Please note: read the guideline before starting.

Let's implement 3 classes with inheritance

BaseRobot

• constructor takes name, weight, coords, and saves them
• coords is list with x and y coordinates, set to [0, 0] by default. It is not a good practice to use mutable object as a default parameter, set it to None by default, and use condition.
• go_forward, go_back, go_right and go_left methods take a step argument (1 by default) and move the robot by step in the appropriate direction. Positive Y axis is forward, positive X axis is right.
• get_info method returns a string in the next format Robot: {name}, Weight: {weight}

robot = BaseRobot(name="Walle", weight=34, coords=[3, -2])
robot.go_forward()
robot.coords == [3, -1]
robot.go_right(5)
robot.coords == [8, -1]

FlyingRobot

• inherits from BaseRobot
• takes the same args as BaseRobot and passes them to the parent's constructor (use super)
• can work with z coordinate, coords by default should be [0, 0, 0], use condition to send right coords to parent's constructor
• has methods go_up and go_down changing z, positive Z axis is up

flying_robot = FlyingRobot(name="Mike", weight=11)
flying_robot.go_up(10)
flying_robot.coords = [0, 0, 10]

DeliveryDrone

• inherits from FlyingRobot
• takes the same args as FlyingRobot and passes them to the parent's constructor.
• constructor also takes and stores max_load_weight and current_load.
• has hook_load method taking Cargo object and saves it to current_load if current_load is None and cargo.weight not greater than max_load_weight of the drone
• has unhook_load method, that set current_load to None

cargo = Cargo(14)
drone = DeliveryDrone(name="Jim", weight=18, coords=[11, -4, 16], 
                      max_load_weight=20, current_load=None)
drone.hook_load(cargo)
drone.current_load is cargo

cargo2 = Cargo(2)
drone.hook_load(cargo2)
drone.current_load is cargo  
# didn't hook cargo2, cargo already in current load

drone = DeliveryDrone(name="Jack", 
                      weight=9, 
                      max_load_weight=30, 
                      current_load=Cargo(20))
drone.unhook_load()
drone.current_load is None