Mailman 3 February 2021 - docs

[issue37205] time.perf_counter() is not system-wide on Windows, in disagreement with documentation
by Ken Healy March 21, 2021

March 21, 2021

New submission from Ken Healy <healykb+pythonbugs(a)gmail.com>: The documentation for time.perf_counter() indicates it should return a system-wide value: https://docs.python.org/3/library/time.html#time.perf_counter This is not true on Windows, as a process-specific offset is subtracted from the underlying QueryPerformanceCounter() value. The code comments indicate this is to reduce precision loss: https://github.com/python/cpython/blob/master/Python/pytime.c#L995-L997 This is … [View More]

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[issue37891] Exceptions tutorial page does not mention raise from
by Niels Albers March 21, 2021

March 21, 2021

New submission from Niels Albers <nralbers(a)gmail.com>: raise <Exception> from <exception instance> has been in the language since python 3, yet the tutorial page teaching about exceptions does not mention it. (see https://docs.python.org/3.7/tutorial/errors.html#raising-exceptions) It would be especially helpful to language newcomers to touch on the possibility of passing error context when raising a new exception in an exception handler. ---------- assignee: docs@python … [View More]

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[issue14189] Documentation for some C APIs is missing clear specification of the type of reference they return
by Baruch Sterin March 21, 2021

March 21, 2021

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 … [View More]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> _______________________________________ [View Less]

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[issue39090] Document various options for getting the absolute path from pathlib.Path objects
by Brett Cannon March 17, 2021

March 17, 2021

New submission from Brett Cannon <brett(a)python.org>: The question on how best to get an absolute path from a pathlib.Path object keeps coming up (see https://bugs.python.org/issue29688, https://discuss.python.org/t/add-absolute-name-to-pathlib-path/2882/, and https://discuss.python.org/t/pathlib-absolute-vs-resolve/2573 as examples). As pointed out across those posts, getting the absolute path is surprisingly subtle and varied depending on your needs. As such we should probably add a … [View More]

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[issue43336] document whether io.TextIOBase.readline(size>0) will always read the full newline
by Christoph Anton Mitterer March 17, 2021

March 17, 2021

New submission from Christoph Anton Mitterer <calestyo(a)scientia.org>: Hey. It would be nice if the following behaviour could be definitely clarified: When reading from a text stream with readline(size) with a n > 0size it says: "If size is specified, at most size characters will be read." Also, depending on the settings of newlines of the stream, \r\n would be converted to \n. It's not definitely clear whether a string like "abc\r\n" read with a size of = 4 will return "abc\n" (… [View More]

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[issue29688] Document Path.absolute
by Jim Fasarakis-Hilliard March 17, 2021

March 17, 2021

New submission from Jim Fasarakis-Hilliard: Method absolute of Path objects lacked documentation, proposed PR adds relevant method to docs. ---------- assignee: docs@python components: Documentation messages: 288767 nosy: Jim Fasarakis-Hilliard, docs@python priority: normal severity: normal status: open title: Document Path.absolute versions: Python 3.5, Python 3.6, Python 3.7 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue29688> _______________________________________

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[issue32553] venv says to use python3 which does not exist in 3.6.4
by Paul Watson March 17, 2021

March 17, 2021

New submission from Paul Watson <paul.hermeneutic(a)gmail.com>: The 3.6.4 documentation on venv specifies using 'python3', but no python3 executable is in the 3.6.4 kit. https://docs.python.org/3/library/venv.html?highlight=venv#module-venv ---------- assignee: docs@python components: Documentation messages: 309943 nosy: Paul Watson, docs@python priority: normal severity: normal status: open title: venv says to use python3 which does not exist in 3.6.4 type: enhancement versions: … [View More]

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[issue15533] subprocess.Popen(cwd) documentation
by Chris Jerdonek March 17, 2021

March 17, 2021

New submission from Chris Jerdonek: The sentence describing Popen()'s cwd argument in the subprocess documentation seems reversed to me: http://docs.python.org/dev/library/subprocess.html#subprocess.Popen It says, "If cwd is not None, the child’s current directory will be changed to cwd before it is executed. Note that this directory is not considered when searching the executable, so you can’t specify the program’s path relative to cwd." However, when cwd is not None, it seems like you *… [View More]

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[issue31665] Edit "Setting [windows] environmental variables"
by Terry J. Reedy March 16, 2021

March 16, 2021

New submission from Terry J. Reedy <tjreedy(a)udel.edu>: Python Setup and Usage, 3.3.1. Excursus: Setting environment variables https://docs.python.org/3/using/windows.html#excursus-setting-environment-v… The word 'excursus' is so rare and archaic that this is my first encounter with it. Could we drop it? The last paragraph starts with "To permanently modify the default environment variables, click Start and search for ‘edit environment variables’,". This part is fine on Windows 10 … [View More]

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[issue41933] Wording of s * n in Common Sequence Operations is not optimal
by Julien Palard March 15, 2021

March 15, 2021

New submission from Julien Palard <julien+python(a)palard.fr>: As reported by Graham Ewart on docs@, in https://docs.python.org/3/library/stdtypes.html#common-sequence-operations: s * n or n * s | equivalent to adding s to itself n times is badly worded. In fact it's more like n-1 times, but yet it's not adding s to itself. I'd go for "n times the s sequence" or "n copies of the s sequence" instead, which both avoid the "n-1" and the "to itself" parts. ---------- assignee: docs@… [View More]

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