function_pattern_matching.py 文件源码

def __init__(self, test):
        if not callable(test):
            raise ValueError("Relguard test has to be callable")

        # extract simplified signature
        test_args = _getparams(test)

        # varying args are not allowed, they make no sense in reguards.
        _kinds = {x[1] for x in test_args}
        if (p_kind.POSITIONAL_ONLY in _kinds or
                p_kind.VAR_POSITIONAL in _kinds or
                p_kind.VAR_KEYWORD in _kinds):
            raise ValueError("Relguard test must take only named not varying arguments")

        self.test = test
        self.__argnames__ = {x[0] for x in test_args}