python - Joining elements in a list without the join command

Question

I need to join the elements in a list without using the join command, so if for example I have the list:

[12,4,15,11]

The output should be:

1241511

Here is my code so far:

def lists(list1):
    answer = 0
    h = len(list1)
    while list1 != []:
        answer = answer + list1[0] * 10 ** h
        h = h - 1
        list1.pop(0)
    print(answer)

But, in the end, the answer ends up being 125610 which is clearly wrong.

I think the logic is OK, but I can't find the problem?

Answer 1

If you just want to print the number rather than return an actual int:

>>> a = [12,4,15,11]
>>> print(*a, sep='')
1241511