paul j3 added the comment:
prefix_chars is a parameter of the parent _ActionsContainer
class _ActionsContainer(object):
def __init__(self,
description,
prefix_chars,
argument_default,
conflict_handler):
paul j3 added the comment:
Use of 'prefix_chars' as a argument_group parameter is not documented, nor
intended.
If it does appear to work in the help formatting, it is probably the result of
inheritance, since both ArgumentParser and Argument_group subclass a
_Actions_Container class.
New submission from Samwyse :
Using the prefix_chars argument to parser.add_argument_group causes usage
information to print correctly, but the resulting parser doesn't recognize the
options. The included program reproduces the issue; it produces the following
output on my system.
---
