# functions go here

def yes_no(question):
    """Checks user response to a question is yes / no (y/n), returns 'yes' or "no" """

    while True:

        response = input(question).lower()

        # check the user says yes/ no / y / n
        if response == "yes" or response == "y":
            return "yes"
        elif response == "no" or response == "n":
            return "no"
        else:
            print("please enter yes / no")


# Display the instructions if the user wants to see them
def instructions():
    """prints instructions"""

    print("""
        *** Instructions ****

       To begin, choose the number of rounds (or press <enter> for infinite mode).

       Then play against the computer. You need to choose R (rock), P (paper), or S (scissors).

       The rules are as follows:
       o    Paper beats rock
       o    Rock beats scissors
       o    Scissors beats paper

       Good Luck!
          """)


# Main routine
print()
print(" Rock / Paper / Scissors Game ")
print()

# ask user if they want to see the instructions
# If they requested
want_instructions = yes_no("Do you want to read the instructions? ")

# checks users enter yes (y) or no (n)
if want_instructions == "yes":
    instructions()

print('program continues')