Simple responder module, tracks previous responses and excludes them

responder.py

import random

class Responder(object):
	# list of all possible responses 
    responses = [
        "no",
        "yes",
        "one",
        "two",
        "cool"
    ]

    def __init__(self):
		# tracks previous response indexes
        self.prev = [
            -1,
            -1,
            -1
        ]

	# gets a random response from the list
	# excludes the last 3 responses it's generated
    def getresponse(self):
        # generate random answer
        ans = random.randint(0, len(Responder.responses) - 1)

        # make sure it's not been said in the last 3 times
        while (ans in self.prev):
            ans = random.randint(0, len(Responder.responses) - 1)

        #move responses over, add current response
        for i in range(2, 0, -1):
            self.prev[i] = self.prev[i - 1]
        self.prev[0] = ans

        return Responder.responses[ans]


# test module
if __name__ == "__main__":
    r = Responder()
    for i in range(1, 10):
        print(r.getresponse())