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Python

Posted by Asif Choudhury
Asif Choudhury
2,086 Points

Tkinter: how to update a label at a regular interval?

I am trying to update the label (referred to as lbl in the code below inside the while loop) every second. The problem is label is not updating. The code is not throwing any error message as well.

from tkinter import * import tkinter

TIMER_START_MIN=5 TIMER_START_SEC=5*60 min,sec=divmod(TIMER_START_SEC,60) banner_text="{:02d}:{:02d}".format(min,sec)

def timer_func(): global reset_button global lbl global TIMER_START_SEC global banner_text reset_button.config(state=tkinter.DISABLED)

while(TIMER_START_SEC>0):
     mins,secs=divmod(TIMER_START_SEC,60)
     banner_text="{:02d}:{:02d}".format(min,sec)
     lbl.config(text=banner_text)
     TIMER_START_SEC=TIMER_START_SEC-1

root=Tk()

top_frame=Frame(root) top_frame.pack(side=TOP)

bottom_frame=Frame(root) bottom_frame.pack(side=BOTTOM)

lbl=Label(top_frame,text=banner_text,font=('Helvetica', 36), fg='black') lbl.grid(row=0,column=0)

start_stop_button=Button(bottom_frame,text="START",font=("Helvetica",24),command=timer_func) start_stop_button.grid(row=0,column=0)

reset_button=Button(bottom_frame,text="RESET",font=("Helvetica",24)) reset_button.grid(row=0,column=1)

root.mainloop()

I tried StringVar, textvariable nothing worked for me.