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I thought no one had answered this yet lol! But hey, here's my own go at it:

import random

def random_alphanumeric(limit):
    #ascii alphabet of all alphanumerals
    r = (range(48,58) + range(65,91) + range(97,123))
    random.shuffle(r)
    return reduce(lambda i,s: i + chr(s),r[:random.randint(0,len(r))],"")