def __delitem__(self, key):
        """Delete the verse reference line specified by the key."""
        if key not in self:
            raise KeyError('{}[{!r}]'.format(self.__class__.__name__, key))
        del self.__lines[int(key)]
Delete the verse reference line specified by the key.
recipes/Python/577049_Bible_Verse_Quiz__librarypy/recipe-577049.py