old_contents: # -*- coding=utf-8 -*-
  from __future__ import absolute_import, print_function, unicode_literals
  
  from .errors import ChemharpException, ArgumentError
  from .atom import Atom
  from .topology import Topology
  from .cell import UnitCell, OrthorombicCell, TriclinicCell, InfiniteCell
  from .frame import Frame
  from .trajectory import Trajectory
  
new_contents: # -*- coding=utf-8 -*-
  from __future__ import absolute_import, print_function, unicode_literals
  
  __version__ = "0.3.1"
  
  from .errors import ChemharpException, ArgumentError
  from .atom import Atom
  from .topology import Topology
  from .cell import UnitCell, OrthorombicCell, TriclinicCell, InfiniteCell
  from .frame import Frame
  from .trajectory import Trajectory
  
subject: Add version attribute