Message 193072 - Python tracker (original) (raw)

I just filed a patch with http://bugs.python.org/issue10984 (argparse add_mutually_exclusive_group should accept existing arguments to register conflicts) that includes the latest patch from this issue. I tweaked it so _format_actions_usage only returns arg_parts. The block of _re. statements (# clean up separators for mutually exclusive groups) are in a nested function so it can be applied to each of the parts.

In that issue I wrote a custom formatter that handles groups even if they share actions, or the action order does not match definition order. For that it is easier to work with the arg_parts as generated here rather than the whole usage line.