How to replace the "KeyboardInterrupt" command for another key?

user_16482209 0
Viewed 694

I have the following code:

while True:
    try:
        #DoSomething
    except KeyboardInterrupt:
        break

But instead of using Crtl + C, I want to type another key to end the loop. How can I do this?

keyboardinterrupt python-3.x python
2 Answers

You can use the keyboard module:

import keyboard

while True:
    if keyboard.is_pressed("some key"):
        break

    do_something()

This will keep doing something until some key is pressed. Then, it will break out of the endless loop.

To catch hotkeys, use the add_hotkey function:

import keyboard


def handle_keypress(key):
    global running

    running = False
    print(key + " was pressed!")


running = True
keyboard.add_hotkey("ctrl+e", lambda: handle_keypress("Ctrl-E"))

while running:
    do_something()

Or you can use pynput:

from pynput.keyboard import Listener


def on_press(key):
    print('{0} pressed'.format(
        key))


with Listener(
        on_press=on_press) as listener:

    listener.join()
user_154347060

Here's a simple example of using that keyboard module I mentioned in my second comment. It handles most of steps I mentioned in my first comment and works on several platforms. The loop will stop if and when the user presses the Ctrl + B key.

Note that Ctrl + C will still raise a KeyboardInterrupt.

import keyboard
from time import sleep

def callback(keyname):
    global stopped
    print(f'{keyname} was pressed!')
    stopped = True

keyboard.add_hotkey('ctrl+b', lambda: callback('Ctrl-B'))

stopped = False
print('Doing something...')
while not stopped:
    sleep(1)  # Something

print('-fini-')
user_3552300
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