Converts a list index into letter(s)

index_to_letters.py

"""
The code below was used to print the letters of each item on
an ordered list. So index 0 becomes 'a', 1 becomes 'b', and
so on.

It also use multiple letters when the list length is greater
than 26, so index 26 becomes 'aa', index 27 becomes 'ab', 
and so on.

Author: Gutierrez PS
Date: 2019-07-21
"""

import math
print("Hello World")

def index_to_letters(index):
    to_char = lambda i: chr(i % 26 + ord('a'))
    remaining = index
    out_str = ""
    while remaining > 25:
        out_str = to_char(remaining) + out_str
        remaining = math.floor(remaining / 26) - 1
    out_str = to_char(remaining) + out_str
    return out_str
    
for i in range(1,1000):
    print(index_to_letters(i))