Chris Chris - 1 month ago 5x
Python Question

How to kill a while loop with a keystroke?

I am reading serial data and writing to a csv file using a while loop. I want the user to be able to kill the while loop once they feel they have collected enough data.

while True:
#do a bunch of serial stuff

#if the user presses the 'esc' or 'return' key:

I have done something like this using opencv, but it doesn't seem to be working in this application (and i really don't want to import opencv just for this function anyway)...

# Listen for ESC or ENTER key
c = cv.WaitKey(7) % 0x100
if c == 27 or c == 10:

So. How can I let the user break out of the loop?

Also, I don't want to use keyboard interrupt, because the script needs to continue to run after the while loop is terminated.


The easiest way is to just interrupt it with the usual Ctrl-C (SIGINT).

    while True:
except KeyboardInterrupt:

Since Ctrl-C causes KeyboardInterrupt to be raised, just catch it outside the loop and ignore it.