extensions.py 文件源码

def __init__(self, ca, path_length):
        if not isinstance(ca, bool):
            raise TypeError("ca must be a boolean value")

        if path_length is not None and not ca:
            raise ValueError("path_length must be None when ca is False")

        if (
            path_length is not None and
            (not isinstance(path_length, six.integer_types) or path_length < 0)
        ):
            raise TypeError(
                "path_length must be a non-negative integer or None"
            )

        self._ca = ca
        self._path_length = path_length