old_contents: # Date: August 2017
  # Author: Kutay B. Sezginel
  """
  Thermal conductivity calculations of porous crystals using Lammps
  """
  from .simulation import Simulation
  
new_contents: # Date: August 2017
  # Author: Kutay B. Sezginel
  """
  Thermal conductivity calculations of porous crystals using Lammps
  """
  
subject: Remove simulation import in __init__.py