old_contents: from __future__ import division, print_function, absolute_import
  
  from . import boreholes
  from . import gfunction
  from . import heat_transfer
  from . import pipes
  
new_contents: from __future__ import division, print_function, absolute_import
  
  from . import boreholes
  from . import gfunction
  from . import heat_transfer
  from . import load_aggregation
  from . import pipes
  
subject: Load load_aggregation in __init__