function is not defined error in Python

Question

I am trying to define a basic function in python but I always get the following error when I run a simple test program;

>>> pyth_test(1, 2)

Traceba         


        

Answer 1

In python functions aren't accessible magically from everywhere (like they are in say, php). They have to be declared first. So this will work:

def pyth_test (x1, x2):
    print x1 + x2

pyth_test(1, 2)

But this won't:

pyth_test(1, 2)

def pyth_test (x1, x2):
    print x1 + x2