我如何在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

我正在做我的家庭作业，它需要我使用sum（）和len（）函数来查找输入数字列表的平均值，当我试图使用sum（）来获得列表的总和时，我TypeError：不支持的操作数类型为+：'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

当你从输入中读取时，你有一个字符串列表。

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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