grammar.py 文件源码

def __init__(self, name, mapping):
        if type(mapping) is not dict:  # we really only want dict literals
            raise ValueError()

        if type(name) is not str:
            raise ValueError()

        for key in mapping:
            self._validate_member_(key)
        for value in mapping.values():
            self._validate_member_(value)
        # Read only proxy of mapping, mutation to `mapping` will be reflected
        # but there isn't much we can do about that. Good use of this object
        # would involve a dict literal anyway.
        self.mapping = types.MappingProxyType(mapping)

        super().__init__(name)