code: def result_relpath(self, package_index):
          
  
          dirname = 'task_{:05d}'.format(package_index)
          # e.g., 'task_00009'
  
          ret = os.path.join('results', dirname, 'result.p.gz')
          # e.g., 'results/task_00009/result.p.gz'
  
          return ret
docs: Returns the relative path of the result
  
          This method returns the path to the result relative to the
          top dir of the working area. This method simply constructs the
          path based on the convention and doesn't check if the result
          actually exists.
  
          Parameters
          ----------
          package_index :
              a package index
  
          Returns
          -------
          str
              the relative path to the result