docs December 2019

docs@python.org

12 participants
378 discussions

[issue38352] In typing docs, note explicit import needed for IO and Pattern/Match

by Karl Kornel

New submission from Karl Kornel <karl(a)kornel.us>: Hello! In https://github.com/python/cpython/blob/master/Lib/typing.py#L115-L117, there is a note about the io and re classes not being included in typing.__all__. I am a relatively new user of typing, and I did `from typing import *` in my code. I ran the code through mypy first, which reported no problems, but then running Python 3.6 failed with a NameError (name 'IO' is not defined). Reading through the typing source, it's clear that this was an intentional decision. So, instead of reporting a bug, I'd like to request a documentation enhancement! The docs for typing make no mention of typing.io or typing.re. So, my request is: In the sections for the IO/TextIO/BinaryIO and Pattern/Match classes, include text warning the user that these types are not imported when you do `from typing import *`. ---------- assignee: docs@python components: Documentation messages: 353763 nosy: Karl Kornel, docs@python priority: normal severity: normal status: open title: In typing docs, note explicit import needed for IO and Pattern/Match type: behavior versions: Python 3.6 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue38352> _______________________________________

1 day, 21 hours

[issue38291] Unclear status of the typing.io and typing.re pseudo-modules in docs and runtime

by dgelessus

New submission from dgelessus <dgelessus+bugs.python.org(a)me.com>: According to bpo-35089 (and the GitHub issues linked there), the typing.io and typing.re modules should no longer be used. Starting with Python 3.6, the typing documentation no longer mentions the typing.io and typing.re modules, and instead documents their contents as part of the main typing module. However, the typing module at runtime still supports typing.io and typing.re as before. Since these modules are not meant to be used anymore and are no longer documented, I would expect at least a DeprecationWarning when using them at runtime. The documentation on this could also be a bit clearer. As long as the modules are still supported at runtime, I would expect the documentation to mention that they still exist, but shouldn't be used anymore. In its current state, the documentation is confusing when coming from Python 3.5 (where typing.io and typing.re were the only documented way to access IO, Pattern, etc., but accessing typing.IO and typing.Pattern directly also works at runtime). ---------- assignee: docs@python components: Documentation, Library (Lib) messages: 353356 nosy: dgelessus, docs@python priority: normal severity: normal status: open title: Unclear status of the typing.io and typing.re pseudo-modules in docs and runtime type: behavior versions: Python 3.6, Python 3.7, Python 3.8, Python 3.9 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue38291> _______________________________________

3 days

[issue32752] no information about accessing typing.Generic type arguments

by Paul Pinterits

New submission from Paul Pinterits <rawing7(a)gmail.com>: The documentation of the typing module explains how to instantiate generic types, but there is no information about how to extract the type arguments from a generic type. Example: >>> list_of_ints = typing.List[int] >>> >>> # how do we get <class 'int'> out of list_of_ints? >>> list_of_ints.??? <class 'int'> Through trial and error I've discovered list_of_ints.__args__, which *seems* to be what I'm looking for, but since it's never mentioned in the docs, it's unclear whether this __args__ attribute is an implementation detail or not. Please document the official/intended way to extract type arguments from a Generic. ---------- assignee: docs@python components: Documentation messages: 311520 nosy: Paul Pinterits, docs@python priority: normal severity: normal status: open title: no information about accessing typing.Generic type arguments type: enhancement versions: Python 3.5, Python 3.6 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue32752> _______________________________________

3 days, 14 hours

[issue22167] iglob() has misleading documentation (does indeed store names internally)

by Roy Smith

New submission from Roy Smith: For background, see: https://mail.python.org/pipermail/python-list/2014-August/676291.html In a nutshell, the iglob() docs say, "Return an iterator which yields the same values as glob() without actually storing them all simultaneously." The problem is, internally, it calls os.listdir(), which apparently *does* store the entire list internally, defeating the whole purpose of iglob() I recognize that iglob() is not going to get fixed in 2.7, but at least the documentation should be updated to point out that it doesn't really do what it says it does. Or rather, it doesn't really not do what it says it doesn't :-) ---------- assignee: docs@python components: Documentation messages: 225048 nosy: docs@python, roysmith priority: normal severity: normal status: open title: iglob() has misleading documentation (does indeed store names internally) type: enhancement versions: Python 2.7 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue22167> _______________________________________

5 days, 11 hours

[issue32824] Docs: Using Python on a Macintosh has bad info per Apple site

by Frank Griswold

New submission from Frank Griswold <py.griswolf(a)spamgourmet.com>: This chunk of docs has bad info in both Python2 and Python3 docs: 4.1.3. Configuration Python on OS X honors all standard Unix environment variables such as PYTHONPATH, but setting these variables for programs started from the Finder is non-standard as the Finder does not read your .profile or .cshrc at startup. You need to create a file ~/.MacOSX/environment.plist. See Apple’s Technical Document QA1067 for details. If you search for QA1067, you are informed that the document is legacy and unsupported, with a suggestion for where to look now. That suggested link leads to a 404. Searching the apple site, I find that at least some thoughtful developers think that configuring the environment isn't even possible, generally; and isn't considered good form even if so. Here: https://forums.developer.apple.com/message/217422 I have no problem setting things for my terminal, as a longtime (unix) user, but for others, this section probably needs a complete examination with an eye toward making it current. quite possibly by reorganizing it. ---------- assignee: docs@python components: Documentation messages: 312023 nosy: docs@python, griswolf priority: normal severity: normal status: open title: Docs: Using Python on a Macintosh has bad info per Apple site type: enhancement _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue32824> _______________________________________

