如何发出错误而不是系统错误[重复]

Question

嘿，我在 python3 中有我的数字猜测器。但是如果用户输入字母而不是数字，我想给出一个错误。当我输入一个字母时，它会说

Traceback (most recent call last):
  File "nummerlol.py", line 14, in <module>
    guess = int(guess)
ValueError: invalid literal for int() with base 10:"

有没有办法改变这个错误？谢谢

import time
import random 
from secrets import randbelow
guesscount = 0
print("Hey whats your name")
name = input()
number = randbelow(20)
print("The Number is between 1 & 20")
while guesscount < 6:
    print("Guess.")
    guess = input()
    guess = int(guess)
    guesscount = guesscount + 1
    if guess < number:
        print("My Number is bigger")
    if guess > number:
        print("My Number is lower")
    if guess == number:
        break
if guess == number :
guesscount = str(guesscount)
print("Nice",name ,".")
print("You needed" ,guesscount ,"Tries")
if guess != number:
    number = str(number)
    print("Bruh,My Number was" ,number)`

Answer 1

您可以使用 try-except 循环。使用continue（如下），用户可以继续猜测。如果您希望脚本以更丰富的信息中断，您也可以将自己的异常替换为 print 和 continue。

import time
import random 
from secrets import randbelow
guesscount = 0
print("Hey whats your name")
name = input()
number = randbelow(20)
print("The Number is between 1 & 20")
while guesscount < 6:
    print("Guess.")
    guess = input()
    try:
        guess = int(guess)
    except:
        print("That is not a number")
        continue
    guesscount = guesscount + 1
    if guess < number:
        print("My Number is bigger")
    if guess > number:
        print("My Number is lower")
    if guess == number:
        break
if guess == number :
    guesscount = str(guesscount)
print("Nice",name ,".")
print("You needed" ,guesscount ,"Tries")
if guess != number:
    number = str(number)
    print("Bruh,My Number was" ,number)

Answer 2

您的similar question 已经存在，但我还是会回答您的问题。

如您所知，您收到回溯响应的原因是您在调用 int(guess) 时尝试将非整数转换为整数。您可以使用 try/except 块捕获此异常。例如，您可以用以下代码替换有问题的代码行：

while True:
  try:
    guess = int(guess)
    break
  except ValueError:
    print("You must enter a valid number.")

此代码将导致程序要求用户输入，直到该输入有效。请查看此 Python3 handling errors and exceptions 文档以获取更多信息。