Mailman 3 April 2020 - docs

ImportError: No module named 'pip._vendor.urllib3'
by SuryaChethanReddy ChennamiReddy April 10, 2020

April 10, 2020

i am getting an error when i am using pip to install a library. full error(ex: pip install keras): Traceback (most recent call last): File "c:\program files\python35\lib\runpy.py", line 193, in _run_module_as_main "__main__", mod_spec) File "c:\program files\python35\lib\runpy.py", line 85, in _run_code exec(code, run_globals) File "C:\Program Files\Python35\Scripts\pip.exe\__main__.py", line 4, in <module> File "C:\Users\aks\AppData\Roaming\Python\Python35\site-packages\pip\_internal\__init__.py", line 20, in <module> from pip._vendor.urllib3.exceptions import DependencyWarning ImportError: No module named 'pip._vendor.urllib3' when i try python -m pip install(package name ex:keras): Traceback (most recent call last): File "C:\Program Files\Python35\lib\runpy.py", line 193, in _run_module_as_main "__main__", mod_spec) File "C:\Program Files\Python35\lib\runpy.py", line 85, in _run_code exec(code, run_globals) File "C:\Users\aks\AppData\Roaming\Python\Python35\site-packages\pip\__main__.py", line 16, in <module> from pip._internal import main as _main # isort:skip # noqa File "C:\Users\aks\AppData\Roaming\Python\Python35\site-packages\pip\_internal\__init__.py", line 20, in <module> from pip._vendor.urllib3.exceptions import DependencyWarning ImportError: No module named 'pip._vendor.urllib3' you can reproduce it by upgrading pip, interrupting the install when it is deleting pip. please fix this issue.

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[issue32377] Difference in ressurrection behavior with __del__ in py2 vs. py3
by Eric Cousineau April 9, 2020

April 9, 2020

New submission from Eric Cousineau <eric.cousineau(a)tri.global>: Due to how `PyObject_CallFinalizer` is written in python3, `__del__` will only *ever* be called once. In my use case, I am experimenting with a feature in `pybind11` to prevent slicing with Python class instances that inherit from pybind11-C++ base classes, which involves detecting when an instance loses all reference in Python (`Py_REFCNT(...) == 0`) but still has reference in C++ (`shared_ptr::count() > 0`), and reviving the Python portion when this situation happens. In python2, I could do this without a hitch, as a resurrected object could have its `__del__` method called multiple times (through `tp_dealloc` I believe?). But in python3, the object is marked with `_PyGC_SET_FINALIZED(...)`, thus preventing `__del__` from being called again. It'd be nice to either (a) somehow allow `__del__` to be called naturally without too much fuss or, at the least, (b) have this reflected in the documentation: https://docs.python.org/3/reference/datamodel.html#object.__del__ See attached `revive_test`. Example execution: ``` $ python2 ./revive_test.py Revive Destroy [ Done ] $ python3 ./revive_test.py Revive [ Done ] ``` ---------- assignee: docs@python components: Documentation files: revive_test.py messages: 308660 nosy: Eric Cousineau, docs@python priority: normal severity: normal status: open title: Difference in ressurrection behavior with __del__ in py2 vs. py3 type: behavior versions: Python 3.4, Python 3.5, Python 3.6 Added file: https://bugs.python.org/file47339/revive_test.py _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue32377> _______________________________________

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Module setuptools - Missing function 'find_namespace_packages'
by Gareth April 8, 2020

April 8, 2020

Hi, hope you get this (and it makes sense!): The title says it all, I hope. The setuptools module does not include the above function, as doc'd in: * https://setuptools.readthedocs.io/en/latest/setuptools.html#find-namespace-… * https://packaging.python.org/guides/packaging-namespace-packages/ That's according to >>>dir(setuptools) A very beautifully compact piece of software, eSim <https://github.com/FOSSEE/eSim>, uses it. Luckily, (I think) I was able to rewrite the install.py using find_packages. No complaints from the CLI, anyway. Now, I /was/ going to write something funny (right) & pythony but I've just spent an hour #$%^ing around on the setuptools github bug tracker, trying to set up an account. So I can report a bug. Funnywise, we're both SOL. SUnot, I have 5 'Please verify your email's. Guess that MS buyout really shook the slacker out of those hackers. Cheers

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Python tutorial 3.7
by Kumar Rathinam April 7, 2020

April 7, 2020

Hi Sir, I have got this PDF from online, as attached. I would like to ask you, whether you have any question papers for conducting chapter wise tests? Regards, Kumar Rathinam

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[issue40166] UNICODE HOWTO: Change the total number of code points in the introduction section
by Ama Aje My Fren April 7, 2020

April 7, 2020

New submission from Ama Aje My Fren <amaajemyfren(a)gmail.com>: The dev version of CPython gets the latest version of Unicode integrated to it regularly - and usually within dates of the latest version of Unicode coming out. The Unicode HOWTO documentation has a line in the introduction that refers to the number of Unicode code points assigned so far. This document does not appear to be changed to concur with the number of actual code points supported by CPython or the latest standard by Unicode, Inc (http://www.unicode.org/versions/latest/#Summary). I propose that a change be done to reflect the current number of code points. ---------- assignee: docs@python components: Documentation messages: 365672 nosy: amaajemyfren, docs@python priority: normal severity: normal status: open title: UNICODE HOWTO: Change the total number of code points in the introduction section versions: Python 3.9 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue40166> _______________________________________

