puthon入门 之集合

list_1 = [1,3,5,7,9]
list_1 = set(list_1)

list_2 = set ([2,4,6,8,10])
print(list_1,list_2)

# 交集
print(list_1.intersection(list_2))

# 并集
print(list_1.union(list_2))

# 差集 in list_1 but not in list_2
print(list_1.difference(list_2))
print(list_2.difference(list_1))

#子集
print(list_1.issubset(list_2))
print(list_1.issuperset(list_2))

# 对称差集
print(list_1.symmetric_difference(list_2))


print("----------------------------------")

# 字符交集
print(list_1 & list_2)

#union 并集
print(list_2 | list_1)

# difference 求差集
print(list_1 - list_2) #in list 1 but not in list2

# 对称差集
print(list_1 ^ list_2)

list_1.add(999)   #添加一项
print(list_1)
list_1.update([888,999,555])  #添加多项
print(list_1)

list_1.remove('999') # 删除一项

list_1.pop('888')  #删除