One-passage list shuffler (generator)

#! /usr/bin/env python3

""" One-passage list randomizer: based on a generator """

import random as r

class Shufflable:
    """ Shufflable objects """
    def __init__(self, lst=None):
        self.lst = lst
        self.output = list()
        self.lst_len = len(self.lst)
        self.indices_list = list(range(self.lst_len))

    def yield_unique_random(self):
        """ Return unique random numbers """
        for i in range(self.lst_len - 1, -1, -1):
            yield self.indices_list.pop(r.randint(0, i))

    def shuffle(self):
        """ Shuffle the list """
        if self.lst:
            for i in self.yield_unique_random():
                self.output.append(self.lst[i])
        self.lst = self.output
        return self.lst

NUMBERS = Shufflable(list(range(16)))
print(NUMBERS.shuffle())

WORDS = Shufflable(["foo", "bar", "baz", "ham", "spam", "eggs"])
print(WORDS.shuffle())

# [10, 14, 3, 1, 11, 8, 0, 7, 5, 13, 4, 9, 12, 6, 15, 2]
# ['bar', 'eggs', 'ham', 'foo', 'spam', 'baz']