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)
for resolving names from command line