Python: problem with list

Question

Would anyone know how to explain and correct why the problem occurs in the exit below when I use repeated numbers? Thank you! The return must be presented in the reverse form and without the "0"

    lista = []

n = int(input("Digite um número: "))
while n != 0:
    lista.append(n)
    n = int(input("Digite um número: "))
    if n == 0:
        lista.append(n)

i = 0
while i < len(lista):
    if len(lista) <= 1:
        break
    lista.remove(lista[-1])
    print(lista[-1])

Answer 1

The problem is on this line:

...
lista.remove(lista[-1])
...

It’s because of the fact that remove() remove the first occurrence of the element, i.e., for inputs, "2,2,5,2", obtained:

2
2
2
5

On the first lap you’re apparently eliminating the last element: remove(lista[-1]), which in this case remains remove(2), BUT, this 2 that will be removed will be the first and not the last:

remove(x)

Remove the first item from the list Whose value is x.

Translation

Removes the first item from the list whose value is x.

DOCS

Or whatever will happen to your list along your second loop while is:

[2, 2, 5, 2, 0]
[2, 2, 5, 2]
[2, 5, 2]
[5, 2]
[5]

And the prints of lista[-1] which in this case will be:

2
2
2
5

(do not forget that 0 was deleted before the first print)

If you allow me I will present a suggestion for improvement (to do exactly this) without modifying your code too much:

lista = []
n = int(input("Digite um número: "))
while n != 0:
    lista.append(n)
    n = int(input("Digite um número: "))

while lista: # enquanto houverem elementos na lista, equivalente a while len(lista) > 0
    ele = lista.pop() # retirar o ultimo elemento da lista
    print(ele)

POP DOCS()

Or if you prefer to delete it by index:

lista = []
n = int(input("Digite um número: "))
while n != 0:
    lista.append(n)
    n = int(input("Digite um número: "))

while lista: # enquanto houverem elementos na lista, equivalente a while len(lista) > 0
    ele = lista[-1]
    del lista[len(lista)-1]
    print(ele)

And we can even go further, if the goal is just to print and remove the inputs that are in the list in reverse order we can delete the second while and take the Casts to int:

lista = []
n = input("Digite um número: ")
while n != '0':
    lista.append(n)
    n = input("Digite um número: ")

print('\n'.join(reversed(lista)))
lista.clear()