Python Implementation of Fizzbuzz

fizzbuzz.py

class Genderizer():
    def __init__(self, *args):
        self.genders = {}
        self.add_genders(*args)

    def add_genders(self, *args):
        for i in range(len(args)):
            if i % 2 == 1:
                self.genders[args[i-1]] = args[i]

    def __call__(self, number):
        word = ""
        k = list(self.genders.keys())
        k.sort()
        for i in k:
            if number % i == 0:
                word += self.genders[i]
        if len(word) == 0:
            word = str(number)
        return word

g = Genderizer(3, "Fizz", 5, "Buzz")
g.add_genders(7, "Lizz", 11, "Cuzz", 13, "Gizz")
g.add_genders(17, "Guzz")
for i in range(1, 21):
    print(g(i))