You may use `string.ascii_letters` to use both cases of ascii letters Instead of extending the array two times, simply go with s = [ s1, s2, ] or even

You may use `string.ascii_letters` to use both cases of ascii letters Instead of extending the array two times, simply go with s = [ s1, s2, ] or even simpler s1 + s2 And more idiomatic print (IMO): login = "".join(random.sample(s, 12)) print(f"{login=}")