The Checkbutton widget is a standard Tkinter widgets used to implement on-off selections. Checkbuttons can contain text or images, and you can associate a Python function or method with each button
The Checkbutton widget is used to display a number of options to a user as toggle buttons. The user can then select one or more options by clicking the button corresponding to each option.
w = checkbutton(master, options)
Before cheking the box it won't show any thing on your Consol window, as you can see in below output.
Here, if you check only male then it will print "male: 1, and female: 0" . If you chek only female then it will print "male: 0, and female: 1". and in case if you check both then it will print "male:1, and female: 1". after all if you will click on "Quit" it will take you out of the loop and print ">>>" as shown below.