python converter 10 to 26

base10to26.py

# -*- coding: utf-8 -*-
'''
copyright: (c) 2015 by fewspider(fewspider@gmail.com).
~~~~~~~~~
converter 10 to 26,like:
1   -> A
2   -> B
27  -> AA
~~~~~~~~~
test it:
python base10to26.py 27
'''
import sys

def base10to26(num):
    converted_string, modstring = '', ''
    currentnum = num
    while currentnum:
        mod = currentnum % 26 
        mod = mod if mod != 0 else 26
        currentnum = (currentnum - mod) // 26
        converted_string = chr(64 + mod) + converted_string
    return converted_string

if __name__ == '__main__':
    num = int(sys.argv[1])
    rs = base10to26(num)
    print 'num-----', num
    print 'result------', rs