python基础之set集合

set集合

# 1.set 无序，不重复
# 创建集合的三种方式：
# s1 = {11,22}
# s2 = set() #空集合
# or
# s3 = set([11,22,33,4])
# print(type(set))
# 2.操作集合
# s = set()
# print(s)
# s.add(123)
# print(s)
# s.clear()#清除所有的内容
# print(s)
# s.copy()#浅拷贝
# print(s)
# s1 = {11,22,33}
# s2 = {22,33,44,55}
#差集，从一个集合减去另一个集合
#s3 = s1.difference(s2)
# s3 = s2.difference(s1)
# s3 = s1.symmetric_difference(s2)#对称差集，不同的取出
# print(s3)
# s1.difference_update(s2)#不同更新进s1
# print(s1)

#删
# s1 = {11,22,33,44,55}
# s1.discard(11)#指定移除，不存在不报错
# s1.remove(22)#指定移除，不存在报错
# ret = s1.pop()#随机移除，这样知道随机移除的哪一个
# print(s1)
# print(ret)

# s1 = {11,22,33}
# s2 = {22,33,44,55}
# # print(s1.intersection(s2))#取交集
# # s1.intersection_update(s2)#取出交集并更新给s1
# # print(s1)
# # print(s1.union(s2))#取交集
# li = [11,22,33,44,55,66]
# s1.update(li)#批量添加，更新，可以被for循环的对象
# print(s1)

class set(object):
    """
    set() -> new empty set object
    set(iterable)(元组) -> new set object
    
    Build an unordered collection of unique elements.
    """
    def add(self, *args, **kwargs): # real signature unknown
        """
        Add an element to a set.
        
        This has no effect if the element is already present.
        """
        pass#添加

    def clear(self, *args, **kwargs): # real signature unknown
        """ Remove all elements from this set. """
        pass#清空

    def copy(self, *args, **kwargs): # real signature unknown
        """ Return a shallow copy of a set. """
        pass#复制

    def difference(self, *args, **kwargs): # real signature unknown
        """
        Return the difference of two or more sets as a new set.
        
        (i.e. all elements that are in this set but not the others.)
        """
        pass#取不同的值

    def difference_update(self, *args, **kwargs): # real signature unknown
        """ Remove all elements of another set from this set. """
        pass#不同的进行更新

    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.
        """
        pass

    def intersection(self, *args, **kwargs): # real signature unknown
        """
        Return the intersection of two sets as a new set.
        
        (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. """
        pass

    def isdisjoint(self, *args, **kwargs): # real signature unknown
        """ Return True if two sets have a null intersection. """
        pass

    def issubset(self, *args, **kwargs): # real signature unknown
        """ Report whether another set contains this set. """
        pass

    def issuperset(self, *args, **kwargs): # real signature unknown
        """ Report whether this set contains another set. """
        pass

    def pop(self, *args, **kwargs): # real signature unknown
        """
        Remove and return an arbitrary set element.
        Raises KeyError if the set is empty.
        """
        pass#删除

    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.
        """
        pass#移除

    def symmetric_difference(self, *args, **kwargs): # real signature unknown
        """
        Return the symmetric difference of two sets as a new set.
        
        (i.e. all elements that are in exactly one of the sets.)
        """
        pass#两个集合不同的取出

    def symmetric_difference_update(self, *args, **kwargs): # real signature unknown
        """ Update a set with the symmetric difference of itself and another. """
        pass

    def union(self, *args, **kwargs): # real signature unknown
        """
        Return the union of sets as a new set.
        
        (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. """
        pass#更新，把一个集合有的更新到另一个集合没有的