python - Why does my variable not increment after one time? -

when user submits answer , wrong, def getresult() should make "mistake" variable goes 1 when user makes first error , mistake changes 0 1. after that, when user enter wrong answer, variable still ends "1" again. there way increment when user wrong?

from tkinter import * import random root = tk()  root.wm_title("hangman")  canvas = canvas(root, height=400, width=800) canvas.pack() name = ''  def titlescreen():     title = canvas.create_text(400, 100, font=("times new roman", 50), tags="title")     canvas.itemconfig(title, text="hangman: game")      startbutton = button(canvas, text="start game", width=10, command=startgame)     canvas.create_window(400, 200, window = startbutton)      creditsbutton = button(canvas, text="credits", width=10, command=displaycredits)     canvas.create_window(400, 250, window = creditsbutton)  def startgame():     def getname(nameentry):         global name         name = nameentry.get()         print (name)         drawpole()        canvas.delete(all)     welcome = canvas.create_text(400,100,font=("times new roman",50),text="welcome!")     welcome2 = canvas.create_text(400,150,font=("times new roman", 30),text="please enter name")       nameentry = entry(canvas)     entername = button(canvas, text="enter", width=10, command=lambda: getname(nameentry))       canvas.create_window(350, 200, window = nameentry)     canvas.create_window(490, 200, window = entername)       nameentry.delete(0,end)     nameentry.insert(0, "enter player name")   def displaycredits():     canvas.delete(all)     created = canvas.create_text(400,100,font=("times new roman",50),text="created by")     credit1 = canvas.create_text(400,150,text="patrick tsui & ricardo perez")     credit2 = canvas.create_text(400,170,text="montclair state university students")     backbutton = button(canvas,text="back title screen",width=30,command=backtotitle)     canvas.create_window(400, 200, window=backbutton)  def backtotitle():     canvas.delete(all)     titlescreen()  def drawpole():     canvas.delete(all)     = canvas.create_rectangle(550,50,550,350,fill = "black")     b = canvas.create_rectangle(350,50,550,50,fill = "black")     c = canvas.create_rectangle(350,50,350,90,fill = "black")     gameplay()      def gameplay():      def getanswer():         global answer         answer = answer1.get()         print (answer)          getresult()      def getresult():         global result2         global mistake         mistake = 0         result2 = result          if str(result2) == answer:             canvas.create_text(300, 375, text="correct!",fill="green", tags="result")         else:             canvas.create_text(300, 375, text="wrong!",fill="red", tags="result")             d = canvas.create_oval(325, 90, 375, 140, outline = "black")             mistake += 1          print (result2)         print (mistake)         continue()      def continue():         canvas.delete("confirm")                 continuebutton = button(canvas,text="continue",width=10,command=gameplay)         canvas.create_window(450, 350, window = continuebutton, tags="continue")       canvas.delete("question")     canvas.delete("continue")     canvas.delete("result")     x = random.randint(1,100)     y = random.randint(1,100)     questions = random.randint(0,3)      answer1 = entry(canvas)     confirmbutton = button(canvas,text="confirm",width=10,command=getanswer)      canvas.create_window(300, 350, window = answer1)     canvas.create_window(450, 350, window = confirmbutton, tags="confirm")      answer1.delete(0,end)     answer1.insert(0, "enter answer")      if questions == 0:         result = x + y         question1= canvas.create_text(350, 300, text=("add: " + str(x) + " + " + str(y)), tags="question")       if questions == 1:         result = x - y         question1= canvas.create_text(350, 300, text=("subtract: " + str(x) + " - " + str(y)), tags="question")       if questions == 2:         result = x * y         question1= canvas.create_text(350, 300, text=("multiply: " + str(x) + " * " + str(y)), tags="question")       if questions == 3:         result = x // y         question1= canvas.create_text(350, 300, text=("divide: " + str(x) + " / " + str(y)), tags="question")  titlescreen()  root.mainloop()  

you first have declare mistake variable right after imports:

mistake=0 

if don't this, mistake variables in functions local.