One-passage list shuffler

#! /usr/bin/env python3

"""One-passage list shuffler"""

import random as r

class Shufflable:
    """Shufflable lists"""
    def __init__(self, lst=None):
        self.lst = lst

    def swap(self, from_index, to_index):
        """Swapping values"""
        temp = self.lst[from_index]
        self.lst[from_index] = self.lst[to_index]
        self.lst[to_index] = temp

    def shuffle(self):
        """Shuffling items"""
        if self.lst:
            for i in range(len(self.lst)):
                target_index = r.randint(0, i)
                self.swap(i, target_index)
        return self.lst

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

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

print(NUMBERS.lst, '\n', WORDS.lst, sep='')

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