#! /usr/bin/env python3

def main( args = None ):
   import argparse

   if args is None:
      import sys
      args = sys.argv

   def _build_parser():
      parser = argparse.ArgumentParser()

      parser.add_argument( "-x", action = "store", nargs = 1 )

      return parser

   parser = _build_parser()

   arguments = parser.parse_args( args )

   print( arguments )
   print( "x = {}".format( arguments.x ) )

if __name__ == "__main__":
   main( "-x 1 -x 2 -x 45".split() )