How does python work?

[hamorabi]

I recently upgraded my Prime to the latest firmware and I'm trying to understand how to write python functions/scripts. I didn't seem to find much a solution while perusing older threads.

Let's say my script looks like this:

PHP Code:

def func1(a, b):
    return a + b

def func2(a, b):
    return a - b

def func3(a, b, c):
    if c == 0:
        return func1(a, b)
    else:
        return func2(a, b) 


I know this is a contrived example, but I just want to know how to make it work. The question is, how do I call func3 ?