I feel like this shouldn't be allowed

weirdness.py

# weirdness.py
def loop_for(i, li=[]):
    while len(li) <= i:
        print(li)
        li[len(li):len(li)+1] = [len(li)]

loop_for(9)
loop_for(9, ['x', 'y', 'z'])

"""
[]
[0]
[0, 1]
[0, 1, 2]
[0, 1, 2, 3]
[0, 1, 2, 3, 4]
[0, 1, 2, 3, 4, 5]
[0, 1, 2, 3, 4, 5, 6]
[0, 1, 2, 3, 4, 5, 6, 7]
[0, 1, 2, 3, 4, 5, 6, 7, 8]
['x', 'y', 'z']
['x', 'y', 'z', 3]
['x', 'y', 'z', 3, 4]
['x', 'y', 'z', 3, 4, 5]
['x', 'y', 'z', 3, 4, 5, 6]
['x', 'y', 'z', 3, 4, 5, 6, 7]
['x', 'y', 'z', 3, 4, 5, 6, 7, 8]
"""