random_imgur.py

#!/usr/bin/env python
from urllib import urlopen
from random import randint

id_chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

def gen_id():
    id = ""
    for i in range(5):
        id += id_chars[randint(0, len(id_chars)-1)]
    return id

def get_random_imgur():
    found_img = False
    while not found_img:
        id = gen_id()
        resp = urlopen('http://i.imgur.com/%ss.png' % id)
        if resp.getcode() == 200:
            thumbdata = resp.read()
            found_img = len(thumbdata) != 503
    return 'http://i.imgur.com/%s.jpg' % id

for i in range(5):
    print get_random_imgur()