source: vendor/python/2.5/Demo/tkinter/matt/canvas-moving-w-mouse.py

from Tkinter import *

# this file demonstrates the movement of a single canvas item under mouse control

class Test(Frame):
    ###################################################################
    ###### Event callbacks for THE CANVAS (not the stuff drawn on it)
    ###################################################################
    def mouseDown(self, event):
        # remember where the mouse went down
        self.lastx = event.x
        self.lasty = event.y