docs January 2020

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27 participants
288 discussions

[issue37082] Assignment expression operator (walrus) not in built-in help()

by Matthias Bussonnier

New submission from Matthias Bussonnier <bussonniermatthias(a)gmail.com>: Do the following at a Python prompt: ``` >>> help() Welcome to Python 3.8's help utility! [...]SNIP help> symbols Here is a list of the punctuation symbols which Python assigns special meaning to. Enter any symbol to get more help. != + <= __ " += <> ` """ , == b" % - > b' %= -= >= f" & . >> f' &= ... >>= j ' / @ r" ''' // J r' ( //= [ u" ) /= \ u' * : ] | ** < ^ |= **= << ^= ~ *= <<= _ ``` Oh no ! Our favorite `:=` is missing :-( ---------- assignee: docs@python components: Documentation messages: 343813 nosy: docs@python, mbussonn priority: normal severity: normal status: open title: Assignment expression operator (walrus) not in built-in help() versions: Python 3.8, Python 3.9 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue37082> _______________________________________

2 months

[issue39417] Link to "Python Packaging User Guide: Creating and using virtual environments" is broken

by Angel Cervera Claudio

New submission from Angel Cervera Claudio <angelcervera(a)silyan.com>: The link "See also: Python Packaging User Guide: Creating and using virtual environments" Is broken. The problem is in line 30 of https://github.com/python/cpython/blob/3.8/Doc/library/venv.rst I don't know the right link, so I can not fix it. I any one provive me the right link, I can create a PR. ---------- assignee: docs@python components: Documentation messages: 360454 nosy: angelcervera, docs@python priority: normal severity: normal status: open title: Link to "Python Packaging User Guide: Creating and using virtual environments" is broken versions: Python 3.8 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue39417> _______________________________________

2 months, 2 weeks

[issue26205] Inconsistency concerning nested scopes

by Roscoe R.Higgins

New submission from Roscoe R.Higgins: In chapter 9. Classes of the Python3.5 documentation it says: "At any time during execution, there are at least three nested scopes whose namespaces are directly accessible:", followed by a list containing 4 items. Further down a middle scope is mentioned (although mentioned by name). This was confusing for a while. ---------- assignee: docs@python components: Documentation messages: 258941 nosy: Roscoe R. Higgins, docs@python priority: normal severity: normal status: open title: Inconsistency concerning nested scopes type: behavior versions: Python 3.5 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue26205> _______________________________________

2 months, 3 weeks

[issue28681] About function renaming in the tutorial

by Xue Fuqiao

New submission from Xue Fuqiao: In https://hg.python.org/cpython/file/6fbb7c9d77c6/Doc/tutorial/controlflow.rs… : A function definition introduces the function name in the current symbol table. The value of the function name has a type that is recognized by the interpreter as a user-defined function. This value can be assigned to another name which can then also be used as a function. This serves as a general renaming mechanism Maybe "aliasing" is a better term than "renaming" here, since the original function name can still be used after the "renaming". ---------- assignee: docs@python components: Documentation files: renaming.patch keywords: patch messages: 280683 nosy: docs@python, xfq priority: normal severity: normal status: open title: About function renaming in the tutorial type: enhancement versions: Python 3.3, Python 3.4, Python 3.5, Python 3.6, Python 3.7 Added file: http://bugs.python.org/file45468/renaming.patch _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue28681> _______________________________________

2 months, 3 weeks

[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> _______________________________________

2 months, 3 weeks

[issue31305] 'pydoc -w import' report "no Python documentation found for 'import'"

by Karthikeyan Singaravelan

New submission from Karthikeyan Singaravelan <tir.karthi(a)gmail.com>: > Run "pydoc -w <name>" to write out the HTML documentation for a module to a file named "<name>.html". As mentioned in the help this works only for modules and since import is a keyword it throws an error. Maybe this could be added as an enhancement? Thanks ---------- nosy: +xtreak _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue31305> _______________________________________

2 months, 3 weeks

[issue21333] Document recommended exception for objects that shouldn't be pickled

by Stefan Schwarzer

New submission from Stefan Schwarzer: I recently was confused whether to raise a `PicklingError` or `TypeError` in `__getstate__` if objects of my class can't and shouldn't be pickled. [1] Terry Reedy advised I should use `TypeError`. [2] I wonder if the `pickle` module documention should explicitly recommend using `TypeError` if a class wants to say that its objects can't be pickled. What do you think? [1] https://mail.python.org/pipermail/python-list/2014-April/670987.html [2] https://mail.python.org/pipermail/python-list/2014-April/671002.html ---------- assignee: docs@python components: Documentation messages: 217054 nosy: docs@python, sschwarzer priority: normal severity: normal status: open title: Document recommended exception for objects that shouldn't be pickled type: enhancement versions: Python 3.5 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue21333> _______________________________________

2 months, 3 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> _______________________________________

2 months, 3 weeks

[issue33864] collections.abc.ByteString does not register memoryview

by Jason Fried

New submission from Jason Fried <me(a)jasonfried.info>: Looking at the typing Module docs in the section for ByteString This type represents the types bytes, bytearray, and memoryview. But collections.abc.ByteString does not have memoryview registered. Is it because memoryview doesn't support .index()? ---------- assignee: docs@python components: Documentation messages: 319557 nosy: docs@python, fried, lukasz.langa priority: normal severity: normal status: open title: collections.abc.ByteString does not register memoryview type: behavior versions: Python 3.6, Python 3.7, Python 3.8 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue33864> _______________________________________

2 months, 3 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> _______________________________________

2 months, 3 weeks

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docs January 2020