import tkinter as tk
from tkinter import ttk


root = tk.Tk()

a = tk.BooleanVar()
b = tk.BooleanVar()

print(b.get())

def func_a():
    if a.get():
        print(a.get())
    else:
        print(a.get())

def func_b():
    if b.get():
        print(b.get())
    else:
        print(b.get())

a_btn = tk.Checkbutton(root, text='Yes', variable=a, onvalue=1, offvalue=0, command=func_a, width=15)
a_btn.grid(row=0)
b_btn = tk.Checkbutton(root, text='yes', variable=b, onvalue=1, offvalue=0, command=func_b, width=15)
b_btn.grid(row=1)

root.mainloop()