Python Rock Paper Scissors game

import random
score = 0
choice = ["rock","scissors","paper"]
x = random.choice(choice)

def rockpaperscissors():
  print(score)
user1 = input("Choose rock, scissors or paper")
if (x == "rock" and user1 == "rock") or (x == "paper" and user1 == "paper") or (x ==  "scissors" and user1 == "scissors"):
  print ("tie")
elif (x == "rock" and user1 == "paper") or (x == "scissors" and user1 == "rock") or (x== "paper" and user1 == "scissors"):
  print ("you win")
  score+=1
elif (x == "paper" and user1 == "rock") or (x == "scissors" and user1 == "paper") or (x == "paper" and user1 == "rock"):
  print ("you lose")
  score-=1
else:
  print ("error, try again")
  
  rockpaperscissors()