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())
Python
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