#Check that users have entered a valid
#option basd 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()


        user_response = user_response.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 instructions
def instructions():
    """Prints instructions"""

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

To begin, choose the number of rounds (or press infinite mode).

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

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

Press <xxx> to end the game at anytime.

Good Luck!   
    """)


# Main routine
print()
print("💎📝✂ Rock / Paper / Scissors Game ✂📝💎")
# ask the user if they want to see the instructions and display them if requested
want_instructions = string_checker("Do you want to see the instructions? ")

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

print("Program continues")