python学习笔记之集合

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。
     {}
'''
# 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)