Pythonice way to repeat element based on second element in list of lists

Python
#1

As the title stated any list comprehension or enumerate way to do this. Note, this not assignment, juts me trying to improve my coding skills. Thanks

arr_1 = [
  ['boot', 3],
  ['camp', 2],
  ['program', 0]
]
 
ls = []
for sublist in arr_1:
    str_to_rept = sublist[0]
    num_of_time = sublist[1]
    for i in range(num_of_time):
        ls.append(str_to_rept)
print(ls)

Output:
['boot', 'boot', 'boot', 'camp', 'camp']
#2

It’s possible to do it in one line using a nested comprehension:

[w for word, num in arr_1 for w in [word]*num]

But, clear is better than clever so I’d recommend a loop instead (and to have more descriptive names than arr and ls):

words = []
for word, num in word_nums:
    words.extend([word]*num)