multi threading으로 센서에서 데이터를 읽어와 GUI(Tkinter)와 연동하기

아래에 자세한 코드가 있음

출처 : http://stackoverflow.com/questions/25351488/intermittent-python-thread-error-main-thread-is-not-in-main-loop

from Tkinter import *
import tkFont
import os
import glob
import time
import threading
import Image 
import Queue


def update_temp(queue):
    """ Read the temp data. This runs in a background thread. """
    while True:
        #   28-000005c6ba08
        i = "28-000005c6ba08"
        base_dir = '/sys/bus/w1/devices/'
        device_folder = glob.glob(base_dir + i)[0]
        device_file = device_folder + '/w1_slave'

        tempread=round(read_temp(),1)

        # Pass the temp back to the main thread.
        queue.put(tempread)
        time.sleep(5)

class Gui(object):
    def __init__(self, queue):
        self.queue = queue

        #Make the window
        self.root = Tk() 
        self.root.wm_title("Home Management System")
        self.root.minsize(1440,1000)

        self.equipTemp = StringVar()   
        self.equipTemp1 = StringVar()
        self.equipTemp2 = StringVar()       

        self.customFont = tkFont.Font(family="Helvetica", size=16)

        #   1st floor Image
        img = Image.open("HOUSE-PLANS-01.png") 
        photo = ImageTk.PhotoImage(img)

        Label1=Label(self.root, image=photo)
        Label1.place(x=100, y=100)

        #   2nd floor
        img2 = Image.open("HOUSE-PLANS-02.png")
        photo2 = ImageTk.PhotoImage(img2)

        Label1=Label(self.root, image=photo2)
        Label1.place(x=600, y=100)

        #   Basement image
        img3 = Image.open("HOUSE-PLANS-03.png")
        photo3 = ImageTk.PhotoImage(img3)

        Label1=Label(self.root, image=photo3)
        Label1.place(x=100, y=500)

        #   Attic Image
        img4 = Image.open("HOUSE-PLANS-04.png")
        photo4 = ImageTk.PhotoImage(img4)

        Label1=Label(self.root, image=photo4)
        Label1.place(x=600, y=500)

        #   House Isometric Image
        img5 = Image.open("house-iso.png")
        photo5 = ImageTk.PhotoImage(img5)

        Label1=Label(self.root, image=photo5)
        Label1.place(x=1080, y=130)

        #Garage Temp Label
        Label2=Label(self.root, textvariable=self.equipTemp, width=6, justify=RIGHT, font=self.customFont)
        Label2.place(x=315, y=265)

        print "start monitoring and updating the GUI"

        # Schedule read_queue to run in the main thread in one second.
        self.root.after(1000, self.read_queue)

    def read_queue(self):
        """ Check for updated temp data"""
        try:
            temp = self.queue.get_nowait()
            self.equipTemp.set(temp)
        except Queue.Empty:
            # It's ok if there's no data to read.
            # We'll just check again later.
            pass
        # Schedule read_queue again in one second.
        self.root.after(1000, self.read_queue)

if __name__ == "__main__":
    queue = Queue.Queue()
    # Start background thread to get temp data
    t = threading.Thread(target=update_temp, args=(queue,))
    t.start()
    print "starting app"
    # Build GUI object
    gui = Gui(queue)
    # Start mainloop
    gui.root.mainloop()