docs: def main():
      """for resolving names from command line"""
      parser = argparse.ArgumentParser(description='Python module name to'
                                       'package name')
      group = parser.add_mutually_exclusive_group()
      group.add_argument('--dist', help='distribution style '
                         '(default: %(default)s)',
                         default=platform.linux_distribution()[0])
      group.add_argument('--upstream', help='map to OpenStack project name',
                         action='store_true')
      parser.add_argument('--pyver', help='Python versions to return. "py" is '
                          'the unversioned name',
                          action='append', choices=['py', 'py2', 'py3'],
                          default=[])
      parser.add_argument('modulename', help='python module name')
      args = vars(parser.parse_args())
  
      pyversions = args['pyver'] if args['pyver'] else ['py']
  
      if args['upstream']:
          print(module2upstream(args['modulename']))
      else:
          pylist = module2package(args['modulename'], args['dist'],
                                  py_vers=pyversions)
          # When only 1 version is requested, it will be returned as a string,
          # for backwards compatibility. Else, it will be a list.
          if type(pylist) is list:
              print(' '.join(pylist))
          else:
              print(pylist)