import random
text = ['some', 'list', 'of', 'strings', 'really', 'long', 'one', 'at', 'that']
characters = ['♥', '♫']
print(text)
for i in range(0, random.randint(2, 10)):
idx = random.randint(0, len(text))
text = text[:idx] + [random.choice(characters)] + text[idx:]
print(text)
Тестовый вывод:
['some', 'list', 'of', 'strings', 'really', 'long', 'one', 'at', 'that']
['some', 'list', 'of', 'strings', '♫', 'really', 'long', 'one', '♫', 'at', 'that', '♫']