normalize("NFKD", nfkd1_string.casefold()) ---------- assignee: docs@python components: Documentation messages: 151644 nosy: Jim.Jewett, benjamin.peterson, docs@python priority: normal severity: normal status: open title: Further improve casefold documentation versions: Python 3.3 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue13828> _______________________________________

2 months

[issue17576] PyNumber_Index() is not int-subclass friendly

by Barry A. Warsaw

New submission from Barry A. Warsaw: operator.index() is just a thin wrapper around PyNumber_Index(). The documentation for operator.index() claims that it is equivalent to calling obj.__index__() but for subclasses of int, this is not true. In fact, PyNumber_Index() first does (e.g. in Python 3.3) a PyLong_Check() and if that succeeds, the original object is returned *without* doing the moral equivalent in C of calling obj.__index__(). An example: class myint(int): def __index__(self): return int(self) + 1 >>> x = myint(7) >>> x.__index__() 8 >>> from operator import index >>> index(x) 7 The C API documents PyNumber_Index() as: "Returns the o converted to a Python int on success or NULL with a TypeError exception raised on failure." Because this has been the behavior of PyNumber_Index() since at least 2.7 (I didn't check farther back), this probably cannot be classified as a bug deserving to be fixed in the code for older Pythons. It might be worth fixing for Python 3.4, i.e. by moving the index check before the type check. In the meantime, this is probably a documentation bug. The C API implies, but should be clearer that if o is an int subtype (int and long in Python 2), it is returned unchanged. The operator.index() documentation should be amended to describe this behavior for int/long subclasses. A different alternative would be to leave PyNumber_Index() unchanged, but with the doco fix, and to augment operator.index() to do the PyIndex_Check() first, before calling PyNumber_Index(). That's a little more redundant, but would provide the documented behavior without changing the C API. ---------- assignee: docs@python components: Documentation messages: 185522 nosy: barry, docs@python priority: normal severity: normal status: open title: PyNumber_Index() is not int-subclass friendly type: behavior versions: Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue17576> _______________________________________

3 months, 2 weeks

[issue14189] Documentation for some C APIs is missing clear specification of the type of reference they return

by Baruch Sterin

New submission from Baruch Sterin <python(a)bsterin.com>: In addition to the description text, most C API functions have a one-line, emphasized specification whether they return a new or a borrowed reference. (e.g. 'Return value: New reference.'). The following API functions are missing that. Some of them, like PyMemoryView_FromBuffer(), have descriptions that are clear, but it would still be nice to have an unambiguous statement like most other API functions have. The list has been generated automatically, so it might contain some errors. Doc/c-api/arg.rst: Py_VaBuildValue Doc/c-api/buffer.rst: PyMemoryView_FromBuffer Doc/c-api/buffer.rst: PyMemoryView_FromObject Doc/c-api/buffer.rst: PyMemoryView_GetContiguous Doc/c-api/bytearray.rst: PyByteArray_Concat Doc/c-api/bytearray.rst: PyByteArray_FromObject Doc/c-api/bytearray.rst: PyByteArray_FromStringAndSize Doc/c-api/code.rst: PyCode_New Doc/c-api/codec.rst: PyCodec_BackslashReplaceErrors Doc/c-api/codec.rst: PyCodec_Decode Doc/c-api/codec.rst: PyCodec_Decoder Doc/c-api/codec.rst: PyCodec_Encode Doc/c-api/codec.rst: PyCodec_Encoder Doc/c-api/codec.rst: PyCodec_IgnoreErrors Doc/c-api/codec.rst: PyCodec_IncrementalDecoder Doc/c-api/codec.rst: PyCodec_IncrementalEncoder Doc/c-api/codec.rst: PyCodec_LookupError Doc/c-api/codec.rst: PyCodec_ReplaceErrors Doc/c-api/codec.rst: PyCodec_StreamReader Doc/c-api/codec.rst: PyCodec_StreamWriter Doc/c-api/codec.rst: PyCodec_StrictErrors Doc/c-api/codec.rst: PyCodec_XMLCharRefReplaceErrors Doc/c-api/exceptions.rst: PyUnicodeDecodeError_Create Doc/c-api/exceptions.rst: PyUnicodeDecodeError_GetEncoding Doc/c-api/exceptions.rst: PyUnicodeDecodeError_GetObject Doc/c-api/exceptions.rst: PyUnicodeDecodeError_GetReason Doc/c-api/exceptions.rst: PyUnicodeEncodeError_Create Doc/c-api/exceptions.rst: PyUnicodeTranslateError_Create Doc/c-api/float.rst: PyFloat_GetInfo Doc/c-api/import.rst: PyImport_GetImporter Doc/c-api/import.rst: PyImport_ImportModuleNoBlock Doc/c-api/import.rst: _PyImport_FindExtension Doc/c-api/import.rst: _PyImport_FixupExtension Doc/c-api/init.rst: PyEval_GetCallStats Doc/c-api/int.rst: PyInt_FromSize_t Doc/c-api/long.rst: PyLong_FromSize_t Doc/c-api/long.rst: PyLong_FromSsize_t Doc/c-api/number.rst: PyNumber_Index Doc/c-api/number.rst: PyNumber_ToBase Doc/c-api/object.rst: PyObject_Bytes Doc/c-api/object.rst: PyObject_GenericGetAttr Doc/c-api/unicode.rst: PyUnicode_AsUTF32String Doc/c-api/unicode.rst: PyUnicode_DecodeMBCSStateful Doc/c-api/unicode.rst: PyUnicode_DecodeUTF32 Doc/c-api/unicode.rst: PyUnicode_DecodeUTF32Stateful Doc/c-api/unicode.rst: PyUnicode_DecodeUTF7 Doc/c-api/unicode.rst: PyUnicode_DecodeUTF7Stateful Doc/c-api/unicode.rst: PyUnicode_EncodeUTF32 Doc/c-api/unicode.rst: PyUnicode_EncodeUTF7 Doc/c-api/veryhigh.rst: PyEval_EvalCodeEx Doc/c-api/veryhigh.rst: PyEval_EvalFrame Doc/c-api/veryhigh.rst: PyEval_EvalFrameEx ---------- assignee: docs@python components: Documentation messages: 154877 nosy: baruch.sterin, docs@python priority: normal severity: normal status: open title: Documentation for some C APIs is missing clear specification of the type of reference they return type: behavior versions: Python 2.7 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue14189> _______________________________________

