Generate unique random numbers from different lists

[ichabod801]

You are getting a list out of random.sample, not an integer. Therefore it's not in the list of integers you are checking against, and you get a list of lists rather than a list of integers. Put [0] at the end of line 15 to get the integer out.

Is there some reason you are not just making a list that excludes the outcasts and taking a sample from that?

valid = [x for x in whole_list if x not in outcast_list]
selection_list = random.sample(valid, 5)