def fix_default(self, action: Action) -> None:
if hasattr(action, "default") and hasattr(
action, "dest") and action.default != SUPPRESS:
of_type = self.get_type(action)
key = action.dest
outcome = get_env_var(key, of_type=of_type)
if outcome is None and self.file_config:
outcome = self.file_config.get(key, of_type=of_type)
if outcome is not None:
action.default, action.default_source = outcome
# noinspection PyProtectedMember
if isinstance(action, argparse._SubParsersAction):
for values in action.choices.values():
values.fix_defaults()
