尝试除非两个输入相同

Question

我目前有一个 while 循环，如下所示：

while True:
    try:
        entry1 = input("input the first number")
        entry2 = input("enter the second number")
        break
    except ValueError:
        print("number must be valid re-enter")

我想添加代码，如果用户决定输入两个相同的数字，将重新提示用户输入两个不同的数字。我尝试使用以下内容：

while True:
    try:
        entry1 = input("input the first number")
        entry2 = input("enter the second number")
        break
    except ValueError:
        print("number must be valid re-enter")
    try: 
        if entry1 == entry2:
            raise ValueError
        else:
            break
    except ValueError as err:
        print("The two numbers cant be the same. re-enter two unique numbers!"

不幸的是，这不起作用。有谁知道我的代码出了什么问题？

Answer 1

对于您所描述的内容，您不需要所有这些例外情况。例如，您可以只使用比较作为 while 循环的条件：

entry1 = entry2 = 0
while entry1 == entry2:
    entry1 = input("input the first number")
    entry2 = input("enter the second number")
    if entry1 == entry2:
        print("The two numbers can't be the same. re-enter two unique numbers!")

编辑：当然，将输入转换为 int 并在不起作用时捕获错误是有意义的。可能是这样的：

entry1 = entry2 = 0
while entry1 == entry2:
    try:
        entry1 = int(input("input the first number"))
        entry2 = int(input("enter the second number"))
        if entry1 == entry2:
            print("The two numbers can't be the same. re-enter two unique numbers!")
    except ValueError:
        print("Please enter valid numbers")

Answer 2

break 调用不正确。太多 try-except 块。

 while True:
    try:
        entry1 = input("input the first number: ")
        entry2 = input("enter the second number: ")
    except ValueError:
        print("number must be valid re-enter.")

    if entry1 == entry2:
            print("The two numbers cant be the same. re-enter two "
                  "uniquen numbers!")
    else :
        break

Answer 3

您可以使用 assert 方法来确保 2 个输入不同，如果不同，则用 AssertionError 捕获。

while True:
    try:
        entry1 = int(input("input the first number"))
        entry2 = int(input("enter the second number"))
        assert entry1 != entry2
        break
    except ValueError:
        print("number must be valid re-enter")
    except AssertionError:
        print("The two numbers cant be the same. re-enter two unique numbers!")

尝试除非两个输入相同

try except if two inputs are the same

python

input

duplicates

try-catch

except