python 集合set
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# -*- coding: utf-8 -*-
#无序不重复
set1 = {}
str = 'dsfhadfhhjdsfewhiufewhfewf'
set2 ={1,2,3,4,5,6,7,89,9,9,9,9}
print(set2) #set()
set3 = set(str)
print(set3) #set(['a', 'e', 'd', 'f', 'i', 'h', 'j', 's', 'u', 'w'])
print('a' in set3)#True
print(len(set3))#10
set3.add('hello')
print(set3) #set(['a', 'e', 'd', 'f', 'i', 'h', 'j', 's', 'u', 'w', 'hello'])
set3.remove('a')
print(set3) #set(['e', 'd', 'f', 'i', 'h', 'j', 's', 'u', 'w', 'hello'])
#不可变集合
set4 = frozenset(str)
#set4.add(0) #AttributeError: 'frozenset' object has no attribute 'add'
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