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[issue40194] Document special meanings of a single underscore
by cripitone April 5, 2020

April 5, 2020

New submission from cripitone <cri(a)fsfe.org>: The official documentation doesn't seem to cover the various meanings/uses of the single underscore "_", in different contexts (not just the interactive interpreter). See for example: https://www.datacamp.com/community/tutorials/role-underscore-python ---------- assignee: docs@python components: Documentation messages: 365814 nosy: cripitone, docs@python priority: normal severity: normal status: open title: Document special meanings of a single underscore type: enhancement _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue40194> _______________________________________

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[issue40177] Python Language Reference Documentation
by Arnuld April 5, 2020

April 5, 2020

New submission from Arnuld <lispyarnuld(a)gmail.com>: In section "6.10.1 Value comparisons", it is written: https://docs.python.org/3/reference/expressions.html "The not-a-number values float('NaN') and decimal.Decimal('NaN') are special. Any ordered comparison of a number to a not-a-number value is false. A counter-intuitive implication is that not-a-number values are not equal to themselves. For example, if x = float('NaN'), 3 < x, x < 3, x == x, x != x are all false. This behavior is compliant with IEEE 754." Last comparison "x != x" does not return False, it returns True. Here is the output from my iPython interpeter I am using on Arch Linux (latest as of today): In [86]: x == y Out[86]: False In [87]: x != y Out[87]: True I verified the bug it on Wikipedia too: https://en.wikipedia.org/wiki/NaN#Comparison_with_NaN ---------- assignee: docs@python components: Documentation files: Screenshot_2020-04-04 6 Expressions — Python 3 8 2 documentation.png messages: 365742 nosy: ArnuldOnData, docs@python priority: normal severity: normal status: open title: Python Language Reference Documentation type: enhancement versions: Python 3.7, Python 3.8, Python 3.9 Added file: https://bugs.python.org/file49033/Screenshot_2020-04-04 6 Expressions — Python 3 8 2 documentation.png _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue40177> _______________________________________

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[issue40191] tempfile.mkstemp() | Documentation Error
by Howard Waterfall April 5, 2020

April 5, 2020

New submission from Howard Waterfall <hwaterfall(a)gmail.com>: The documentation for tempfile.mkstemp() says: returns a tuple containing an OS-level handle to an open file (as would be returned by os.open()) and the absolute pathname of that file, in that order. I don't believe this is correct. It should say: returns a tuple containing an OS-level file descriptor and the absolute pathname of that file, in that order. I say this because this works: file_descriptor, uri = tempfile.mkstemp() open_file = os.fdopen(file_descriptor, 'w') open_file.write("hello world") print(uri) but this raises an error: open_file, uri = tempfile.mkstemp() open_file.write("hello world") print(uri) Traceback (most recent call last): File "test.py", line 78, in <module> main() File "test.py", line 74, in main open_file.write("hello world") AttributeError: 'int' object has no attribute 'write' ---------- assignee: docs@python components: Documentation messages: 365805 nosy: Howard Waterfall, docs@python priority: normal severity: normal status: open title: tempfile.mkstemp() | Documentation Error type: behavior versions: Python 3.8 _______________________________________ Python tracker <report(a)bugs.python.org> <https://bugs.python.org/issue40191> _______________________________________

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Itertools Bug
by Jack Nelson April 4, 2020

April 4, 2020

Hi, See below bug in zip_longest from itertools: -------------- from itertools import zip_longest a = ('a', 'b', 'c') b = (1, 2, 3, 4, 5) c = dict(zip_longest(a, b, fillvalue='Foo')) print(c) Expected: {'a': 1, 'b': 2, 'c': 3, ‘Foo’: 4, 'Foo': 5} Actual: {'a': 1, 'b': 2, 'c': 3, 'Foo': 5} —————— Seen when using Python 3.8.1 Best regards, Jack Nelson

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Out of date/ missing information in the Python on Windows FAQ
by Adam Kalisz April 4, 2020

April 4, 2020

Dear Pythonistas, in the section on making an executable from a Python script [0], there seems to be an old information about py2exe that it doesn't support Python 3 but py2exe.org links to pypi.org, where it says the package supports Python 3.3+ [1]. I am also really missing some information whether the PSF endorses installation via Chocolatey or other package managers [2], [3], since this seems to be a great way to install Python with basically one simple command line (or two, if you count installing Chocolatey as well). Maybe this could also be mentioned in the FAQ. Overall, maybe a hint at Chocolatey or other similar Package managers, such as Scoop [4] or maybe even the Windows Store [5], should be added to the Python Releases for Windows page [6]. Certainly, the discoverability and installation of Python on Windows is a hurdle for the less experienced or people just getting started during the current crisis. [0] https://docs.python.org/3/faq/windows.html#how-do-i-make-an-executable-from… [1] https://pypi.org/project/py2exe/ [2] https://chocolatey.org/packages/python3/ [3] https://chocolatey.org/packages/python3/3.8.2 [4] https://scoop.sh/ [5] https://www.microsoft.com/en-us/p/python-38/9mssztt1n39l [6] https://www.python.org/downloads/windows/ Thank you for your work. Adam Kalisz

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