Set(集合)

Posted 2022-04-24 jsit-dj-it

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集合：可变的数据类型，他里面的元素必须是不可变的数据类型，无序，不重复。
     
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# set1 = set(1,2,3)
# set2 = 1,2,3,[2,3],‘name‘:‘alex‘  # 错的
# print(set1)
# print(set2)
# set1 = ‘alex‘,‘wusir‘,‘ritian‘,‘egon‘,‘barry‘,
#增
#add
# set1.add(‘女神‘)
# print(set1)
#update
# set1.update(‘abc‘)
# print(set1)
#删除

# set1.pop()  # 随机删除
# print(set1.pop())  # 有返回值
# print(set1)

# set1.remove(‘alex‘)  # 按元素
# print(set1)

# set()
# set1.clear()
# print(set1)  # set()

# del set1
# print(set1)

#查
# for i in set1:
#     print(i)

# set1 = 1,2,3,4,5
# set2 = 4,5,6,7,8
# set3 = set1 & set2
# print(set3)  # 4, 5
# print(set1.intersection(set2))  # 4, 5

# set1 = 1,2,3,4,5
# set2 = 4,5,6,7,8
# print(set1 | set2)  # 1, 2, 3, 4, 5, 6, 7,8
# print(set2.union(set1))  # 1, 2, 3, 4, 5, 6, 7

# set1 = 1,2,3,4,5
# set2 = 4,5,6,7,8
# print(set1 ^ set2)  # 1, 2, 3, 6, 7, 8
# print(set1.symmetric_difference(set2))  # 1, 2, 3, 6, 7, 8

# set1 = 1,2,3,4,5
# set2 = 4,5,6,7,8
# print(set1 - set2)  # 1, 2, 3
# #set1独有的
# print(set1.difference(set2))  # 1, 2, 3

# set1 = 1,2,3,
# set2 = 1,2,3,4,5,6
#
# print(set1 < set2)
# print(set1.issubset(set2))  # 这两个相同，都是说明set1是set2子集。

# print(set2 > set1)
# print(set2.issuperset(set1))  # 这两个相同，都是说明set2是set1超集。


#去重
# li = [1,2,33,33,2,1,4,5,6,6]
# set1 = set(li)
# # print(set1)
# li = list(set1)
# print(li)
# s1 = 1,2,3
# print(s1,type(s1))

# s = frozenset(‘barry‘)
# print(s,type(s))
# for i in s:
#     print(i)