3 months, 2 weeks

[issue17805] No such class: multiprocessing.pool.AsyncResult

by Takafumi Arakaki

New submission from Takafumi Arakaki: Document mentions AsyncResult but there is no such class. http://docs.python.org/2/library/multiprocessing.html#multiprocessing.pool.… You can check it by simply running: python -c 'from multiprocessing.pool import AsyncResult' I think it means ApplyResult so I made a patch (attached). Note that there managers.py also uses name 'AsyncResult': % hg grep AsyncResult Doc/library/multiprocessing.rst:83232:.. class:: AsyncResult Lib/multiprocessing/managers.py:81039: 'apply_async': 'AsyncResult', Lib/multiprocessing/managers.py:81039: 'map_async': 'AsyncResult', Lib/multiprocessing/managers.py:81039: 'starmap_async': 'AsyncResult', Lib/multiprocessing/managers.py:81039:SyncManager.register('AsyncResult', create_method=False) Probably renaming them would be better? ---------- assignee: docs@python components: Documentation files: ApplyResult.patch keywords: patch messages: 187466 nosy: docs@python, tkf priority: normal severity: normal status: open title: No such class: multiprocessing.pool.AsyncResult versions: Python 2.6, Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4, Python 3.5 Added file: http://bugs.python.org/file29954/ApplyResult.patch _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue17805> _______________________________________

3 months, 3 weeks

[issue17589] Make documentation about macros in C API explicit about rvalue vs statement

by Larry Hastings

New submission from Larry Hastings: CPython API "functions" implemented as macros can expand into either rvalues or statements. Most expand into statements (often using the do {} while (0) syntactic sugar trick), but occasionally they're legal as rvalues. As of this writing Py_INCREF works as an rvalue. But discussion on another tracker issue (#17206) proposes changing the implementation in such a way that it will only be usable as a statement. Although it's mildly unlikely, it's certainly possible that this will break somebody's code. I propose that the documentation make an explicit ruling on whether macros are usable as rvalues or as statements. Perhaps a blanket statement would suffice, "all macros are only supported for use as statements except where explicitly noted", then annotate specific macros that are supported for use as rvalues. Though that raises the question of acknowledging in the documentation that some things are macros--I think the documentation glosses over that fact right now. Note: I added you three (Georg, Mark, Martin) as I thought you might have an opinion on this one way or the other. If you're not interested, my apologies. ---------- assignee: docs@python components: Documentation messages: 185646 nosy: Mark.Shannon, docs@python, georg.brandl, larry, loewis priority: normal severity: normal stage: needs patch status: open title: Make documentation about macros in C API explicit about rvalue vs statement type: enhancement versions: Python 3.4 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue17589> _______________________________________

4 months

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