Use a schema to populate a command line argument parser

def populate_args_level(schema, parser):
    """Use a schema to populate a command line argument parser"""
    for key, value in schema['properties'].iteritems():
        if key == 'name':
            continue

        arg = '--%s' % key
        desc = value['description']

        if 'type' in value:
            if value['type'] == 'string':
                if 'enum' in value:
                    parser.add_argument(arg, help=desc, type=str,
                        choices=value['enum'])
                else:
                    parser.add_argument(arg, help=desc, type=str)
            elif value['type'] == 'number':
                parser.add_argument(arg, help=desc, type=float)
            elif value['type'] == 'integer':
                parser.add_argument(arg, help=desc, type=int)
            elif str(value['type']) == 'array':
                assert value['minItems'] == value['maxItems']

                if value['items']['type'] != 'number':
                    raise NotImplementedError("Only float arrays work")
                parser.add_argument(arg, help=desc, type=float,
                    nargs=value['maxItems'], metavar='N')
            elif value['type'] == 'object':
                #group = parser.add_argument_group(key, value['description'])
                #populate_args_level(value, group)
                pass