Mailman 3 August 2020 - docs

[issue22401] argparse: 'resolve' conflict handler damages the actions of the parent parser
by paul j3 27 Jan '21

27 Jan '21

New submission from paul j3: When there's a conflict involving an argument that was added via 'parents', and the conflict handler is 'resolve', the action in the parent parser may be damaged, rendering that parent unsuitable for further use. In this example, 2 parents have the same '--config' argument: parent1 = argparse.ArgumentParser(add_help=False) parent1.add_argument('--config') parent2 = argparse.ArgumentParser(add_help=False) parent2.add_argument('--config') parser = argparse.ArgumentParser(parents=[parent1,parent2], conflict_handler='resolve') The actions of the 3 parsers are (from the ._actions list): (id, dest, option_strings) parent1: [(3077384012L, 'config', [])] # empty option_strings parent2: [(3076863628L, 'config', ['--config'])] parser: [(3076864428L, 'help', ['-h', '--help']), (3076863628L, 'config', ['--config'])] # same id The 'config' Action from 'parent1' is first copied to 'parser' by reference (this is important). When 'config' from 'parent2' is copied, there's a conflict. '_handle_conflict_resolve()' attempts to remove the first Action, so it can add the second. But in the process it ends up deleting the 'option_strings' values from the original action. So now 'parent1' has an action in its 'optionals' argument group with an empty option_strings list. It would display as an 'optionals' but parse as a 'positionals'. 'parent1' can no longer be safely used as a parent for another (sub)parser, nor used as a parser itself. The same sort of thing would happen, if, as suggested in the documentation: "Sometimes (e.g. when using parents_) it may be useful to simply override any older arguments with the same option string." In test_argparse.py, 'resolve' is only tested once, with a simple case of two 'add_argument' statements. The 'parents' class tests a couple of cases of conflicting actions (for positionals and optionals), but does nothing with the 'resolve' handler. ------------------------------ Possible fixes: - change the documentation to warn against reusing such a parent parser - test the 'resolve' conflict handler more thoroughly - rewrite this conflict handler so it does not modify the action in the parent - possibly change the 'parents' mechanism so it does a deep copy of actions. References: http://stackoverflow.com/questions/25818651/argparse-conflict-resolver-for-… http://bugs.python.org/issue15271 argparse: repeatedly specifying the same argument ignores the previous ones http://bugs.python.org/issue19462 Add remove_argument() method to argparse.ArgumentParser http://bugs.python.org/issue15428 add "Name Collision" section to argparse docs ---------- assignee: docs@python components: Documentation, Library (Lib), Tests messages: 226862 nosy: docs@python, paul.j3 priority: normal severity: normal status: open title: argparse: 'resolve' conflict handler damages the actions of the parent parser type: behavior versions: Python 3.5 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue22401> _______________________________________

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[issue36675] Doctest directives and comments not visible or missing from code samples
by Steven D'Aprano 25 Jan '21

25 Jan '21

New submission from Steven D'Aprano <steve+python(a)pearwood.info>: (Apologies if this is the wrong place for reporting website bugs.) The website is not rendering doctest directives or comments, either that or the comments have been stripped from the examples. On the doctest page itself, all the comments are missing: https://docs.python.org/3/library/doctest.html#directives The first example says: >>> print(list(range(20))) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19] but without the directive, the test would fail. Screen shot attached. Doctest directives are also missing from here: https://docs.python.org/3/library/ctypes.html My browser: Firefox 45.1.1 Also checked with text browser "lynx". ---------- assignee: docs@python components: Documentation files: missing_directives.png messages: 340570 nosy: docs@python, steven.daprano priority: normal severity: normal status: open title: Doctest directives and comments not visible or missing from code samples type: behavior Added file: https://bugs.python.org/file48277/missing_directives.png _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue36675> _______________________________________

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[issue40745] Typo in library/typing
by Héctor Canto 23 Jan '21

23 Jan '21

New submission from Héctor Canto <hectorcanto(a)gmail.com>: I found a small typo here: https://docs.python.org/3.8/library/typing.html?highlight=typing#typing.New… I checked also in other 3.x versions and it is there too. Original: A helper function to indicate a distinct types to a typechecker, see NewType Possible solution (remove the "s" in types): A helper function to indicate a distinct type to a typechecker, see NewType ---------- assignee: docs@python components: Documentation messages: 369730 nosy: docs@python, hectorcanto priority: normal severity: normal status: open title: Typo in library/typing type: enhancement versions: Python 3.10, 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/issue40745> _______________________________________

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[issue40304] Classes created using type() don't need to explicitly inherit from object
by Борис Верховский 22 Jan '21

