How can I configure multiple buttons with one function in Tkinter?

Question

def changeColour():
    LT.configure(bg = "white")
    LM.configure(bg = "white")
    LB.configure(bg = "white")

LT = Button(root, width=16, height=8, bg = "blue", command = changeColour)
LT.place(x=10, y=10)

LM = Button(root, width=16, height=8, bg = "red", command = changeColour)
LM.place(x=10, y=150)

LB = Button(root, width=16, height=8, bg = "green", command = changeColour)
LB.place(x=10, y=290)

How do I write the function changeColour() so it changes the colour of the button without a line configuring each button to change colour explicitly?

Answer 1

I'm assuming by "so it changes the colour of the button", you want only the button that was actually clicked to change color.

I know of two approaches.

1. Use lambdas to supply the name of the clicked widget to the function.

def changeColour(widget):
    widget.config(bg="white")

#...

LM = Button(root, width=16, height=8, bg = "red", command = lambda: changeColour(LM))
LM.place(x=10, y=150)

2. Use bind instead of command , as the former can deduce what widget raised the event.

def changeColour(event):
    event.widget.config(bg="white")

#...

LT = Button(root, width=16, height=8, bg = "blue")
LT.bind("<1>", changeColour)
LT.place(x=10, y=10)