docs: def get_project_usage(project, start, end):
      """Return a tuple of cpu hours and number of jobs for a project
      for a given period
  
      Keyword arguments:
      project --
      start -- start date
      end -- end date
  
      """
      try:
          cache = ProjectCache.objects.get(
              project=project, date=datetime.date.today(),
              start=start, end=end)
          return cache.cpu_time, cache.no_jobs
      except ProjectCache.DoesNotExist:
          return 0, 0