Question

我们正在学习异常处理。我做得对吗？ ValueError是用于捕获键入的字符串而不是数字的正确异常吗？我尝试使用TypeError，但是没有捕获到异常。

还有，在我的四个输入中是否有更有效的方法来捕获每个异常？什么是最佳做法？

#Ask user for ranges. String inputs are not accepted and caught as exceptions. While loop repeats asking user for input until a float number is input.
while True:
    try:
        rangeLower = float(input("Enter your Lower range: "))
    except ValueError:
        print("You must enter a number!")
    else:
        #Break the while-loop
        break
while True:
    try:
        rangeHigher = float(input("Enter your Higher range: "))
    except ValueError:
        print("You must enter a number!")
    else:
        #Break the while-loop
        break
#Ask user for numbers. String inputs are not accepted and caught as exceptions. While loop repeats asking user for input until a float number is input.
while True:
    try:
        num1 = float(input("Enter your First number: "))
    except ValueError:
        print("You must enter a number!")
    else:
        #Break the while-loop
        break
while True:
    try:
        num2 = float(input("Enter your Second number: "))
    except ValueError:
        print("You must enter a number!")
    else:
        #Break the while-loop
        break

Answer 1

在这里，您遇到了称为 WET 的代码两次编写所有内容，我们尝试编写 DRY 代码，即不要重复自己。

在这种情况下，您应该做的是创建一个名为float_input的函数，就像使用try except块并为每个变量赋值调用一样。

def float_input(msg):
    while True:
        try:
            return float(input(msg))
        except ValueError:
            pass


range_lower = float_input('Enter your lower range: ')
...

Try-Except块-是否正确执行此操作？

1 个答案: