def generate(self):
#creates a planet
planet = Planet()
#adds a random number of humans and robots to the planet object
for index in range(random.randint(1, 10)):
robot = Robot(f"Robot{index}")
planet.add_robot(robot)
for index in range(random.randint(1, 10)):
human = Human(f"Human{index}")
planet.add_human(human)
# add to list of planets
self.planets.append(planet)
