docs January 2020

docs@python.org

27 participants
430 discussions

[issue39369] Doc: Update mmap readline method documentation

by Wellington PF

New submission from Wellington PF <wellpardim10(a)gmail.com>: Update mmap readline method description. The fact that the readline method does update the file position should not be ignored since this might give the impression for the programmer that it doesn't update it. ---------- assignee: docs@python components: Documentation messages: 360191 nosy: docs@python, wellpardim priority: normal pull_requests: 17435 severity: normal status: open title: Doc: Update mmap readline method documentation type: enhancement _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue39369> _______________________________________

9 months, 3 weeks

[issue21297] skipinitialspace in the csv module only skips spaces, not "whitespace" in general

by Daniel Andersson

New submission from Daniel Andersson: Regarding the `skipinitialspace` parameter to the different CSV reader dialects in the `csv` module, the official documentation asserts: When True, whitespace immediately following the delimiter is ignored. and the `help(csv)` style module documentation says: * skipinitialspace - specifies how to interpret whitespace which immediately follows a delimiter. It defaults to False, which means that whitespace immediately following a delimiter is part of the following field. "Whitespace" is a bit too general in both cases (at least a red herring in the second case), since it only skips spaces and not e.g. tabs [1]. In `Modules/_csv.c`, it more correctly describes the parameter. At line 81: int skipinitialspace; /* ignore spaces following delimiter? */ and the actual implementation at line 638: else if (c == ' ' && dialect->skipinitialspace) /* ignore space at start of field */ ; No-one will probably assume that the whole UTF-8 spectrum of "whitespace" is skipped, but at least I initially assumed that the tab character was included. [1]: http://en.wikipedia.org/wiki/Whitespace_character ---------- assignee: docs@python components: Documentation, Library (Lib) messages: 216780 nosy: Daniel.Andersson, docs@python priority: normal severity: normal status: open title: skipinitialspace in the csv module only skips spaces, not "whitespace" in general type: behavior versions: Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4, Python 3.5 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue21297> _______________________________________

9 months, 3 weeks

[issue37405] socket.getsockname() returns string instead of tuple

by Brent Gardner

New submission from Brent Gardner <bggardner(a)gmail.com>: In Python 3.5.3, a socket with type AF_CAN returns a tuple in the form `(interface, )` from getsockname(). In Python 3.7.3, getsockname() returns a string (the name of the interface). The documentation states "a tuple is used for the AF_CAN address family". The string will break code that worked in 3.5.3 by raising errors such as "Value Error: too many values to unpack (expected 2)". Example: #3.5.3 import socket s = socket.socket(socket.AF_CAN, socket.SOCK_RAW, socket.CAN_RAW) s.bind(('vcan0',)) # requires tuple s.getsockname() # returns tuple: ('vcan0', 29) #3.7.3 import socket s = socket.socket(socket.AF_CAN, socket.SOCK_RAW, socket.CAN_RAW) s.bind(('vcan0',)) # requires tuple s.getsockname() # returns string: 'vcan0' ---------- assignee: docs@python components: Documentation messages: 346559 nosy: Brent Gardner, docs@python priority: normal severity: normal status: open title: socket.getsockname() returns string instead of tuple versions: Python 3.7 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue37405> _______________________________________

10 months

[issue35118] Add peek() or first() method in queue

by Windson Yang

New submission from Windson Yang <wiwindson(a)gmail.com>: I found other languages like Java and C++ have the method to access the first value in Queue like first() and peek(). Since we use deque_ to create Queue now, it's easy to implement in python using the index. Otherwise, we can add this to the document? I also found some discussion_ here. .. _deque: https://github.com/python/cpython/blob/master/Lib/queue.py#L205 .. _discussion https://mail.python.org/pipermail/python-list/2010-March/569930.html ---------- assignee: docs@python components: Documentation messages: 328963 nosy: Windson Yang, docs@python priority: normal severity: normal status: open title: Add peek() or first() method in queue type: enhancement versions: Python 2.7, Python 3.4, Python 3.5, Python 3.6, Python 3.7, Python 3.8 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue35118> _______________________________________

10 months

[issue37860] Add netlify deploy preview for docs

by Ashwin Ramaswami

New submission from Ashwin Ramaswami <aramaswamis(a)gmail.com>: It would be good to preview the cpython documentation on PRs using Netlify. See https://github.com/python/core-workflow/issues/348 ---------- assignee: docs@python components: Documentation messages: 349752 nosy: docs@python, epicfaace priority: normal severity: normal status: open title: Add netlify deploy preview for docs versions: Python 3.9 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue37860> _______________________________________

10 months

[issue37205] time.perf_counter() is not system-wide on Windows, in disagreement with documentation

by Ken Healy

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 relevant in multiprocess applications, where accurate timing is required across multiple processes. Here is a simple test case: ----------------------------------------------------------- import concurrent.futures import time def worker(): return time.perf_counter() if __name__ == '__main__': pool = concurrent.futures.ProcessPoolExecutor() futures = [] for i in range(3): print('Submitting worker {:d} at time.perf_counter() == {:.3f}'.format(i, time.perf_counter())) futures.append(pool.submit(worker)) time.sleep(1) for i, f in enumerate(futures): print('Worker {:d} started at time.perf_counter() == {:.3f}'.format(i, f.result())) ----------------------------------------------------------- Output: ----------------------------------------------------------- C:\...>Python37\python.exe -VV Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 22:22:05) [MSC v.1916 64 bit (AMD64)] C:\...>Python37\python.exe perf_counter_across_processes.py Submitting worker 0 at time.perf_counter() == 0.376 Submitting worker 1 at time.perf_counter() == 1.527 Submitting worker 2 at time.perf_counter() == 2.529 Worker 0 started at time.perf_counter() == 0.380 Worker 1 started at time.perf_counter() == 0.956 Worker 2 started at time.perf_counter() == 1.963 ----------------------------------------------------------- See my stackoverflow question for a comparison with Linux: https://stackoverflow.com/questions/56502111/should-time-perf-counter-be-co… ---------- assignee: docs@python components: Documentation, Library (Lib), Windows messages: 345057 nosy: docs@python, kh90909, paul.moore, steve.dower, tim.golden, vstinner, zach.ware priority: normal severity: normal status: open type: behavior versions: Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue37205> _______________________________________

10 months

[issue37891] Exceptions tutorial page does not mention raise from

by Niels Albers

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 components: Documentation messages: 349994 nosy: Niels Albers, docs@python priority: normal severity: normal status: open title: Exceptions tutorial page does not mention raise from versions: Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue37891> _______________________________________

10 months

[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> _______________________________________

10 months

[issue39090] Document various options for getting the absolute path from pathlib.Path objects

by Brett Cannon

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 section somewhere in the pathlib docs explaining the various ways and why you would choose one over the other. ---------- assignee: docs@python components: Documentation messages: 358638 nosy: brett.cannon, docs@python priority: normal severity: normal stage: needs patch status: open title: Document various options for getting the absolute path from pathlib.Path objects type: enhancement _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue39090> _______________________________________

10 months

[issue29688] Document Path.absolute

by Jim Fasarakis-Hilliard

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> _______________________________________

10 months

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docs January 2020