datastructures.py 文件源码

def quality(self, key):
        """Returns the quality of the key.

        .. versionadded:: 0.6
           In previous versions you had to use the item-lookup syntax
           (eg: ``obj[key]`` instead of ``obj.quality(key)``)
        """
        for item, quality in self:
            if self._value_matches(key, item):
                return quality
        return 0