回溯（最近一次调用最后一次）Python 错误

Question

错误

Traceback (most recent call last):
  File "C:\Users\Alex\Python\Lesson01.py", line 5, in <module>
    print("In 10 years you will be ", a+b, "years old")
TypeError: can only concatenate str (not "int") to str

目前我正在学习 Python 3 并遇到此错误。这是什么意思？我也试过 + 而不是逗号，这也不起作用：/

代码如下：

user_input = input("How old are you?\n-> ")

a = user_input
b = 10
print("In 10 years you will be ", a+b, "years old")

Answer 1

你必须打印这个：

user_input = int(input("How old are you?\n-> "))

a = user_input
b = 10
print("In 10 years you will be " + str(a+b) + " years old")

这应该可以正常工作