如何采用不同的输入类型并对每种类型做不同的事情?蟒蛇 3.5 [英] How to take different input types and do something different with each? Python 3.5

问题描述

所以我正在尝试制作一个供个人使用的 Reddit 机器人，作为一个学习项目，但我在为输入添加错误异常时遇到了问题.

So I am trying to make a Reddit bot for personal use, as a learning project, and I am having trouble adding error exceptions for inputs.

这里是完整的源代码:http://pastebin.com/DYiun1ux

这里唯一有问题的部分是

The parts that are solely in question here are

 while True:
 if type(thing_limit) == int:
     print("That is a number, thanks.")
     break
 elif type(thing_limit) == float:
     print("You need a whole number.")
     sys.exit()
 elif type(thing_limit) == str:
     print("You need a whole number.")
     sys.exit()
 else:
     print("That is a number, thanks.")
     break

我不确定如何确保输入的用户名有效.谢谢！

I'm not sure how I would go about making sure that the username that I put in is valid or not. Thanks!

推荐答案

input 总是返回一个字符串.您最好的选择是尝试将结果转换为整数.

input always returns a string. Your best choice is trying to convert the result to an integer.

try:
    thing_limit = int(thing_limit)
except ValueError:
    print("You need a whole number.")
    sys.exit()
else:
    print("That is a number, thanks.")

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