[issue33109] argparse: make new 'required' argument to add_subparsers default to False instead of True
Wolfgang Maier
report at bugs.python.org
Tue Mar 20 09:41:59 EDT 2018
New submission from Wolfgang Maier <wolfgang.maier at biologie.uni-freiburg.de>:
I find the True default for 'required' quite cumbersome introduced as a result of issue 26510.
With existing parsers it can unnecessarily break compatibility between Python3.x versions only to make porting a bit easier for Python2 users.
I think, this late in the life cycle of Python2, within Python3 compatibility should be ranked higher than py2to3 portability.
Command line parsing of a package of mine has long used optional subparsers (without me even thinking much about the fact). Now in 3.7, running
python3.7 -m MyPackage
without arguments (the parser is in __main__.py) I get the ill-formatted error message:
__main__.py: error: the following arguments are required:
while my code in 3.3 - 3.6 was catching the empty Namespace returned and printed a help message.
Because the 'required' keyword argument did not exist in < 3.7 there was no simple way for me to write code that is compatible between all 3.x versions. What I ended up doing now is to check sys.argv before trying to parse things, then print the help message, when that only has a single item, just to keep my existing code working.
OTOH, everything would be just fine with a default value of False.
Also that truncated error message should be fixed before 3.7 gets released.
----------
components: Library (Lib)
messages: 314145
nosy: Anthony Sottile, bethard, eric.araujo, memeplex, paul.j3, wolma
priority: normal
severity: normal
status: open
title: argparse: make new 'required' argument to add_subparsers default to False instead of True
type: behavior
versions: Python 3.7, Python 3.8
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<https://bugs.python.org/issue33109>
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