How to break the loop in the main function, using keypress [duplicate]

Question

how to break loop with keypress ("Y"):

I want to stop function by pressing key "Y", not CTRL+C.

Here's my code:

def main():
    while True:
        try:
            num = int(input("Enter a number: "))
            if (num % 2) == 0:
                print("Even number")
            elif (num % 2) != 0:
                print("Odd number")
        except (ValueError, Exception):
            print("Inappropriate number")


if __name__ == "__main__":
    main()

Andrei Stoica · Accepted Answer · 2022-04-17 19:24:39Z

0

You can read the input in a variable, check if it's Y and then convert it to an int

def main():
    while True:
        try:
            val = input("Enter a number: ")
            if val == 'Y':
              break

            num = int(val)
            if (num % 2) == 0:
                print("Even number")
            elif (num % 2) != 0:
                print("Odd number")
        except (ValueError, Exception):
            print("Inappropriate number")


if __name__ == "__main__":
    main()

answered Apr 17, 2022 at 19:24

Andrei Stoica

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2 Comments

jopp Over a year ago

One could also use a signal handler for this purpose, namely a user-defined signal like SIGUSR1, where you would set a variable in the handler and check it later in the while loop.

DYZ Over a year ago

@kali Signals have nothing to do with this problem.

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