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()
Turns turtle animation on/off and set delay for update drawings.
dataset/ETHPy150Open amrdraz/kodr/app/brython/www/src/Lib/site-packages/turtle.py/TurtleScreen.tracer