如何在 Python 中使用 sum() 函数作为列表? [英] How can I use sum() function for a list in Python?

问题描述

我正在做作业，它要求我使用 sum() 和 len() 函数来查找输入数字列表的平均值，当我尝试使用 sum() 来获取列表的总和时，我收到错误类型错误:+ 的不支持的操作数类型:'int' 和 'str'.以下是我的代码:

I am doing my homework and it requirers me to use a sum () and len () functions to find the mean of an input number list, when I tried to use sum () to get the sum of the list, I got an error TypeError: unsupported operand type(s) for +: 'int' and 'str'. Following is my code:

numlist = input("Enter a list of number separated by commas: ")

numlist = numlist.split(",")

s = sum(numlist)
l = len(numlist)
m = float(s/l)
print("mean:",m)

推荐答案

问题是当你从输入中读取时，你有一个字符串列表.你可以做这样的事情作为你的第二行:

The problem is that when you read from the input, you have a list of strings. You could do something like that as your second line:

numlist = [float(x) for x in numlist]

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