问TypeError：“kivy.weakproxy.WeakProxy”对象不可调用

EN

File "c:\Users\sorus\OneDrive\Desktop\New folder (2)\dear_pygui\update_label.kv", line 24, in <module>
     on_press : root.sang()
 TypeError: 'kivy.weakproxy.WeakProxy' object is not callable

import kivy
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button
from kivy.core.window import Window
from kivy.lang import Builder
import random
from kivy.uix.widget import Widget

game_list = ["Sang" , "Kaqaz" , "Qeichi"]
user_score = 0
computer_score = 0
random_choose = random.choice(game_list)


Builder.load_file("update_label.kv")        


class MainPage(Widget):





def sang(self):
    global computer_score
    global user_score
    global random_choose

    random_choose = random.choice(game_list)
    choose = "Sang"
    if random_choose == "Kaqaz" and choose == "Sang":
        computer_score += 1
    elif random_choose == "Qeichi" and choose == "Sang":
        user_score += 1
    else:
        pass

    
    
    
def kaqaz(self):

    global computer_score
    global user_score
    global random_choose
    


    random_choose = random.choice(game_list)
    

    choose = "Kaqaz"
    if random_choose == "Qeichi" and choose == "Kaqaz":
        computer_score += 1
    elif random_choose == "Sang" and choose == "Kaqaz":
        user_score +=1
    else:
        pass


    
def qeichi(self):
    global computer_score
    global user_score
    global random_choose
    random_choose = random.choice(game_list)

    choose = "Qeichi"

    if random_choose == "Kaqaz" and choose == "Qeichi":
        user_score += 1
    elif random_choose == "Sang" and choose == "Qeichi":
        computer_score += 1
    else:
        pass
    
def restart(self):
    global computer_score
    global user_score

    user_score = 0
    computer_score = 0


def update(self):
    global computer_score
    global user_score
    global random_choose
    self.random_choose.text = ("Bot :" + random_choose)
    self.your_label.text = ("Your Score :" + str(user_score))
    self.computer_label.text = ("Computer Score : " + str(computer_score))
    

def on_touch_up(self, touch):
    self.update()





    
class Myapp(App):
    def build(self):
        return MainPage()
    



if __name__ == "__main__":
    Myapp().run()

<MainPage>

 sang : sang
 kaqaz : kaqaz
 qeichi : qeichi
 restart : restart
 random_choose : random_choose
 user_score : user_score
 computer_score : computer_score
 GridLayout:
     cols : 1
     size : root.width , root.height

     Label:
         id : random_choose
         text : "Hi"

     GridLayout:
         cols : 1

         Button:
             id : sang
             text : "Sang"
             on_press : root.sang()

         Button:
             id : kaqaz
             text : "Kaqaz"
             on_press : root.kaqaz()

         Button:
             id : qeichi
             text : "Qeichi"
             on_press : root.qeichi()
         



         Label :
             id : user_score
             text : "Your Score :" 
         Label :
             id : computer_score
             text : "Computer Score :"

         Button:
             id : restart
             text : "Restart"
             on_press : root.restart()