python中set元素为可迭代元素相加

#a 与 b必须是两个相同类型的可迭代对象

a = "1"

b = "2"

print(set(a + b))  # {'1', '2'}

a = "123"

b = "2"

print(set(a + b))  # {'1', '2', '3'}

a = ['1', '3', 2]

b = ['2']

print(set(a + b))  # {'2', '3', 2, '1'}