String concatenate TypeError: can only concatenate str (not "int") to str"; [英] String concatenate TypeError: can only concatenate str (not "int") to str"

问题描述

我正在学习教程，但出现错误.

I am following a tutorial and I am getting an error.

我的代码应该是这样的:

My code should be this:

salaries = {'John':'20','Sally':'30','Sammy':'15'}
print(salaries['John'])

salaries['John'] = salaries['John'] + 30
print(salaries['John'])

我收到这样的错误

回溯(最近一次调用最后一次):文件print.py"，第 9 行，在薪水['约翰'] = 薪水['约翰'] + 30 类型错误:只能将str(不是int")连接到str

Traceback (most recent call last): File "print.py", line 9, in salaries['John'] = salaries['John'] + 30 TypeError: can only concatenate str (not "int") to str

你能帮我解决这个问题吗?

Can you help me with this?

推荐答案

这应该可以解决它:

salaries['John'] = str(int(salaries['John']) + 30)

您需要将 John 的工资转换为 int add 30，然后将其转换回字符串.

You need to convert the salaries of John to an int add 30 and then convert it back to a string.

这会将 salaries['John'] 从 20 更改为 50

This will change salaries['John'] from 20 to 50

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