How do I create an automatically updating GUI using Tkinter?

Question

from Tkinter import *
import time
#Tkinter stuff

class App(object):
    def __init__(self):
        self.root = Tk()

        self.labeltitle = Label(root, text=\"\         


        

Answer 1

I wrote an example with Python 3.7

from tkinter import *

def firstFrame(window):
    global first_frame
    first_frame = Frame(window)
    first_frame.place(in_=window, anchor="c", relx=.5, rely=.5)
    Label(first_frame, text="ATTENTION !").grid(row=1,column=1,columnspan=3)


def secondFrame(window):
    global second_frame
    second_frame= Frame(window, highlightbackground=color_green, highlightcolor=color_green, highlightthickness=3)
    second_frame.place(in_=window, anchor="c", relx=.5, rely=.5)
    Label(second_frame, text="This is second frame.").grid(row=1, column=1, columnspan=3, padx=25, pady=(15, 0))


window = Tk()
window.title('Some Title')
window.attributes("-fullscreen", False)
window.resizable(width=True, height=True)
window.geometry('300x200')


firstFrame(window)
secondFrame(window)
first_frame.tkraise()
window.after(5000, lambda: first_frame.destroy()) # you can try different things here
window.mainloop()

Answer 2

If you are using labels, then you can use this:

label = tk.Label(self.frame, bg="green", text="something")
label.place(rely=0, relx=0.05, relwidth=0.9, relheight=0.15)

refresh = tk.Button(frame, bg="white", text="Refreshbutton",command=change_text) 
refresh.pack(rely=0, relx=0.05, relwidth=0.9, relheight=0.15)

def change_text()
   label["text"] = "something else"

Works fine for me, but it is dependent on the need of a button press.

Answer 3

You can use after() to run function after (for example) 1000 miliseconds (1 second) to do something and update text on labels. This function can run itself after 1000 miliseconds again (and again).

It is example with current time

from Tkinter import *
import datetime

root = Tk()

lab = Label(root)
lab.pack()

def clock():
    time = datetime.datetime.now().strftime("Time: %H:%M:%S")
    lab.config(text=time)
    #lab['text'] = time
    root.after(1000, clock) # run itself again after 1000 ms

# run first time
clock()

root.mainloop()

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BTW: you could use StringVar as sundar nataraj Сундар suggested

Answer 4

I added a process bar in my window, and change its value according to randint for every 1 second using the update function:

from random import randint
def update():
    mpb["value"] = randint(0, 100) # take process bar for example
    window.after(1000, update)
update()
window.mainloop()

Answer 5

if you want to change label dynamically

self.dynamiclabel=StringVar()
self.labeltitle = Label(root, text=self.dynamiclabel,  fg="black", font="Helvetica 40 underline bold")
self.dyanamiclabel.set("this label updates upon change")
self.labeltitle.pack()

when ever you get new value then just use .set()

self.dyanamiclabel.set("Hurrray! i got changed")

this apply to all the labels.To know more read this docs