6 days, 21 hours

[issue23750] Clarify difference between os.system/subprocess.call in section "Replacing os.system()"

by Andreas Sommer

New submission from Andreas Sommer: Reading over the section "Replacing os.system()" (https://docs.python.org/2/library/subprocess.html#replacing-os-system), one might assume that the return value of os.system and subprocess.call are equivalent. status = os.system("mycmd" + " myarg") # becomes status = subprocess.call("mycmd" + " myarg", shell=True) However, they are not. Example: import sys import os import subprocess print subprocess.call("false") print os.system("false") gives 1 and 256, respectively. Maybe this could be rephrased for clarity, or a hint added. ---------- assignee: docs@python components: Documentation messages: 239028 nosy: Andreas Sommer, docs@python priority: normal severity: normal status: open title: Clarify difference between os.system/subprocess.call in section "Replacing os.system()" type: enhancement _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue23750> _______________________________________

1 week

[issue24475] The docs never define what a pool "task" is

by Zahari Dim

New submission from Zahari Dim: See: http://stackoverflow.com/questions/30943161/multiprocessing-pool-with-maxta… The documentation never makes clear what a "task" in the context of Pool.map. At best, it says: "This method chops the iterable into a number of chunks which it submits to the process pool as separate tasks. The (approximate) size of these chunks can be specified by setting chunksize to a positive integer." in the map documentation. However it does not say how this chunks are calculated by default, making the maxtasksperchild argument not very useful. The fact that a function evaluated by map is not a "task" should be much clearer in the documentation. Also, in the examples, such as: with multiprocessing.Pool(PROCESSES) as pool: # # Tests # TASKS = [(mul, (i, 7)) for i in range(10)] + \ [(plus, (i, 8)) for i in range(10)] results = [pool.apply_async(calculate, t) for t in TASKS] imap_it = pool.imap(calculatestar, TASKS) imap_unordered_it = pool.imap_unordered(calculatestar, TASKS) TASKS are not actually "tasks" but rather "task groups". ---------- assignee: docs@python components: Documentation messages: 245509 nosy: Zahari.Dim, docs@python priority: normal severity: normal status: open title: The docs never define what a pool "task" is 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/issue24475> _______________________________________

1 week

[issue11975] Fix intersphinx-ing of built-in types (list, int, ...)

by Jonas H.

New submission from Jonas H. <jonas(a)lophus.org>: Intersphinx-ing of int, list, float, ... should work with ":class:`int`" (list, float, ...). Also, intersphinx-ing list methods, e.g. ":meth:`list.insert`", should work. ---------- assignee: docs@python components: Documentation messages: 134923 nosy: docs@python, jonash priority: normal severity: normal status: open title: Fix intersphinx-ing of built-in types (list, int, ...) _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue11975> _______________________________________

1 week

[issue20692] Tutorial section 9.4

by Jon Shemitz

New submission from Jon Shemitz: The tutorial says "Each value is an object, and therefore has a class (also called its type). It is stored as object.__class__." So, I tried >>> 3.__class__ File "<stdin>", line 1 3.__class__ ^ SyntaxError: invalid syntax Yet, "foo".__class__ worked, as did 3j.__class__ and 3.5.__class__. When my son (!) suggested that I try (3).__class__, I did indeed get <type 'int'>, while (3,).__class__ gave <type 'tuple'>. This *looks like* a minor error in the parser, where seeing \d+\. puts it in a state where it expects \d+ and it can't handle \w+ This may be the sort of thing that only a newbie would even think to try, so may not be worth fixing. If so, it may be worth mentioning in the tutorial. ---------- assignee: docs@python components: Documentation, Interpreter Core messages: 211670 nosy: Jon.Shemitz, docs@python priority: normal severity: normal status: open title: Tutorial section 9.4 type: behavior versions: Python 2.7 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue20692> _______________________________________

1 week

[issue26629] Need an ability to build standard DLLs with distutils

by Buraddin Ibn-Karlo

New submission from Buraddin Ibn-Karlo: I want to make a a dynamic library to run its function with ctypes. Also I want to build the library from sources with distutils (the C++ sources are distributed with my Python code). But alas! Our distutils fails, if the library doesn't have initialization function (something like init_<module_name>). Even if the module does not need any initialization. I did a quick and dirty solution: added a dummy function: void init_<module_name>(){} It somehow works, but I don't think that it is a good idea. Cannot you add the possibility to tell distutils, that this extention module is just a simple DLL, that will be used via ctypes (or somehow else) and it does not need any extra init script? Also, cannot you add an extra section to ctypes documentation? With a description how to build such extensions via distutils? ---------- assignee: docs@python components: Build, Documentation, Extension Modules, Windows, ctypes messages: 262308 nosy: Buraddin Ibn-Karlo, docs@python, paul.moore, steve.dower, tim.golden, zach.ware priority: normal severity: normal status: open title: Need an ability to build standard DLLs with distutils type: enhancement versions: Python 2.7 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue26629> _______________________________________

1 week, 1 day

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docs December 2019