def return_home(self, ant):
new_best = 0
task = ant.get_goal()
if task in self.best_path:
if len(self.best_path[task]) > ant.get_path_length():
new_best = 1
else:
new_best = 1
if new_best:
self.best_path[task] = ant.get_path()
self.set_max_pheromones(task, calc_max_pheromones(self.evaporation_rate, ant.get_path_length()))
self.set_task_min_pheromones(task)