Conversão de bases em Python

base_convert.py

from math import floor


BASE62 = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

def base_convert(src, from_base=10, to_base=16, alphabet=BASE62):
    src = str(src)
    from_alphabet = alphabet[:from_base]
    to_alphabet = alphabet[:to_base]

    # first convert to base 10
    val = 0
    numlen = len(src)
    for i in xrange(numlen):
        val = val * from_base + from_alphabet.find(src[i])
    if val < 0:
        return 0

    # then convert to any base
    r = val % to_base
    res = to_alphabet[r];
    q = floor(val / to_base)
    while q:
        r = q % to_base
        q = floor(q / to_base)
        res = to_alphabet[int(r)] + res;
    
    return res