tkinter changeable value on canvas

Question

I want to change the text label on a canvas when buttons are clicked. I want to increase the label by 10 if the button \"up\" is clicked and decrease by 10 if the button \"down\

Answer 1

You can use the documented itemconfigure method of the canvas to change any configuration option of any object on the canvas.

For example, you could write a method named change_consumption that takes a parameter for how much to change the value by, and it can use itemconfigure to change what appears on the canvas:

def change_consumption(self, amount):
    self.consumption += amount
    self.canvas.itemconfigure(self.cons, text=self.consumption)

You would bind to this function like this for the "up" button; for "down" you would pass -10:

self.but.bind("", lambda event: self.change_consumption(10))