old_contents: """Math functions, physical constants and auxiliary functions."""
  
  
  # TODO: update subpackage with 2019 redefinition of SI base units and consts!
  # see https://en.wikipedia.org/wiki/2019_redefinition_of_SI_base_units
  
  import os as _os
  
  from . import base_units
  from . import units
  from . import constants
  from . import functions
  from . import beam_optics
  
  __all__ = [
      'base_units', 'units', 'constants', 'functions', 'beam_optics']
  
  with open(_os.path.join(__path__[0], 'VERSION'), 'r') as _f:
      __version__ = _f.read().strip()
  
new_contents: """Math functions, physical constants and auxiliary functions."""
  
  
  # TODO: update subpackage with 2019 redefinition of SI base units and consts!
  # see https://en.wikipedia.org/wiki/2019_redefinition_of_SI_base_units
  
  import os as _os
  
  from . import base_units
  from . import units
  from . import constants
  from . import functions
  from . import beam_optics
  
  __all__ = ['base_units', 'units', 'constants', 'functions', 'beam_optics']
  
  with open(_os.path.join(__path__[0], 'VERSION'), 'r') as _f:
      __version__ = _f.read().strip()
  
subject: fix style of __Init__ method.