# 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 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()



def instructions():
    """Prints instructions"""

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

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

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

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

# Main routine
print()
print("🪨📃✂️ Rock / Paper / Scissors Game ✂️📃🪨")
print()
# ask the user if they want instructions (check they say yes / no)
want_instructions = string_checker("Do you want to see the instructions? ")

# Display the instructions if the user wants to see them...
if want_instructions == "yes":
    instructions()

print()
print("Program continues")