code: def get_person_usage(person, project, start, end):
      
      try:
          cache = PersonCache.objects.get(
              person=person, project=project, date=datetime.date.today(),
              start=start, end=end)
          return cache.cpu_time, cache.no_jobs
      except PersonCache.DoesNotExist:
          return 0, 0
docs: Return a tuple of cpu hours and number of jobs for a person in a
      specific project
  
      Keyword arguments:
      person --
      project -- The project the usage is from
      start -- start date
      end -- end date