how can I change what a script does while it is running, by pressing a key

[new to python]

I am trying to write code which will let the user press a key like 'b' and run an operation, while a script is still running, and have the script continue afterwards. How can I do this??? I am using Linux.

[Glenton]

In a basic setup, something like

userAnswer=raw_input("Press 'b' or hit enter")
if userAnswer=="b":
    #do whatever
elif userAnswer=="":
    #do something else
else:
    #do the default option

Of course if you want to be a little fancier, you can put the raw_input into a loop and test whether the input is valid before continuing.

If you want to do it like an application, then you need to get into the various GUIs. tkinter is pretty standard.