간단한 GUI 코드 Tkinter 콜백 오류 받기

Question

그래서 저는 나무 딸기 파이에서하고있는 작은 프로젝트에서이 GUI를 만들려고합니다. 기본적으로 상태 머신은 버튼 프레스를 기반으로 상태를 바꿉니다 (약간의 퀴즈처럼 상상해보십시오). 내가 모듈을 실행할 때 몇 가지 이유를 들어, 나는 말한다 오류 얻을 :이 오류 코드를 기반으로 인터넷의 주위에 많이 검색했습니다

Exception in Tkinter callback 
Traceback (most recent call last): 
File:"/usr/lib/python2.7/lib-tk/Tkinter.py", line 1535, in __call__ 
    return self.func(*args) 
File:"/usr/lib/python2.7/lib-tk/Tkinter.py", line 586, in callit 
    func(*args) 
File "/home/pi/Desktop/SafetyDoorknob.py", line 79, in safety_loop 
NameError: global name 'currentState' is not defined 

을,하지만 난 도움이되었습니다 아무것도 발견하지 않았습니다 . 저는 Python과 Tkinter를 처음 사용했습니다. (지난 주 안에) 여기있는 사람이 도움이 될지 알고 싶었습니다. 아래에 내 코드 사본이 있습니다. 사전에 어떤 도움을 주셔서 감사합니다 그리고 난 아직도 물건

import Tkinter as tk 
from PIL import Image, ImageTk 
import requests 
import time 
import RPi.GPIO as GPIO 
import random 
import os 
import sys 

Button_A = 29 # The GPIO pin the button is attached to 
Button_B = 31 # The GPIO pin the button is attached to 
Button_C = 33 # The GPIO pin the button is attached to 
Button_D = 35 # The GPIO pin the button is attached to 
Button_Confirm = 37 # The GPIO pin the button is attached to 

Relay_Contact = 38 

#//////Setting up the pinmodes/////// 
GPIO.setmode(GPIO.BCM) #Defines what the numbering scheme is for the pins 
GPIO.setup(Button_A, GPIO.IN, pull_up_down=GPIO.PUD_UP) #Setting the button as an input and turning on some Pull-up resistors 
GPIO.setup(Button_B, GPIO.IN, pull_up_down=GPIO.PUD_UP) 
GPIO.setup(Button_C, GPIO.IN, pull_up_down=GPIO.PUD_UP) 
GPIO.setup(Button_D, GPIO.IN, pull_up_down=GPIO.PUD_UP) 
GPIO.setup(Button_Confirm, GPIO.IN,pull_up_down=GPIO.PUD_UP) 

GPIO.setup(Relay_Contact, GPIO.OUT) #Making the Relay contact an output. 

global usableQuestions 
global currentState 
global stateStartTime 
global picPath 
global correctAnswer 
global allAnswers 

mainFolderPath = "/home/pi/SafetyDoorknob/AllQuestions" #All Level Folders will be in SafetyDoorknob 
answersPath = "/home/pi/SafetyDoorknob/DoorknobAnswers.txt" 
picPath = "/home/pi/SafetyDoorknob/HomeScreen.jpg" 
answers_file = open(answersPath,'r') 
allAnswers = answers_file.readline().split(",") #Load all answers into String Array 
usableQuestions = os.listdir(mainFolderPath) 


root = tk.Tk() 
root.geometry("800x480") 
root.configure(background = 'black') 
root.wm_attributes('-type','splash') 

def buttonPressToAnswer(): 
    currentAnswer = "" 

    if GPIO.input(Button_A) == 0: 
     time.sleep(0.02) 
     currentAnswer = "A" 
    elif GPIO.input(Button_B) == 0: 
     time.sleep(0.02) 
     currentAnswer = "B" 
    elif GPIO.input(Button_C) == 0: 
     time.sleep(0.02) 
     currentAnswer = "C" 
    elif GPIO.input(Button_D) == 0: 
     time.sleep(0.02) 
     currentAnswer = "D" 

    return currentAnswer 


def get_State_Time(): 

    stateTime = time.time() - stateStartTime 
    return int(round(stateTime)) 

def setState(newState): 
    currentState = newState 
    stateStartTime = time.time() 

def safety_loop(): 

    if currentState == 0: #Startup State 
     picPath = "/home/pi/SafetyDoorknob/HomeScreen.jpg" 

     if GPIO.input(Button_Confirm) == 0: 
      time.sleep(0.02) 
      while GPIO.input(Button_Confirm) == 0: 
       pass 
      setState(1) 
      picPath = pick_rand_img() 
     root.after(10,safety_loop) 

    elif currentState == 1: #Question 1 State 
     while get_State_Time() <= 120: 
      if buttonPressToAnswer() == correctAnswer: 
       break 
      else: 
       pass 
     if get_State_Time() <=120: 
      setState(2) 
      picPath = pick_rand_img() 
     else: 
      setState(0) 

     root.after(10,safety_loop) 

    elif currentState == 2: #Question 2 State 
     while get_State_Time() <= 120: 
      if buttonPressToAnswer() == correctAnswer: 
       break 
      else: 
       pass 
     if get_State_Time() <=120: 
      setState(3) 
      picPath = pick_rand_img() 
     else: 
      setState(0) 

     root.after(10,safety_loop) 

    elif currentState == 3: #Question 3 State 
     while get_State_Time() <= 120: 
      if buttonPressToAnswer() == correctAnswer: 
       break 
      else: 
       pass 
     if get_State_Time() <=120: 
      setState(4) 
      picPath = pick_rand_img() 
     else: 
      setState(0) 

     root.after(10,safety_loop) 

    elif currentState == 4: #Door Open State 

     GPIO.output(Relay_Contact,1) 
     time.sleep(60) 
     GPIO.output(Relay_Contact,0) 


def pick_rand_img(): 

    if len(usableQuestions) == 0: 

     usableQuestions = os.listdir(mainFolderPath) 


    randomIndex = random.randint(0,len(usableQuestions) - 1) 
    randQuestion = usableQuestions[randomIndex] #Picks random question 
    correctAnswer = allAnswers[randomIndex] 


    newQuestionPath = mainFolderPath + randQuestion 
    usableQuestions.pop(randomIndex) 
    allAnswers.pop(randomIndex) 

    return newQuestionPath 

img = ImageTk.PhotoImage(Image.open(picPath)) 
panel = tk.Label(root,image = img) 

panel.pack(side = "bottom",fill = "both",expand = "yes") 
setState(0) 
root.after(10,safety_loop) 
root.mainloop() 

Answer 1

의 종류를 배우고과 같이 setState 기능을 전역 변수에 currentState을해야 나와 함께 곰하시기 바랍니다.

def setState(newState): 
    currentState = newState 

다른 기능을 사용할 수있는, setState에서 로컬 변수를 만들었다.

def setState(newState): 
    ## make currentStage and stateStartTime global 
    global currentState, stateStartTime 
    currentState = newState 
    stateStartTime = time.time() 

당신은 또한 global 키워드를 사용해야 나는 일부 모듈이없는 완벽하기 때문에 코드를 테스트 할 수 있습니다 (글로벌 변수를 변경 다른 기능에 전술 표시 -as : 귀하의 setState funnction이 있어야한다)