Related Modules and Documentation : Introduction « Class « Python Tutorial

1. Python Tutorial
2. Class
3. Introduction

def foo(data):
    if isinstance(data, int):
        print 'you entered an integer'
    elif isinstance(data, str):
        print 'you entered a string'
    else:
        raise TypeError, 'only integers or strings!'

from operator  import *   
vec1 = [12, 24]
vec2 = [2, 3, 4]
opvec = (add, sub, mul, div)  
for eachOp  in opvec:         
    for i  in vec1:
       for j  in vec2:
           print '%s(%d, %d) = %d' % (eachOp.__name__, i, j, eachOp(i, j))