I have created a button but cant find which command to use : i have already created a button using this code; btnLuxury=Button(f1,padx=16,pady=8,bd=16, fg="black",font=('arial', 16,'bold'),width=10,
                text="Luxury", bg="powder blue", command = Luxury).grid(row=8,column=3)

but when i click on it, it does nothing. now i want it to display the amount 8000 in the text box of total amount. what do i type after def, now