new_contents: #!/usr/bin/env python
  
  """
  The APIRUS API as an Abstract Base Class
  
  """
  
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  
  from abc import ABCMeta, abstractmethod
  
  
  class APIRUS:
      """
      ABC for the API for Regular, Unstructured and Staggered model output
      (APIRUS)
  
      This ABC serves as a way to docuemnt the API, and is designed to be
      subclassed by py_ugrid, py_sgrid and any other future implementations.
  
      """
      __metaclass__ = ABCMeta
  
      @abstractmethod
      def __init__(self):
          """
          this one is probably going to be very differenct for each subclass
          """
          pass
  
      @abstractmethod
      @classmethod
      def from_netcdf(cls, filename):
          """
          load a data set from a netcdf file
          """
          pass
  
subject: Add a start for an ABC for the API