Exercise 5: UserIDs.py

1) A registration website needs to verify user IDs to ensure duplicates are not used.

a) Make a list of seven existing user IDs called current_ids.

b) Make another list of seven user IDs called new_ids.

c) Make sure one or two of the new IDs are also in the current_ids list.

d) Loop through the new_ids list to see if each new ID has already been used. If it has, print a message that the person will need to enter a new ID.

e) If an ID has not been used, print a message saying that the ID is available.

f) Make sure your comparison is case insensitive. If 'Mike' has been used, 'MIKE' should not be accepted