class set(object):

     """

     set() -> new empty set object

     set(iterable) -> new set object

      

     Build an unordered collection of unique elements.

     """

     def add(self, *args, **kwargs): # real signature unknown

         """

         Add an element to a set，添加元素

          

         This has no effect if the element is already present.

         """

         pass

  

     def clear(self, *args, **kwargs): # real signature unknown

         """ Remove all elements from this set. 清除内容"""

         pass

  

     def copy(self, *args, **kwargs): # real signature unknown

         """ Return a shallow copy of a set. 浅拷贝  """

         pass

  

     def difference(self, *args, **kwargs): # real signature unknown

         """

         Return the difference of two or more sets as a new set. A中存在，B中不存在

          

         (i.e. all elements that are in this set but not the others.)

         """

         pass

  

     def difference_update(self, *args, **kwargs): # real signature unknown

         """ Remove all elements of another set from this set.  从当前集合中删除和B中相同的元素"""

         pass

  

     def discard(self, *args, **kwargs): # real signature unknown

         """

         Remove an element from a set if it is a member.

          

         If the element is not a member, do nothing. 移除指定元素，不存在不保错

         """

         pass

  

     def intersection(self, *args, **kwargs): # real signature unknown

         """

         Return the intersection of two sets as a new set. 交集

          

         (i.e. all elements that are in both sets.)

         """

         pass

  

     def intersection_update(self, *args, **kwargs): # real signature unknown

         """ Update a set with the intersection of itself and another.  取交集并更更新到A中 """

         pass

  

     def isdisjoint(self, *args, **kwargs): # real signature unknown

         """ Return True if two sets have a null intersection.  如果没有交集，返回True，否则返回False"""

         pass

  

     def issubset(self, *args, **kwargs): # real signature unknown

         """ Report whether another set contains this set.  是否是子序列"""

         pass

  

     def issuperset(self, *args, **kwargs): # real signature unknown

         """ Report whether this set contains another set. 是否是父序列"""

         pass

  

     def pop(self, *args, **kwargs): # real signature unknown

         """

         Remove and return an arbitrary set element.

         Raises KeyError if the set is empty. 移除元素

         """

         pass

  

     def remove(self, *args, **kwargs): # real signature unknown

         """

         Remove an element from a set; it must be a member.

          

         If the element is not a member, raise a KeyError. 移除指定元素，不存在保错

         """

         pass

  

     def symmetric_difference(self, *args, **kwargs): # real signature unknown

         """

         Return the symmetric difference of two sets as a new set.  对称差集

          

         (i.e. all elements that are in exactly one of the sets.)

         """

         pass

  

     def symmetric_difference_update(self, *args, **kwargs): # real signature unknown

         """ Update a set with the symmetric difference of itself and another. 对称差集，并更新到a中 """

         pass

  

     def union(self, *args, **kwargs): # real signature unknown

         """

         Return the union of sets as a new set.  并集

          

         (i.e. all elements that are in either set.)

         """

         pass

  

     def update(self, *args, **kwargs): # real signature unknown

         """ Update a set with the union of itself and others. 更新 """

         pass