2716 

  2716 

  2717     def __and__(self, other):

  2717     def __and__(self, other):

  2718         """Returns a new object with the intersection of the two collections.

  2718         """Returns a new object with the intersection of the two collections.

  2719 

  2719 

  2720         This is part of the mandatory API for smartset."""

  2720         This is part of the mandatory API for smartset."""

  2721         return self.filter(other.__contains__, cache=False)

  2723         return self.filter(other.__contains__, cache=False)

  2722 

  2724 

  2723     def __add__(self, other):

  2725     def __add__(self, other):

  2724         """Returns a new object with the union of the two collections.

  2726         """Returns a new object with the union of the two collections.

  2725 

  2727