code: def start_task(self, task):
          
          self.info("Calculating {}...".format(task))
          self.tasks[task] = self.timer()
docs: Begin logging of a task
  
          Stores the time this task was started in order to return
          time lapsed when `complete_task` is called.
  
          Parameters
          ----------
          task : str
              Name of the task to be started