(self, n=None, delay=None)
Turns turtle animation on/off and set delay for update drawings.

        Optional arguments:
        n -- nonnegative  integer
        delay -- nonnegative  integer

        If n is given, only each n-th regular screen update is really performed.
        (Can be used to accelerate the drawing of complex graphics.)
        Second arguments sets delay value (see RawTurtle.delay())

        Example (for a TurtleScreen instance named screen):
        >>> screen.tracer(8, 25)
        >>> dist = 2
        >>> for i in range(200):
        ...     fd(dist)
        ...     rt(90)
        ...     dist += 2
Turns turtle animation on/off and set delay for update drawings.
Turns turtle animation on / off and set delay for update drawings .
def tracer(self, n=None, delay=None):
        """Turns turtle animation on/off and set delay for update drawings.

        Optional arguments:
        n -- nonnegative  integer
        delay -- nonnegative  integer

        If n is given, only each n-th regular screen update is really performed.
        (Can be used to accelerate the drawing of complex graphics.)
        Second arguments sets delay value (see RawTurtle.delay())

        Example (for a TurtleScreen instance named screen):
        >>> screen.tracer(8, 25)
        >>> dist = 2
        >>> for i in range(200):
        ...     fd(dist)
        ...     rt(90)
        ...     dist += 2
        """
        if n is None:
            return self._tracing
        self._tracing = int(n)
        self._updatecounter = 0
        if delay is not None:
            self._delayvalue = int(delay)
        if self._tracing:
            self.update()
def tracer ( self , n = None , delay = None ) : if n is None : return self . _tracing self . _tracing = int ( n ) self . _updatecounter = 0 if delay is not None : self . _delayvalue = int ( delay ) if self . _tracing : self . update ( )