datastructures.py 文件源码

def __getitem__(self, key, _get_mode=False):
        if not _get_mode:
            if isinstance(key, integer_types):
                return self._list[key]
            elif isinstance(key, slice):
                return self.__class__(self._list[key])
        if not isinstance(key, string_types):
            raise exceptions.BadRequestKeyError(key)
        ikey = key.lower()
        for k, v in self._list:
            if k.lower() == ikey:
                return v
        # micro optimization: if we are in get mode we will catch that
        # exception one stack level down so we can raise a standard
        # key error instead of our special one.
        if _get_mode:
            raise KeyError()
        raise exceptions.BadRequestKeyError(key)