Stop when get input in Python

Question

How can I run a loop in Python and code it to stop when the user press a button (not ctr+c)?

That depends. Do you want this to be a free-running loop, or one that waits for some user input each time through the loop? And, what kind of button input? Mouse button? Keyboard? Power button? — Greg Hewgill, Oct 17 '10 at 23:20
Possible solution: http://stackoverflow.com/questions/3894408/easiest-way-to-pause-a-command-line-python-program/3894439#3894439 . A minor change in the linked code can make the program pause/unpause when a key is pressed. — unutbu, Oct 17 '10 at 23:21
I want a free-running loop. The input can be anyone, or specific. But, is that possible? — FRD, Oct 17 '10 at 23:41

score 0 · Answer 1 · answered Aug 14 '13 at 00:18

I had a similar problem, found this code excerpt that helped me.

#!/usr/bin/env python
import curses

def main(win):
win.nodelay(True) # make getkey() not wait
x = 0
while True:
    #just to show that the loop runs, print a counter
    win.clear()
    win.addstr(0,0,str(x))
    x += 1

    try:
        key = win.getkey()
    except: # in no delay mode getkey raise and exeption if no key is press 
        key = None
    if key == " ": # of we got a space then break
        break

#a wrapper to create a window, and clean up at the end
curses.wrapper(main)

The problem of course is that using curses will prevent a lot of other things (like print) from working but there are ways around that.

Stop when get input in Python

1 Answers1