python - 如何解决 + : 'int' and 'tuple' because of trying to return 2 values with lambda? 不受支持的操作数类型

Question

我尝试使用 lambda 返回 2 个值，但最终收到此错误:

TypeError: unsupported operand type(s) for +: 'int' and 'tuple'

这是我收到错误的代码:

def mean(n):
    return sum(n)/len(n) 

dataset = [
    {"name": "John",  "distance": 5602,  "max-speed": 504},
    {"name": "Mike",  "distance": 5242,  "max-speed": 622},
    {"name": "Chad",  "distance": 4825,  "max-speed": 453},
    {"name": "Phil",  "distance": 611,   "max-speed": 500},
    {"name": "Tyler", "distance": 5436,  "max-speed": 909}
]

mean(list(map(lambda x : (x["distance"], x["max-speed"]), dataset)))

如果只是 x["distance"] 或 x["max-speed"]，它将返回我想要的值。我希望输出是

mean of distance

mean of max-speed

提前致谢。

Answer 1

是吗？

def mean(n):
    return (sum([x for x,y in n]) / len(n),
            sum([y for x,y in n]) / len(l))

输出:

(4343.2, 597.6)