import tkinter

def check():
    if cval.get() == True:
        print('已勾選')
    else:
        print('未勾選')

root = tkinter.Tk()
root.title('取得勾選狀態')
root.geometry('400x200')
cval = tkinter.BooleanVar()
cval.set(False)
cbtn = tkinter.Checkbutton(text = '勾選按鈕', variable = cval, command = check)
cbtn.pack()
root.mainloop()