(self, interval=None)
Begin autoincrement mode: schedules a recurring timer event
        that calls method step every interval milliseconds.

        interval defaults to 50 milliseconds (20 steps/second) if omitted.
Begin autoincrement mode: schedules a recurring timer event
        that calls method step every interval milliseconds.
Begin autoincrement mode : schedules a recurring timer event that calls method step every interval milliseconds .
def start(self, interval=None):
        """Begin autoincrement mode: schedules a recurring timer event
        that calls method step every interval milliseconds.

        interval defaults to 50 milliseconds (20 steps/second) if omitted."""
        self.tk.call(self._w, "start", interval)
def start ( self , interval = None ) : self . tk . call ( self . _w , "start" , interval )