name : animation-w-velocity-ctrl.py from Tkinter import * # this is the same as simple-demo-1.py, but uses # subclassing. # note that there is no explicit call to start Tk. # Tkinter is smart enough to start the system if it's not already going. class Test(Frame): def printit(self): print "hi" def createWidgets(self): self.QUIT = Button(self, text='QUIT', foreground='red', command=self.quit) self.QUIT.pack(side=BOTTOM, fill=BOTH) self.draw = Canvas(self, width="5i", height="5i") self.speed = Scale(self, orient=HORIZONTAL, from_=-100, to=100) self.speed.pack(side=BOTTOM, fill=X) # all of these work.. self.draw.create_rectangle(0, 0, 10, 10, tags="thing", fill="blue") self.draw.pack(side=LEFT) def moveThing(self, *args): velocity = self.speed.get() str = float(velocity) / 1000.0 str = "%ri" % (str,) self.draw.move("thing", str, str) self.after(10, self.moveThing) def __init__(self, master=None): Frame.__init__(self, master) Pack.config(self) self.createWidgets() self.after(10, self.moveThing) test = Test() test.mainloop()