datastructures.py 文件源码

def __getitem__(self, key):
        """Besides index lookup (getting item n) you can also pass it a string
        to get the quality for the item.  If the item is not in the list, the
        returned quality is ``0``.
        """
        if isinstance(key, string_types):
            return self.quality(key)
        return list.__getitem__(self, key)