############################################################
#
# Ask the Question.
#     Get the answer.
#     Make response Upper Case
#     If Yes    ..... rejoice and finish!
#     If No     ..... weep and finish!
#     Otherwise ..... Error and TRY AGAIN!!!!!!
#         
# Data Structures
# ===============
#
# Many ways to say Yes ... Maybe a tuple of all?
#                          To test response against
#                          All elements Upper Case
# Many ways to say No  ... Maybe a tuple of all?
#                          To test response against
#                          All elements Upper Case
############################################################

Yes = ('Y', 'YES', 'OK')    # All allowed Yes answers
No  = ('N', 'NO', 'NEVER' ) # All allowed No  answers

while True:
    Response = input("Do you understand Loops yet???  ").upper()

    if   Response in Yes:
        print("Jolly Good!")
        break
    elif Response in No:
        print("Well, Try harder!")
        break
    else:
        print("Answer must be Yes or No!")