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from argparse import ArgumentParser, RawDescriptionHelpFormatter
import sys
class HelpfulArgumentParser(ArgumentParser):
"""An ArgumentParser that prints full help on errors."""
def __init__(self, *args, **kwargs):
if 'formatter_class' not in kwargs:
kwargs['formatter_class'] = RawDescriptionHelpFormatter
super().__init__(*args, **kwargs)
def error(self, message):
self.print_help(sys.stderr)
args = {'prog': self.prog, 'message': message}
self.exit(2, '%(prog)s: error: %(message)s\n' % args)
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