rock_paper_scissors

def check_input(user_input):
    allowed = ["rock", "paper", "scissors"]
    if user_input in allowed:
        return user_input
    return check_input(input("Please enter a valid input: "))


print("""

Welcome to rock, paper, scissors.

This is a two players game, please type rock, paper, or scissors when asked for input

""")
again = "y"

while(again == "y"):
    player1 = check_input(input("Player 1 : "))
    player2 = check_input(input("Player 2 : "))
    if player1 == player2:
        print("\nIt's a tie, please try again :)\n")


    if player1=="rock" and player2=="paper":
        print("\nPlayer 2 won\n")

    if player1=="rock" and player2=="scissors":
        print("\nplayer 1 won\n")

    if player1=='paper' and player2=='scissors':
        print("\nPlayer 1 won\n")

    if player1=='paper' and player2=='rock':
        print('\nPlayer 2 won\n')

    if player1=='scissors' and player2=='rock':
        print('\nPlayer 2 won\n')

    if player1=='scissors' and player2=='paper':
        print('\nPlayer 1 won\n')

    again = input("\nDo you want to play again ? (y/n)\n")