New submission from Michael Cohen:
Argparse has an option to set the custom help formatter class as a kwarg. For
example one can define:
class MyHelpFormatter(argparse.RawDescriptionHelpFormatter):
def add_argument(self, action):
if action.dest != "SUPPRESS":
super(RekallHelpFormatter, self).add_argument(action)
parser = ArguementParser(
formatter_class=MyHelpFormatter)
But when one creates a subparser there is no way to define the formatter class
for it - i.e. parser.add_subparsers() does not accept a formatter_class
parameter. Instead we see this code:
def add_subparsers(self, **kwargs):
...
# add the parser class to the arguments if it's not present
kwargs.setdefault('parser_class', type(self))
The only way to make this work is to extend ArguementParser to force it to use
the formatter_class through inheritance:
class MyArgParser(argparse.ArgumentParser):
def __init__(self, **kwargs):
kwargs["formatter_class"] = MyHelpFormatter
super(MyArgParser, self).__init__(**kwargs)
this is counter intuitive since formatter_class can be passed to the
constructor but then it is not propagated to subparsers.
IMHO the expect action here is to have the formatter_class automatically
propagates to subparsers as well. Short of that we need to be able to specific
it in add_subparser() call.
----------
components: Extension Modules
messages: 219534
nosy: Michael.Cohen
priority: normal
severity: normal
status: open
title: Argparse does not propagate HelpFormatter class to subparsers
type: behavior
versions: Python 2.7
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21633>
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