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bpo-40509: Enable REMAINDER argparse arguments to be used in mutually exclusive … #19919

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bpo-40509: Enable REMAINDER argparse arguments to be used in mutually exclusive … #19919

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6 changes: 5 additions & 1 deletion Lib/argparse.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1516,7 +1516,7 @@ def _get_positional_kwargs(self, dest, **kwargs):

# mark positional arguments as required if at least one is
# always required
if kwargs.get('nargs') not in [OPTIONAL, ZERO_OR_MORE]:
if kwargs.get('nargs') not in [OPTIONAL, ZERO_OR_MORE, REMAINDER]:
kwargs['required'] = True
if kwargs.get('nargs') == ZERO_OR_MORE and 'default' not in kwargs:
kwargs['required'] = True
Expand Down Expand Up @@ -1915,6 +1915,10 @@ def take_action(action, argument_strings, option_string=None):
# error if this argument is not allowed with other previously
# seen arguments, assuming that actions that use the default
# value don't really count as "present"
if action.nargs in [REMAINDER]:
if argument_values == []:
action.default = argument_values

if argument_values is not action.default:
seen_non_default_actions.add(action)
for conflict_action in action_conflicts.get(action, []):
Expand Down
1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2020-05-06-14-31-07.bpo-40509.PgYRgH.rst
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@@ -0,0 +1 @@
Allow REMAINDER positional arguments in argparse mutually exclusive groups.