Python Tkinter - change the canvas size after inital declaration

Question

I want to change the canvas size after I have added some widgets to it

Example:

from Tkinter import * 

master = Tk()
w = Canvas(master, width=100, height=100)
w.config(bg='white')
w.create_oval(90,90,110,110, width=0, fill = "ivory3")
w = Canvas(master, width=200, height=200)
w.pack()
mainloop()

But it seem that when I re-declare the canvas size, the objects get removed. Is it possible to update the canvas after I have created some objects on it?

Answer 1

What you are looking for is the configure option, as is documentered here. Basically, something like this should help, in place of creating a new canvas:

w.config(width=200, height=200)

For reference, the reason why everything got deleted off of the Canvas is because you created a brand new Canvas, with a different size and the same name. If you are going to change properties of an existing object, you must change the existing object, and not overwrite it. Basically you overwrite something if you declare it equal to something else (w=Canvas(...)).