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Code: Alles auswählen

import tkinter as tk

class App:
    def __init__(self):
        self.master = tk.Toplevel()
        self.check_var = tk.IntVar(self.master)
        self.check_var.set(1)

        checkbox = tk.Checkbutton(self.master, variable = self.check_var)
        checkbox.pack()

master = tk.Tk()
App()
master.mainloop()

Code: Alles auswählen

import tkinter as tk

class App:
    def __init__(self):
        self.master = tk.Toplevel()
        self.check_var = tk.IntVar(self.master)
        self.check_var.set(1)

        checkbox = tk.Checkbutton(self.master, variable = self.check_var)
        button = tk.Button(self.master, text = "Checked?",
                           command = self.print_number)
        checkbox.pack()
        button.pack()

    def print_number(self):
        print(self.check_var.get())

master = tk.Tk()
App()
master.mainloop()