[Tutor] How to use getch()?

[Dick Moores]

I'm trying to figure out how to change what a script does while it is 
running, by pressing a key, such as "k". Can getch() be used for 
this? As a first test:

==================
c = 0
while True:
     c += 1
     if getch() == "k":
         break
print c
===================

This produces "NameError: name 'getch' is not defined".

Am I on the wrong track?

Thanks,

Dick Moores
Win XP, Python 2.43