set 集合

Posted 2020-09-25 Mr.Zuo

set 是一个无序且不重复的元素集合

访问速度快

解决了重复问题

 1     def add(self, *args, **kwargs): # real signature unknown 添加
 2         """
 3         Add an element to a set.
 4         
 5         This has no effect if the element is already present.
 6         """
 7         pass

例：
s1 = set()
s1.add(‘xiaolong‘)
print(s1)

s1.add(‘xiaolong‘)
print(s1)

得：

　　　{‘xiaolong‘}
　　　{‘xiaolong‘}

 8 
 9     def clear(self, *args, **kwargs): # real signature unknown清空所有数据
10         """ Remove all elements from this set. """
11         pass


12 
13     def copy(self, *args, **kwargs): # real signature unknown浅拷贝
14         """ Return a shallow copy of a set. """
15         pass


16 
17     def difference(self, *args, **kwargs): # real signature unknown比对两个set之间的不同、得到一个新set
18         """
19         Return the difference of two or more sets as a new set.
20         
21         (i.e. all elements that are in this set but not the others.)
22         """
23         pass

例:
s2 = set([‘alex‘, ‘eric‘, ‘tony‘,‘alex‘])
print(s2)
s3 = s2.difference([‘alex‘, ‘eric‘])
print(s2)
print(s3)
得：

{‘tony‘, ‘alex‘, ‘eric‘}
{‘tony‘, ‘alex‘, ‘eric‘}
{‘tony‘}

24 
25     def difference_update(self, *args, **kwargs): # real signature unknown更新本身数据集合、把传进来的数据和本身一样的删掉，没有返回值（删除当前set中的所有包含在 参数集合 里的元素）
26         """ Remove all elements of another set from this set. """
27         pass

例：
s2 = set([‘alex‘, ‘eric‘, ‘tony‘,‘alex‘])
print(s2)
s4 = s2.difference_update([‘alex‘, ‘eric‘])#更新了自己、把以前的和传进来的相同的移除
print(s2)
print(s4)
得：

{‘alex‘, ‘tony‘, ‘eric‘}
{‘tony‘}
None

28 
29     def discard(self, *args, **kwargs): # real signature unknown移除元素
30         """
31         Remove an element from a set if it is a member.
32         
33         If the element is not a member, do nothing.
34         """
35         pass


36 
37     def intersection(self, *args, **kwargs): # real signature unknown取交集，创建一个新的set
38         """
39         Return the intersection of two sets as a new set.
40         
41         (i.e. all elements that are in both sets.)
42         """
43         pass
44 

45     def intersection_update(self, *args, **kwargs): # real signature unknown取交集、修改原来的set
46         """ Update a set with the intersection of itself and another. """
47         pass


48 
49     def isdisjoint(self, *args, **kwargs): # real signature unknown如果没有交集、返回true
50         """ Return True if two sets have a null intersection. """
51         pass


52 
53     def issubset(self, *args, **kwargs): # real signature unknown是否是子集
54         """ Report whether another set contains this set. """
55         pass


56 
57     def issuperset(self, *args, **kwargs): # real signature unknown是否是父集
58         """ Report whether this set contains another set. """
59         pass


60 
61     def pop(self, *args, **kwargs): # real signature unknown移除
62         """
63         Remove and return an arbitrary set element.
64         Raises KeyError if the set is empty.
65         """
66         pass
67 
68     def remove(self, *args, **kwargs): # real signature unknown移除
69         """
70         Remove an element from a set; it must be a member.
71         
72         If the element is not a member, raise a KeyError.
73         """
74         pass

例：
s2 = set([‘alex‘, ‘eric‘, ‘tony‘,‘alex‘])
print(s2)
s2.remove(‘alex‘)
print(s2)
得：

{‘eric‘, ‘tony‘, ‘alex‘}
{‘eric‘, ‘tony‘}

 

75 
76     def symmetric_difference(self, *args, **kwargs): # real signature unknown差集、创建新对象
77         """
78         Return the symmetric difference of two sets as a new set.
79         
80         (i.e. all elements that are in exactly one of the sets.)
81         """
82         pass


83 
84     def symmetric_difference_update(self, *args, **kwargs): # real signature unknown差集、改变原来
85         """ Update a set with the symmetric difference of itself and another. """
86         pass
87 

88     def union(self, *args, **kwargs): # real signature unknown并集
89         """
90         Return the union of sets as a new set.
91         
92         (i.e. all elements that are in either set.)
93         """
94         pass
95 
96     def update(self, *args, **kwargs): # real signature unknown更新
97         """ Update a set with the union of itself and others. """
98         pass