How do I get a check button value in Python tkinter

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I have a check button in my program. when I click the check button, the var value is always 0. Shouldn't the value be 1 when clicked. It works in a small program that i made but when I try to get a check button value in my big program, the value is always 0 no matter how many times I click the checkbutton.

What I have tried:

I have tried a sample program to get the var value of the check button but when I try to do the same thing in my bigger program, the var value is always 0