old_contents: from primative import Direction
  class Wall (object):
      name = ""
      direction = None
  
      def __init__ (self, name, direction):
          assert isinstance(name, str)
          self.name = name.upper()
          assert isinstance(direction, Direction)
          self.direction = direction
new_contents: from .direction import Direction
  class Wall (object):
      name = ""
      direction = None
  
      def __init__ (self, name, direction):
          assert isinstance(name, str)
          self.name = name.upper()
          assert isinstance(direction, Direction)
          self.direction = direction
subject: update import