old_contents: 
  class Constants(object):
  
      class ConstError(TypeError):
          pass
  
      def __init__(self, **kwargs):
          for name, value in list(kwargs.items()):
              super(Constants, self).__setattr__(name, value)
  
      def __setattr__(self, name, value):
          if name in self.__dist__:
              raise self.ConstError("Can't rebind const(%s)" % name)
          self.__dict__[name] = value
  
      def __delattr__(self, name):
          if name in self.__dict__:
              raise self.ConstError("Can't unbind const(%s)" % name)
          raise NameError(name)
  
  
  Tables = Constants(
      BOXES="boxes"
  )
  
  DefaultEngineBox = 'turbulent/substance-box:0.7'
  
  EngineStates = Constants(
      RUNNING="running",
      STOPPED="stopped",
      SUSPENDED="suspended",
      UNKNOWN="unknown",
      INEXISTENT="inexistent"
  )
  
  Syncher = Constants(
      UP=">>",
      DOWN="<<",
      BOTH="<>"
  )
  
new_contents: 
  class Constants(object):
  
      class ConstError(TypeError):
          pass
  
      def __init__(self, **kwargs):
          for name, value in list(kwargs.items()):
              super(Constants, self).__setattr__(name, value)
  
      def __setattr__(self, name, value):
          if name in self.__dist__:
              raise self.ConstError("Can't rebind const(%s)" % name)
          self.__dict__[name] = value
  
      def __delattr__(self, name):
          if name in self.__dict__:
              raise self.ConstError("Can't unbind const(%s)" % name)
          raise NameError(name)
  
  
  Tables = Constants(
      BOXES="boxes"
  )
  
  DefaultEngineBox = 'turbulent/substance-box:1.0'
  
  EngineStates = Constants(
      RUNNING="running",
      STOPPED="stopped",
      SUSPENDED="suspended",
      UNKNOWN="unknown",
      INEXISTENT="inexistent"
  )
  
  Syncher = Constants(
      UP=">>",
      DOWN="<<",
      BOTH="<>"
  )
  
subject: use substance-box 1.0 as default box