咨询：PyCharm中Operand Error的成因及代码问题排查

错误原因 #

input()函数默认返回字符串类型，你代码里的age是字符串，而date.today().year是整数类型，整数和字符串无法直接做减法运算，所以运行时触发了TypeError。PyCharm即时反馈没报错是因为静态检查无法预判用户输入的实际类型，只有运行时才会暴露这个问题。

错误代码 #

from datetime import date

name = input("What is your name?")
age = input("How old are you?")
year = date.today().year - age

print("Hello" + name + "!" + "You were born in" + str(year) + ".")

修正后的代码 #

把age用int()转换成整数类型即可：

from datetime import date

name = input("What is your name?")
# 将输入的年龄字符串转为整数
age = int(input("How old are you?"))
year = date.today().year - age

# 用f-string让输出更简洁易读
print(f"Hello {name}! You were born in {year}.")

内容的提问来源于stack exchange，提问作者user25121123