「python课程，精心总结」python集合set

s={1,2,2,2,3,4,5,5}

print(s,type(s))#输出{1, 2, 3, 4, 5} <class 'set'>

s1=set(range(6))

print(s1,type(s1))#输出{0, 1, 2, 3, 4, 5} <class 'set'>

s2=set([1,2,2,2,4,5])

print(s2,type(s2))#输出{1, 2, 4, 5} <class 'set'>

s3=set('python')

print(s3,type(s3))#输出{'h', 'n', 'y', 't', 'o', 'p'} <class 'set'>

s4=set()

print(s4,type(s4))#输出set() <class 'set'>

s4.add(33)

print(s4,type(s4))#输出{33} <class 'set'>

s4.update({200,3,3})

print(s4,type(s4))#输出{200, 33, 3} <class 'set'>

s4.update([100,31,32])

print(s4,type(s4))#输出{32, 33, 3, 100, 200, 31} <class 'set'>

s4.remove(100)

print(s4,type(s4))#输出{32, 33, 3, 200, 31} <class 'set'>

'''两个集合是否相等(元素相同就相等)'''

s5={1,2,3,4}

s6={4,2,3,1}

print(s5==s6)#True

print(s5!=s6)#False

'''一个集合是否是另外一个集合的子集'''

s7={10,20,30,40,50,60,70}

s8={10,20,30,40}

s9={10,20,90}

s10={100,200,900}

print(s8.issubset(s7))#True

print(s9.issubset(s7))#False

print(s7.issuperset(s8))#True

print(s7.issuperset(s9))#False

print(s8.isdisjoint(s9))#False,有交集就是false

print(s8.isdisjoint(s10))#True，无交集就是true

print(s8.intersection(s7))#输出{40, 10, 20, 30},求交集操作

print(s8 & s7)#输出{40, 10, 20, 30}

print(s9.union(s10))#输出{20, 90, 900, 100, 200, 10},求并集操作

print(s9 | s10)#输出{20, 90, 900, 100, 200, 10}