Doc/lib/required_1.py

   1 import optparse
   2
   3 class OptionParser (optparse.OptionParser):
   4
   5     def check_required (self, opt):
   6         option = self.get_option(opt)
   7
   8         # Assumes the option's 'default' is set to None!
   9         if getattr(self.values, option.dest) is None:
  10             self.error("%s option not supplied" % option)
  11
  12
  13 parser = OptionParser()
  14 parser.add_option("-v", action="count", dest="verbose")
  15 parser.add_option("-f", "--file", default=None)
  16 (options, args) = parser.parse_args()
  17
  18 print "verbose:", options.verbose
  19 print "file:", options.file
  20 parser.check_required("-f")