Variace bez rekurze

gistfile1.py

#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# 04:21 <   RemoteFox~> the fuck 
# 04:22 <   RemoteFox~> jsem ted stravil az nezdrave moc casu snahou napsat bruteforce bez pouziti rekurze
# 04:26 <   RemoteFox~> (resp. program, ktery vypise kombinace)
# 04:26 <   RemoteFox~> ciste jen pomoci nekolika do sebe zanorenych smycek
#
import sys

def err(msg):
    print(msg)
    exit(1)

try:
    max_len = int(sys.argv[1]) + 1
except IndexError as e:
    err("Argument missing!")
except ValueError as e:
    err("Bad argument!")

letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
number = len(letters)

for length in range(1, max_len):
    for j in range(0, number**length):
        index = j
        for i in range(0, length):
            print(letters[index % number], end="")
            index = int(index/number)
        print()