old_contents: from zope.interface import implements
  from interfaces import IEntity
  
  class SparcEntity(object):
      """A basic Sparc entity"""
      implements(IEntity)
      
      def __init__(self, id_, name, description):
          self._id = id_
          self.name = name
          self.description = description
      
      def getId(self):
          return self._id
      
new_contents: from zope.interface import implements
  from interfaces import IEntity
  
  class SparcEntity(object):
      """A basic Sparc entity"""
      implements(IEntity)
      
      def __init__(self, id, name, description):
          self._id = id
          self.name = name
          self.description = description
      
      def getId(self):
          return self._id
      
subject: update init footprint for SparcEntity