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lang-py
SystemExitand replacesys.stderrwith some other object.--foooptional? Can you define a custom action to handle it? These may be cleaner actions than overridingargparse's decision to exit.exit_on_errorparameter toArgumentParser(), but it does not (yet?) throw an error for a missing required option nor an unrecognized option. See bugs.python.org/issue41255.