22 Jan '21

New submission from Борис Верховский <boris.verk(a)gmail.com>: As far as I can tell, passing `(object,)` and `()` as the `bases` parameter to the 3-argument version of type() produces the same result, because classes inherit from `object` in Python 3: >>> type('X', (object,), dict(a=1)).__bases__ (<class 'object'>,) >>> type('X', (), dict(a=1)).__bases__ (<class 'object'>,) I just want to make sure I'm not missing something and update the documentation of `type()` to reflect that. ---------- assignee: docs@python components: Documentation messages: 366613 nosy: boris, docs@python priority: normal pull_requests: 18902 severity: normal status: open title: Classes created using type() don't need to explicitly inherit from object type: enhancement versions: Python 3.9 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue40304> _______________________________________

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[issue36769] doc Document that fnmatch.filter supports any kind of iterable not just lists
by Andrés Delfino 20 Jan '21

20 Jan '21

New submission from Andrés Delfino <adelfino(a)gmail.com>: Documentation on fnmatch.filter says: Return the subset of the list of names that match pattern. It is the same as [n for n in names if fnmatch(n, pattern)], but implemented more efficiently. But the function actual accepts any kind of iterable. I think it should be documented. ---------- assignee: docs@python components: Documentation messages: 341198 nosy: adelfino, docs@python priority: normal severity: normal status: open title: doc Document that fnmatch.filter supports any kind of iterable not just lists type: enhancement versions: Python 3.7, Python 3.8, Python 3.9 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue36769> _______________________________________

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[issue24711] Document getpass.getpass behavior on ^C
by Markus Unterwaditzer 11 Jan '21

11 Jan '21

New submission from Markus Unterwaditzer: getpass.getpass doesn't enter a newline when the user aborts input with ^C, while input/raw_input does. This behavior is surprising and can lead to mis-formatting of subsequent output. However, since this behavior exists since 2.7 and applications may have started to rely on it, I'd add a note to the documentation. ---------- assignee: docs@python components: Documentation messages: 247302 nosy: docs@python, untitaker priority: normal severity: normal status: open title: Document getpass.getpass behavior on ^C versions: Python 2.7, Python 3.2, Python 3.3, Python 3.4, Python 3.5, Python 3.6 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue24711> _______________________________________

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[issue34804] Repetition of 'for example' in documentation
by Aydin 10 Jan '21

10 Jan '21

New submission from Aydin <bagiyevaydin(a)gmail.com>: In the documentation of Python 3.7.0 there is an error in the usage of the world 'for example'. ---------- assignee: docs@python components: Documentation files: Functional Programming HOWTO — Python 3.7.0 documentation.png messages: 326418 nosy: docs@python, rarblack priority: normal severity: normal status: open title: Repetition of 'for example' in documentation versions: Python 3.7 Added file: https://bugs.python.org/file47825/Functional Programming HOWTO — Python 3.7.0 documentation.png _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue34804> _______________________________________

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[issue38413] Remove or change "Multithreading" section
by Vladimir Ryabtsev 06 Jan '21

06 Jan '21

New submission from Vladimir Ryabtsev <greatvovan(a)gmail.com>: This is regarding the page https://docs.python.org/3.7/library/sqlite3.html. I believe this section on the very bottom of the page has been kept here for pretty long time, during that both SQLite and the sqlite3 module evolved and improved. Now the content contradicts to the description of function "connect()" in the part describing "check_same_thread" parameter. The function description says that using connections from multiple threads is allowed with serialization handled by the user (and it is true), while the bottom "Mutithreading" section says sharing connections is not allowed. I think we can remove "Mutithreading" section entirely unless there is something important to add to what already mentioned. ---------- assignee: docs@python components: Documentation messages: 354227 nosy: Vladimir Ryabtsev, docs@python priority: normal severity: normal status: open title: Remove or change "Multithreading" section versions: Python 3.7, Python 3.8, Python 3.9 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue38413> _______________________________________

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[issue34451] docs: tutorial/introduction doesn't mention toggle of prompts
by Jonathan Fine 05 Jan '21

05 Jan '21

New submission from Jonathan Fine <jfine2358(a)gmail.com>: Interactive code examples need the prompt to be stripped, before copy-and-paste. This is explained in https://docs.python.org/3/tutorial/introduction.html But this page does not tell us about the [>>>] prompt-toggle at top of each interactive code example. This caused a user error, reported in https://mail.python.org/pipermail/python-ideas/2018-August/052869.html. The [>>>] toggle isn't in the Python 2.7 docs, so nothing to fix there! ---------- assignee: docs@python components: Documentation messages: 323839 nosy: docs@python, jfine2358 priority: normal severity: normal status: open title: docs: tutorial/introduction doesn't mention toggle of prompts versions: 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/issue34451> _______________________________________

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[issue41224] Document is_annotated() in the symtable module
by Joannah Nanjekye 31 Dec '20

31 Dec '20

New submission from Joannah Nanjekye <nanjekyejoannah(a)gmail.com>: The function is_annotated() in symtable is not documented. Am using this opportunity to also add docstrings to the methods that didnot have them already. ---------- assignee: docs@python components: Documentation messages: 373200 nosy: docs@python, nanjekyejoannah priority: normal severity: normal status: open title: Document is_annotated() in the symtable module type: enhancement versions: Python 3.10 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue41224> _______________________________________

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