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# coding: utf-8
from __future__ import print_function
import argparse
class CheckSingleStoreAction(argparse.Action):
"""issue a warning when the store action is called multiple times"""
def __call__(self, parser, namespace, values, option_string=None):
if getattr(namespace, self.dest, None) is not None:
print(
'WARNING: previous optional argument "' + option_string + " " +
getattr(namespace, self.dest) + '" overwritten by "' +
option_string + " " + values + '"')
setattr(namespace, self.dest, values)
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