set

# Author:zhang 
# -*- coding:utf-8 -*- 
'''set set is an unordered, non-repetitive data combination. Its main functions are as follows: 
• Deduplication, turning a list into a set, It is automatically deduplicated. 
• Relationship test, test the intersection, difference, union and other relationships between two sets 
    of data. Only 
''' can be added to the 
set list1 = set([1, 23, 456, 78, 5, ]) 
list2 = set([1, 56423, 23, 58, 456]) 
list3 = set([1, 23]) 
print(list1, "ddd", list2) 
# Intersection: both have de 
# and 
print(list1. intersection(list2)) 
# Union: Unique # in both sets 
or 
print(list1.union(list2)) 
# Difference 
print(list1.difference(list2)) 
print(list2.difference(list1)) 
print( list1 - list2) 
# Parent set 
print(list3.issubset(list1)) 
# Symmetric difference set removes the duplicates in the two sets 
print(list1.symmetric_difference(list2))
print(list1 ^ list2) 
# Intersection 
print(list1 & list2) 
# Union 
print(list1 | list2) 
list1.add(234) 
print(list1) 
len(list1) #Check the length of the set 
list1.pop() #Delete any An element 
list1.remove(23) #Delete an element 
list1.discard(9999) #Delete the element, if the element does not exist, no error will be reported