Calculating probability of encounter in Python

You can use the following command to calculate the probability of encounter in Python.

import random

codes = set()

def calcu(alphanum_=’1234567890qwertyuiopasdfghjklzxcvbnm’, range_=6):

while 1:

code = ’’.join(random.choice(alphanum_) for x in range(range_))

if code in codes: break

codes.add(code)

return len(codes)

print(calcu())