How to remove button in Tkinter while the function called on clicking it is still under execution?

Question

I used tkinter to create a button and assigned a function to it using command parameter. But this function contains some code takes time to execute. I have simulated it here using time.sleep(). I want to remove this button when this button is clicked. For this I called the global variable for button inside the function and then used pack_forget().

from tkinter import *
import time


def signIn():
    global login_button
    login_button.pack_forget()
    # code after this takes some time to run.
    time.sleep(10)


login_screen = Tk()
login_button = Button(login_screen, text="Login", width=10, height=1, command=signIn)
login_button.pack()
login_screen.mainloop()

But the problem is that button gets removed only after the function execution is complete (i.e after 10 seconds). Is there any way I can get the button removed as soon as the pack_forget() line gets executed and not wait for the full function to complete execution?

Does this answer your question? Why does the "geometry()" method work with a delay? — stovfl
– stovfl, Commented May 2, 2020 at 11:46

Bitto · Accepted Answer · 2020-05-02 11:34:55Z

2

Call update_idletasks method of the login_screen window after removing the button.

From effbot:

update_idletasks()

Calls all pending idle tasks, without processing any other events. This can be used to carry out geometry management and redraw widgets if necessary, without calling any callbacks.

def signIn():
    global login_button, login_screen
    login_button.pack_forget()
    login_screen.update_idletasks()
    # code after this takes some time to run.
    time.sleep(10)

edited May 2, 2020 at 11:34

answered May 2, 2020 at 11:29

Bitto

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3 Comments

Dreaded Harvester Over a year ago

nah, I tried this but it still it is taking 10 sec to remove the button.

Bitto Over a year ago

@TarunKhare It is almost instantaneous for me. Could it be that the issue is somewhere else in your code? You might also want to checkout this link.

Dreaded Harvester Over a year ago

I tried update() instead of update_idletasks() and it works!

T Randolph · Accepted Answer · 2022-03-21 16:50:31Z

This worked for me in that situation.

def launch_button(*args):
    # button will show new text when this function is done. The second argument
    # is the new text we're sending to the button
    data_button_widget.configure(text=args[1])
    # schedule launch of the next function, 1 ms after returning to mainloop -
    # The first argument is the function to launch
    data_button_widget.after(1, args[0])


def get_data(*args):
    # button will reconfigure to original text when this function is done
    data_button_widget.configure(text='Original button text')
    <code that takes some time here>

# make a window
wndw = Tk()

# add a frame widget to the window
fram = ttk.Frame(wndw, padding=SM_PAD)
fram.grid(column=0, row=0)
wndw.columnconfigure(0, weight=1)
wndw.rowconfigure(0, weight=1)

# make a button widget
data_button_widget = ttk.Button(fram, command=lambda: launch_button(get_data, 'wait...'))
data_button_widget.grid(column=2, row=4, padx=SM_PAD, pady=LG_PAD)
data_button_widget.configure(text='Original button text')

# start mainloop
wndw.mainloop()

Dreaded Harvester · Accepted Answer · 2020-05-03 05:58:20Z

0

Using update() works:

def signIn():
    global login_button, login_screen
    login_button.pack_forget()
    login_screen.update()
    # code after this takes some time to run.
    time.sleep(10)

answered May 3, 2020 at 5:58

Dreaded Harvester

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