Method speed

Python/Turtle.py:1902–1903

dummy method - to be overwritten by child class

(self, s=0)

## three dummy methods to be implemented by child class:

    def speed(self, s=0):
        """dummy method - to be overwritten by child class"""
    def _tracer(self, a=None, b=None):
        """dummy method - to be overwritten by child class"""
    def _delay(self, n=None):