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Title: bpo-29298: Fix crash for required subparsers in argparse by BenSokol · Pull Request #18564 · python/cpython · GitHub

Open Graph Title: bpo-29298: Fix crash for required subparsers in argparse by BenSokol · Pull Request #18564 · python/cpython

X Title: bpo-29298: Fix crash for required subparsers in argparse by BenSokol · Pull Request #18564 · python/cpython

Description: When an instance of subparsers is has required=True, and no subparser is found, an uncaught exception was thrown. OS: Windows - Cygwin Python Version: 3.8.0b4 This issue still appears to be present in master Fixes the following stack trace: ... File "/usr/lib/python3.8/argparse.py", line 1760, in parse_args args, argv = self.parse_known_args(args, namespace) File "/usr/lib/python3.8/argparse.py", line 1792, in parse_known_args namespace, args = self._parse_known_args(args, namespace) File "/usr/lib/python3.8/argparse.py", line 2027, in _parse_known_args ', '.join(required_actions)) TypeError: sequence item 0: expected str instance, NoneType found https://bugs.python.org/issue29298

Open Graph Description: When an instance of subparsers is has required=True, and no subparser is found, an uncaught exception was thrown. OS: Windows - Cygwin Python Version: 3.8.0b4 This issue still appears to be present...

X Description: When an instance of subparsers is has required=True, and no subparser is found, an uncaught exception was thrown. OS: Windows - Cygwin Python Version: 3.8.0b4 This issue still appears to be present...

Opengraph URL: https://github.com/python/cpython/pull/18564

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b64faa6 Fix crash for required subparsers in argparse BenSokol Feb 19, 2020 https://github.com/python/cpython/pull/18564/commits/b64faa692786223010cd0998715bf4116ad9ca83
b5b458b Create 2020-02-20-01-53-01.bpo-29298.laIn2S.rst BenSokol Feb 20, 2020 https://github.com/python/cpython/pull/18564/commits/b5b458b1e727056e17b2d0c2e5c0659417f97f6c
3b4e42b Update Misc/NEWS.d/next/Library/2020-02-20-01-53-01.bpo-29298.laIn2S.rst BenSokol Feb 21, 2020 https://github.com/python/cpython/pull/18564/commits/3b4e42b95ff3ac85632845b4a79dc13fb8018885
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