def update(self, model):
Pulsator.update(self, model)
nearbyPrey = model.find(lambda x: isinstance(x, Prey) and self.
distance((x.get_location())) <= 200)
toSort = []
for prey in nearbyPrey:
toSort.append((prey, self.distance((prey.get_location()))))
if toSort != []:
prey_to_chase = min(toSort, key=lambda x: x[1])
xp, yp = Prey.get_location(prey_to_chase[0])
xh, yh = self.get_location()
diff_y = yp - yh
diff_x = xp - xh
self.set_angle(atan2(diff_y, diff_x))
Mobile_Simulton.move(self)
