# checks users enter yes (y) or no (n)
# Check that users have entered a valid
# option based on a list
def string_checker(question, valid_ans=("yes", "no")):
    error = f"Please enter a valid option from the following list: {valid_ans}"

    while True:

        # get user response and make sure it's lowercase
        user_response = input(question).lower()

        for item in valid_ans:
            # check if the user response is a word in the list
            if item == user_response:
                return item

            # check if the user response is the same as
            # the first letter of an item in the list
            elif user_response == item[0]:
                return item

        # print error if user does not enter something that is valid
        print(error)
        print()

# displays the instructions
def instruction():
    print('\n'
          '**** Instructions ****\n'
          '\n'
          'To begin, choose the number of rounds (or infinite rounds)\n'
          ' \n'
          'Hand Gestures:\n'
          '\n'
          'Rock: is R\n'
          'Paper: is P\n'
          'Scissors: is S\n'
          '\n'
          'Rules:\n'
          '\n'
          'Rock beats Scissors (rock crushes scissors)\n'
          'Scissors beats Paper (scissors cuts paper)\n'
          'Paper beats Rock (paper covers rock)\n'
          '\n'
          'Rock vs. Scissors: Rock wins.\n'
          'Scissors vs. Paper: Scissors wins.\n'
          'Paper vs. Rock: Paper wins.\n'
          'Same gesture: It\'s a tie; play again.\n'
          '\n')


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

# ask user if they want to see the instructions and display
# them if requested
want_instructions = string_checker("Do you want to read the instructions?")

# checkers users enter yes (Y) or no (N)
if want_instructions == "yes":
    instruction()

print("program")