python - 如何使用带有输入函数的for循环

Question

我只需将三个数字相加并计算平均值

import sys
sums=0.0
k=3
for w in range(k):
    sums = sums + input("Pleas input number " + str(w+1) + " ")
print("the media is " + str(sums/k) + " and the Sum is " + str(sums))

错误:

Pleas input number 1 1
Traceback (most recent call last):
  File "/home/user/Python/sec001.py", line 5, in <module>
    sums = sums + input("Pleas input number " + str(w+1) + " ");
TypeError: unsupported operand type(s) for +: 'float' and 'str'

Answer 1

为什么不先做简单版再优化呢？

def sum_list(l):
    sum = 0
    for x in l:
        sum += x
    return sum

l = list(map(int, input("Enter numbers separated by spaces:  ").split())) 
sum_list(l)

您的问题是您没有将输入从“str”转换为“int”。请记住，Python 会自动初始化数据类型。因此，需要显式强制转换。如果我错了请纠正我，但这就是我的看法。

希望我有帮助:)