集合就是一堆数据放在一起的理解。直接用例子来记住:
list_1 = [1,4,5,7,3,6,7,9]
list_1 = set(list_1)
list_2 =set([2,6,0,66,22,8,4])
print(list_1,list_2)
”’
print(list_1.intersection(list_2) )
print(list_1.union(list_2))
print(list_1.difference(list_2)) # 取list_1 里面有的list_2里面没有的
print(list_2.difference(list_1))
list_3 = set([1,3,7])
print(list_3.issubset(list_1)) #输出True
print(list_1.issuperset(list_3))#输出True
print(list_1.symmetric_difference(list_2))
print(“————-“)
list_4 = set([5,6,7,8]) # 有交集返回True 没有交集返回False
print(list_3.isdisjoint(list_4)) # Return True if two sets have a null intersection.
”’
print(list_1 & list_2)
print(list_2 | list_1)
print(list_1 - list_2) # in list 1 but not in list 2
print(list_1 ^ list_2)
list_1.add(999)
list_1.update([888,777,555])
print(list_1)
print(list_1.pop()) #随机删除
print(list_1.remove(999)) # remove指定删除元素必须存在,否则会报错
print( list_1.discard(888) ) # 删除就算没有也不会报错
–老男孩视频参考。