Madlib processor

return word with random

from random import randint

def random_verb():
    random_num = randint(0, 1)
    if random_num == 0:
        return "run"
    else:
        return "kayak"

def random_noun():
    random_num = randint(0,1)
    if random_num == 0:
        return "sofa"
    else:
        return "llama"

def process_madlib(string):
    processed = ''
    i = 0
    while i != len(string):
        next_character = string[i]
        if next_character == 'N':
            processed = processed + random_noun()
        if next_character == 'V':
            processed = processed + random_verb()
        else:
            processed = processed + next_character
        i += 1
    return processed

print process_madlib("N it feels good to V a gangster")
print process_madlib('Hello N, do you know how to V?')