CODEWITHSUNDEEP
pythonkeystroke
eddybob123
eddybob123

Reputation: 121

Python don't do anything until keystroke

So basically I need a Python program or a module that only executes the main program once a specific key is pressed, for example the F10 key. All the other modules I found (for example getch) executes once any key it pressed.

Upvotes: 0

Views: 130

Answers (2)

woot
woot

Reputation: 7616

Since you mention msvcrt, I'll assume that (Windows). You'd do it different in Linux.

F10 is a 2-byte return, 00 68, so... you look for the first byte 00, then the second byte 68. There is also a 2-byte return that has a 224 for the first byte, so you'll want to check for that, too.

I included a block on kbhit() because if you let it block on getch() instead, it will pick up a Ctrl-C and you won't be able to break out. Blocking on this gives you that opportunity.

You can make this a little more generic if you'd like, this is hardcoded for F10. 

import msvcrt

while True:
    if msvcrt.kbhit():
        first = ord(msvcrt.getch())     
        if first in (0, 224):
            second = ord(msvcrt.getch())
            if first == 0 and second == 68:
                break

Upvotes: 1

BoppreH
BoppreH

Reputation: 10173

If you are already using getch, you might as well loop over it and wait for your key:

while getch() != 'MAGIC KEY':
    pass

This will forever run getch, until the user presses the key you want. Then the flow continues as normal.

Upvotes: 0

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