Python/tkinter - Getting the current value of the checkbox variable

Question

I'd like to print the current value of the checkbox variable. Instead I get the last before the click. what am I doing wrong?

import tkinter as tk

def widget(frame):
    chbx_value = 0
    widget_col_span = 1

    # widgets checkbox
    var_c = tk.IntVar(master=frame, value=chbx_value)
    widget_c = tk.Checkbutton(master=frame, text='', variable=var_c)
    widget_c.bind("<ButtonRelease>", lambda event: print(var_c.get()))
    widget_c.grid(row=0, column=0, columnspan=widget_col_span, padx=1, pady=1, sticky="ns")

root = tk.Tk()
root.title('My Window')
widget(root)
root.mainloop()

Tranbi · Accepted Answer · 2022-09-30 11:30:20Z

1

The event <ButtonRelease> obviously occurs before your variable has changed. My advice would be to use the command kwarg in the Checkbutton constructor. Besides, it probably makes more sense to use a boolean as variable:

import tkinter as tk

def widget(frame):
    widget_col_span = 1

    # widgets checkbox
    var_c = tk.BooleanVar(master=frame)
    widget_c = tk.Checkbutton(master=frame, text='', variable=var_c, command=lambda: print(var_c.get()))
    widget_c.grid(row=0, column=0, columnspan=widget_col_span, padx=1, pady=1, sticky="ns")

root = tk.Tk()
root.title('My Window')
widget(root)
root.mainloop()

answered Sep 30, 2022 at 11:30

Tranbi

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2 Comments

drSlump Over a year ago

any way to make it occur after the variable changes using my approach?

Tranbi Over a year ago

I don't really see how... it would probably be much more convoluted to achieve the same result. Another solution would be to trace your variable instead: var_c.trace("w", lambda *args : print(var_c.get()))

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