def _extract_yx(args):
    if len(args) is 2:
        return (args[0], args[1], args[2:])
    return (None, None, args)
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/cffi-1.5.2/demo/_curses.py/_extract_yx/operator `>=` -> `is`