alphanumeric random code generator len(8)

"""
this algorithm is created by Alejandro Romero @alejo8591 MIT or BSD licensed
"""

from random import randint

class UserCode:

def __init__(self):
    return

def getUserIDNumber(self):
    return self.userIDNumber

def setUserIDNumber(self, userIDNumber):
    try:
        if (type(userIDNumber)==type('str')):self.userIDNumber = str(userIDNumber)
    except:
        raise TypeError, "UserCodes requires a String but was given %s" % type(userIDNumber)
    return self.userIDNumber

def generateCodes(self, userIDNumber):
    i=0, alphabet = ('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'),numeric  =('1','2','3','4','5','5','7','8','9','0'),alphanumeric = (alphabet, numeric)
    codes,position = [], 0
    for i in  range(20):
        j,code=0,''
        for j in range(8):
            option = randint(0,1)
            if option == 0:code += alphanumeric[option][randint(0,25)]
            else:code += alphanumeric[option][randint(0,9)]
        codes.append(code)
    return codes