Python. variable +=1 is not working as it should be in turtle

October 29, 2022

I’m trying to make something like a "clicker" on buttons for 2 person’s, but my variable +=1 is not working in this program. My code:

from tkinter import *
import turtle
wn = turtle.Screen()
wn.title("Pong by Daniel")
wn.bgcolor("black")
wn.setup(width=800, height=600)
wn.tracer(0)
score_a = 0
score_b = 0

pen = turtle.Turtle()
pen.speed(0)
pen.color("white")
pen.penup()
pen.hideturtle()
pen.goto(0, 240)
pen.write("a:0  b: 0", align="center", font=("Courier", 24, "normal"))
     
button_a = Button( text="a")
button_a.place(x=530, y=300)
button_b = Button( text="b")
button_b.place(x=130, y=300)

def button_a():
     score_a+= 1
     pen.clear()
     pen.write("a:{}  b: {}".format(score_a, score_b), align="center", font=("Courier", 24, "normal"))
def button_b():
     score_b += 1
     pen.clear()
     pen.write("a:{}  b: {}".format(score_a, score_b), align="center", font=("Courier", 24, "normal"))

     
while True:
     wn.update()    
     turtle.onclick(button_a)
     turtle.onclick(button_b)

i cant put those variables in def, bcs it would reset all the time(i think), somebody have any idea, opinion on this? Im new in programming, and need to learn a lot.

I have tried using it without def, but i need it when im using turtle.onclick, i dont know how to move from this point.

>Solution :

there is nothing wrong with variable += 1. Its not working because of scope issue and not defind commend to buttons. Try this:

from tkinter import *
import turtle

wn = turtle.Screen()
wn.title("Pong by Daniel")
wn.bgcolor("black")
wn.setup(width=800, height=600)
wn.tracer(0)
score_a = 0
score_b = 0

pen = turtle.Turtle()
pen.speed(0)
pen.color("white")
pen.penup()
pen.hideturtle()
pen.goto(0, 240)
pen.write("a:0  b: 0", align="center", font=("Courier", 24, "normal"))



def button_a_1():
   print("hello")
   global score_a
   score_a += 1
   pen.clear()
   pen.write("a:{}  b: {}".format(score_a, score_b), 
   align="center", font=("Courier", 24, "normal"))


def button_b_1():
   global score_b
   score_b += 1
   pen.clear()
   pen.write("a:{}  b: {}".format(score_a, score_b), 
   align="center", font=("Courier", 24, "normal"))


button_a = Button(text="a", command=button_a_1)
button_a.place(x=530, y=300)
button_b = Button(text="b", command=button_b_1)
button_b.place(x=130, y=300)

while True:
   wn.update()
   turtle.onclick(button_a_1)
   turtle.onclick(button_b_1)