如何在Python中将输入限制为仅整数并显示错误消息

我只是尝试得到两个输入，它们都应该是整数，并给出与它们的比较相关的解释。同时，当输入属于其他值时，我想给他们一条错误消息。但是，当我想通过输入字符串输入来测试错误消息时，我会得到这个错误，而不是创建一个循环来再次显示主要问题：

Traceback (most recent call last):
  File "C:\Users\Green\PycharmProjects\pythonProject6\main.py", line 21, in <module>
    comparison()
  File "C:\Users\Green\PycharmProjects\pythonProject6\main.py", line 2, in comparison
    homeSide = int(input("Please enter how many goals did the home side score:"))
ValueError: invalid literal for int() with base 10: 'adasdasdsa'

总之，我怎样才能克服这个问题。提前感谢您的帮助：）

输出：

Please enter how many goals did the home side score:234  
Please enter how many goals did the away side score :asdfasd
Please enter a number!
Please enter how many goals did the away side score :32
Home side got 3 points.

---

除了第一个输入之外，添加try和

相反，将输入添加到循环并将其中断，可以执行类似的操作，这看起来更整洁

def comparison():
    
    homeSide = None
    awaySide = None
    
    while homeSide is None:
        try:
            homeSide = int(input("Please enter how many goals did the home side score:"))
        except ValueError:
            print("Please enter a number")
            
    while awaySide is None:
        try:
            awaySide = int(input('Please enter how many goals did the away side score :'))
        except ValueError:
            print("Please enter a number!")
            

    if homeSide > awaySide:
        print("Home side got 3 points.")

    elif homeSide == awaySide:
        print("Both sides got 1 point.")

    else:
        print("Home side could not get any point.")

comparison()


Please enter how many goals did the home side score:i
Please enter a number
Please enter how many goals did the home side score:90
Please enter how many goals did the away side score :as
Please enter a number!
Please enter how many goals did the away side score :1
Home side got 3 points.

---

这是基本的想法

while True:
    try:
        x = int(input())
        break
    except ValueError:
        print("Error: invalid type!")

---

您还可以使用以下命令验证变量：isInstance（int，variable）

例如：

homeSide = input("Please enter how many goals did the home side score:")

if not isInstance (int, homeSide):
   print(f"{homeside} is not a number. Please enter a number using 1-10")

---

将

homeSide=…

放在try-except中。在请求“客场侧”时，您已经在处理ValueError，因此只需对“主场侧”执行相同操作。相关：当homeSide为None时，最好将其更改为

：

，否则

0

将使您处于循环中。@MikeScotty好球。！固定的。

while True:
    try:
        x = int(input())
        break
    except ValueError:
        print("Error: invalid type!")

homeSide = input("Please enter how many goals did the home side score:")

if not isInstance (int, homeSide):
   print(f"{homeside} is not a number. Please enter a number using 1-10")