code: def get_tasks_with_tag(self, tag, params={}, **options): 
          
          path = "/tags/%s/tasks" % (tag)
          return self.client.get_collection(path, params, **options)
docs: Returns the compact task records for all tasks with the given tag.
          Tasks can have more than one tag at a time.
  
          Parameters
          ----------
          tag : {Id} The tag to fetch tasks from.
          [params] : {Object} Parameters for the request