PYTHON-当代码捕获异常时继续 While 循环

Question

当代码捕获 ZeroDivisionError 或 ValueError 时，While 循环不打印问题。 有 2 个函数称为 main() 和 convert()，我在 main() 中调用了 convert()。 当代码捕获异常 ZeroDivisionError 和 ValueError 以便循环继续时，我想再次打印问题。

这是我的代码：

def main():
    """Print how much gas left in the tank."""
    fuel = input("Fuel remaining: ")
    gas = convert(fuel)
    print(gas)
    
def convert(fraction):
    """Convert fraction into integer and return it."""
    numbers = fraction.split('/')

    X = int(numbers[0])
    Y = int(numbers[1])
    
    # Create a while loop and get the amount of gas left as integer from fraction input.
    while True:       
        try:           
            if X <= Y:
                gas_left = round((X / Y) * 100)                
                return gas_left
            else:
                continue           

        # Handle the errors raised without printing any output.
        except (ValueError, ZeroDivisionError):
            pass 
        
if __name__ == "__main__":
    main()

Output：

Fuel remaining: 1/4
25
Fuel remaining: 3/4
75
Fuel remaining: 4/4
100
Fuel remaining: 4/0 # (ZeroDivisionError)Cursor goes to the next line 
                    # and not printing anything. Instead I want it to 
                    # print 'Fuel remaining: 'again. I want it to 
                    # keep asking 'Fuel remaining: ' until if 
                    # condition is satisfied.
Fuel remaining: three/four # (ValueError) Same issue here, cursor 
                           # goes to the next line and not printing 
                           # anything.

预计 Output：

Fuel remaining: 4/0
Fuel remaining: 

Fuel remaining: three/four
Fuel remaining: 

请帮助我，我做错了什么？

Answer 1

您构建代码的方式将无法满足：

Instead I want it to 
# print 'Fuel remaining: 'again. I want it to 
# keep asking 'Fuel remaining: ' until if 
# condition is satisfied.

您需要将while True移动到主 function，或将整个块/逻辑放入 1 function 或，或，或...

这是重写代码的一种方法：

def main():
    
    convert()
    
def convert():
    """Convert fraction into integer and return it."""
    # Create a while loop and get the amount of gas left as integer from fraction input.
    while True:
        """Print how much gas left in the tank as Empty, Full or a Number based on the user input."""
        fuel = input("Fuel remaining: ")

        numbers = fuel.split('/')

        X = int(numbers[0])
        Y = int(numbers[1])
        try:           
            if X <= Y:
                gas_left = round((X / Y) * 100)                
                print(gas_left)
                return 
            else:
                print("X < Y, try again")
                continue           

        # Handle the errors raised without printing any output.
        except (ValueError, ZeroDivisionError):
            print("Exception occurred")
            pass