5.20 集合

集合的使用

# Author: wang  cheng   hua

list_1 = [1,3,5,7,8,4,5,8,9]

list_1 = set(list_1)

list_2 = [4,6,8,9,22,33]

list_2 = set(list_2)

list_3 =[3,5,7]

list_3 = set(list_3)


print (list_1,list_2)

# 交集

print(list_1.intersection(list_2))

#并集

print (list_1.union(list_2))

#差集   is in list_1 not in list_2

print(list_1.difference(list_2))

print(list_2.difference(list_1))

#子集

print(list_1.issubset(list_3))

print(list_3.issubset(list_1))

print(list_3.issuperset(list_1))

#对称差集

print(list_1.symmetric_difference(list_2))

print('-------')

list_4 = set([11,12,13])

print(list_3.isdisjoint(list_4))

#运算

#交集

print(list_1 & list_2)

#并集

print(list_1 | list_2)

#差集

print(list_1-list_2) # in list_1 but not in list_2

#对称差集

print(list_3 ^ list_4)

#基本操作

list_1.add(10)

print(list_1)

list_1.update([66,55,77])

print(list_1)

print(len(list_1))

print(list_1.pop())

print(list_1.pop())

print(list_1.discard(100))