base55.py

#!/usr/bin/env python
# encoding: utf-8

"""
Base57 Module For Encode and Decode
{A..Z} {a..z} {1..9} without
'O o 0 1 l I'which chars easily mistype
"""

# WARNING DON'T CHANGE the BASE
BASE = '23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghjkmnpqrstuvwxyz'
BASE_LENGTH = len(BASE)

def decode(key=""):
    """@todo: Docstring for encode.

    :key: @todo
    :returns: @todo

    """
    data = 0

    for index, char in enumerate(reversed(key)):
        data += BASE.index(char) * BASE_LENGTH ** index
    return data

def encode(integer):
    """@todo: Docstring for decode.

    :integer: @todo
    :returns: @todo

    """
    if integer == 0:
        return BASE[integer]

    data = ''

    while integer > 0:
        remainder = integer % BASE_LENGTH
        data += BASE[remainder]
        integer /= BASE_LENGTH

    return data[::-1]