初学者摇滚，纸艺，剪刀游戏Python语法

Question

我创建了一个Rock Paper Scissors游戏。它询问您是否要玩，接受您的输入，将其与计算机的随机输入进行比较，为您提供结果，然后询问您是否要再次玩。

我不知道为什么它不起作用。请让我知道如何解决它。谢谢你

import random

import sys

#play

def play():

  print('want to play?')

if input()=='yes':

  print("Pick R/P/S")

  user = input()

# RPS

def RPS():

  x = random.choice( ['Rock', 'Paper', 'scissors'] )

print(x)

if x == 'Rock' and user == 'R':

  print('Tie')

elif x == 'Rock' and user == 'P':

  print('You beat Comp')

elif x == 'Rock' and user == 'S':

  print('Beat you')

#--------

if x == 'Paper' and user == 'R':

  print('Lost to comp')

elif x == 'Paper' and user == 'P':

  print('tie')

elif x == 'Paper' and user == 'S':

  print('you beat comp')

#---------

if x == 'scissors' and user == 'R':

  print('Beat comp')

elif x == 'scissors' and user == 'P':

  print('lost comp')

elif x == 'scissors' and user == 'S':

  print('tie')

#Play again

def playagain():

  print('Want to play again')

  play=input()

if play=='yes':

    RPS()

else:

    print("Thanks for playing")

play()

RPS()

playagain()