from random import *
#Start of function "rps" (rock paper scissors)
def rps():
    #chooses a random number between 1 and 3, uses that to determine rock/paper/scissor choice
    x = randint(1,3)
    if x == 1:
        x = "rock"
    if x == 2:
        x = "paper"
    else:
        x = "scissors"

    y = input("Rock, paper, or scissors? ")
    #checks to see if the input was valid, if it's not you get a message and it asks for a new input by calling the whole function again.
    if (y != "Rock") and (y != "rock") and (y != "Paper") and (y != "paper") and (y != "Scissors") and (y != "scissors") :
        print("Invalid input. Please choose rock, paper, or scissors.")
        rps()
    print("I'm going to choose...",x)

    #checks for a tie
    if x == y:
        print("Tie!")
    if x == "rock":
        x = "Rock"
    if x == "paper":
        x = "Paper"
    else:
        x = "Scissors"
    if x == y:
        print("Tie!")

    #checks other win conditions
    if x == "Rock":
        if (y == "Scissors") or (y == "scissors"):
            print("You lose!")
        if (y == "Paper") or (y == "paper"):
            print ("You win!")

    if x == "Paper":
        if (y == "Rock") or (y == "rock"):
            print("You lose!")
        if (y == "Scissors") or (y == "scissors"):
            print ("You win!")

    if x == "Scissors":
        if (y == "Paper") or (y == "paper"):
            print("You lose!")
        if (y == "Rock") or (y == "rock"):
            print ("You win!")
    rps()
    #calls itself to loop endlessly
    return;
#end of function rps
rps()