self_driving_car.py

from object_detector import ObjectDetector


class SelfDrivingCar(object):

    def __init__(self):
        self.speed = 0
        self.destination = None

    def _accelerate(self):
        self.speed += 1

    def _decelerate(self):
        if self.speed > 0:
            self.speed -= 1

    def _advance_to_destination(self):
        distance = self._calculate_distance_to_object_in_front()
        if distance < 1:
            self.stop()
            self._arrive()
        elif distance < self.speed / 2:
            self._decelerate()
        elif self.speed < self._get_speed_limit():
            self._accelerate()

    def _arrive(self):
        self._arrived = True

    def _has_arrived(self):
        return self._arrived

    def _calculate_distance_to_object_in_front(self):
        return ObjectDetector().calculate_distance_to_object_in_front(
            self.destination
        )

    def _get_speed_limit(self):
        return 60

    def stop(self):
        self.speed = 0

    def drive(self, destination):
        self._arrived = False

        while not self._has_arrived():
            self._advance_to_destination()
        self.stop()