import random
valid_input = "yes"
play_again = "yes"
while play_again != "no":
    while valid_input == "no":
        player_1 = input("Enter Rock, Paper or Scissors: ")
        options = ["rock", "paper", "scissors"]
        if player_1.lower() not in options:
            print("Please select a valid option")
            valid_input = "no"

        player_2 = random.choice(["Rock", "Paper", "Scissors"])
        print("Player Two chose {}".format(player_2))
        if player_1.lower() == "rock" and player_2.lower() == "rock" or player_1.lower() == "paper" and player_2.lower() == "paper" or player_1.lower() == "scissors" and player_2.lower() == "scissors":
            print("Player One chose {}. Player Two also chose {}. This round is tied!".format(player_1, player_2))
        elif player_1.lower() == "rock" and player_2.lower() == "scissors" or player_1.lower() == "scissors" and player_2.lower() == "paper" or player_1.lower() == "paper" and player_2.lower() == "rock":
            print("{} beats {}. Player One wins!".format(player_1, player_2))
        elif player_2.lower() == "rock" and player_1.lower() == "scissors" or player_2.lower() == "scissors" and player_1.lower() == "paper" or player_2.lower() == "paper" and player_1.lower() == "rock":
            print("{} beats {}. Player Two wins!".format(player_2, player_1))
        play_again = input('Would you like to play another round? (yes/no):')