Problem between list and tuple

[Larz60+]

tuples are immutable, thus append is not available.
on line 6, you convert the type chiffres from list to tuple use:

chiffres = chiffres[::-1]

>>> chiffres  = [1,3,6,8]
>>> chiffres
[1, 3, 6, 8]
>>> chiffres = chiffres[::-1]
>>> chiffres
[8, 6, 3, 1]
>>>