TypeError:+不支持的操作数类型:使用str(sum(list))时为'int'和'str' [英] TypeError: unsupported operand type(s) for +: 'int' and 'str' when using str(sum(list))

问题描述

我正在阅读Python教程，不知道为什么我的代码无法正常工作.我知道我需要告诉Python手动打印整数，但是我已经放了 str(sum(ages)).谁能告诉我为什么会这样?

I'm going through the Python tutorial and have no idea why my code isn't working. I know I need to tell Python to print an integer manually but I have already put str(sum(ages)). Can anyone tell me why this is happening?

ages = ['24','34','51','36','57','21','28']

print('The oldest in the group is ' + str(max(ages)) + '.')

print('The youngest in the group is ' + str(min(ages)) + '.')

print('The combined age of all in the list is ' + str(sum(ages)) + '.')

错误:

File "list2.py", line 4, in <module>
    print('The combined age of all in the list is ' + str(sum(ages)) + '.')

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

推荐答案

问题是您不能在字符串列表上使用 sum .为此，您可以使用生成器表达式先将每个元素转换为整数:

The issue is that you can't use sum on a list of strings. In order to do this, you can use a generator expression to convert each element to an integer first:

print('The combined age of all in the list is ' + str(sum(int(x) for x in ages)) + '.')

哪个给了我们

The combined age of all in the list is 251.

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