base64.py

#!/usr/bin/env python

import sys
import math

debug = False # Whether debug output should be printed

def get_input():
    """Parse for user given numbers from arguments,
    if none are found, prompt user for numbers."""
    args = sys.argv[1:]

    if len(args) == 0:
        num = input("> ")
        #print() # A newline after input

    else:
        num = args[0]

    return int(num)

def get_index(chars, char):
    for i in range(0, len(chars)):
        if chars[i] == char: print("'{0}' is number {1}".format(char, i))

def main():
    chars = ["0", "1", "2", "3", "4",
             "5", "6", "7", "8", "9",
             "a", "b", "c", "d", "e",
             "f", "g", "h", "i", "j",
             "k", "l", "m", "n", "o",
             "p", "q", "r", "s", "t",
             "u", "v", "w", "x", "y",
             "z", "A", "B", "C", "D",
             "E", "F", "G", "H", "I",
             "J", "K", "L", "M", "N",
             "O", "P", "Q", "R", "S",
             "T", "U", "V", "W", "X",
             "Y", "Z", "+", "-"]
             # Standard would use '/' in favour of '-',
             # which is not great for unix filepaths.

    bits = len(chars)
    if debug: print("Using {0} bits".format(bits))

    num = get_input()

    #char_amount = math.floor(num / bits) + 1
    #if debug: print("Characters needed: {0}".format(char_amount))

    #print("{0}*64+{1}*1={2}+{3}={4} => {5}{6}".format(math.floor(num / bits), num % bits, math.floor(num / bits) * 64, num % bits, (math.floor(num / bits) * 64) + (num % bits), chars[math.floor(num / bits)], chars[num % bits]))

    for x in range(0, 64):
        for y in range(0, 64):
            for z in range(0, 64):
                if num == 64**2*x+64**1*y+64**0*z: print("64²·{0} + 64¹·{1} + 64⁰·{2} = {3} → {4}{5}{6}".format(x, y, z, num, chars[x], chars[y], chars[z]))

    #get_index(chars, "b")

main()