python 3.x - Reverse a string using while(),pop() and insert

Question

using

while
.pop()
insert()

pop() the first item in the list and add to the beginning of a new string that will be reversed

# [ ] Challenge: write the code for "reverse a string" reversing some_numbers

some_numbers =[1,2,3,4,5,6,7,8,9,11,22,33,44,55,66,77]

rev_string = []

while len(some_numbers):
    rev = some_numbers.pop()
    rev_string.insert(0,rev)
print(rev)

print(some_numbers)
print(rev_string)

My first question is that:

1. As i am printing rev in line 7, i am getting 1 as the answer but we know that an empty pop is used to denote the last element then why i am getting 1 instead of 77.
2. I am getting the right answer by putting 0 inside the pop in line 5. How ?

Answer 1

Your assumption pop() the first item in the list is wrong. When you call some_numbers.pop, you get the last element of the list popped, check the docs. This should answer both of your questions.