old_contents: import os, os.path
  try:
      import configparser
  except:
      from six.moves import configparser
  _APY_LOADED= True
  try:
      from astropy import units
  except ImportError:
      _APY_LOADED= False
  # The default configuration
  default_configuration= {'astropy-units':'False',
                          'ro':'8.',
                          'vo':'220.'}
  default_filename= os.path.join(os.path.expanduser('~'),'.galpyrc')
  def write_default(filename):
      writeconfig= configparser.ConfigParser()
      # Write different sections
      writeconfig.add_section('normalization')
      writeconfig.set('normalization','ro',
                      default_configuration['ro'])
      writeconfig.set('normalization','vo',
                      default_configuration['vo'])
      writeconfig.add_section('astropy')
      writeconfig.set('astropy','astropy-units',
                      default_configuration['astropy-units'])
      with open(filename,'w') as configfile:
          writeconfig.write(configfile)
      return None
  
  # Read the configuration file
  __config__= configparser.ConfigParser(default_configuration)
  if __config__.read([default_filename,'.galpyrc']) == []:
      write_default(default_filename)
      __config__.read(default_filename)
  
  # Set configuration variables on the fly
  def set_ro(ro):
      """
      NAME:
         set_ro
      PURPOSE:
         set the global configuration value of ro (distance scale)
      INPUT:
         ro - scale in kpc or astropy Quantity
      OUTPUT:
         (none)
      HISTORY:
         2016-01-05 - Written - Bovy (UofT)
      """
      if _APY_LOADED and isinstance(ro,units.Quantity):
          ro= ro.to(units.kpc).value
      __config__.set('normalization','ro',str(ro))
  
  def set_vo(vo):
      """
      NAME:
         set_vo
      PURPOSE:
         set the global configuration value of vo (velocity scale)
      INPUT:
         vo - scale in km/s or astropy Quantity
      OUTPUT:
         (none)
      HISTORY:
         2016-01-05 - Written - Bovy (UofT)
      """
      if _APY_LOADED and isinstance(vo,units.Quantity):
          vo= vo.to(units.km/units.s).value
      __config__.set('normalization','vo',str(vo))
  
new_contents: import os, os.path
  try:
      import configparser
  except:
      from six.moves import configparser
  _APY_LOADED= True
  try:
      from astropy import units
  except ImportError:
      _APY_LOADED= False
  # The default configuration
  default_configuration= {'astropy-units':'False',
                          'astropy-coords':'True',
                          'ro':'8.',
                          'vo':'220.'}
  default_filename= os.path.join(os.path.expanduser('~'),'.galpyrc')
  def write_default(filename):
      writeconfig= configparser.ConfigParser()
      # Write different sections
      writeconfig.add_section('normalization')
      writeconfig.set('normalization','ro',
                      default_configuration['ro'])
      writeconfig.set('normalization','vo',
                      default_configuration['vo'])
      writeconfig.add_section('astropy')
      writeconfig.set('astropy','astropy-units',
                      default_configuration['astropy-units'])
      writeconfig.set('astropy','astropy-coords',
                      default_configuration['astropy-coords'])
      with open(filename,'w') as configfile:
          writeconfig.write(configfile)
      return None
  
  # Read the configuration file
  __config__= configparser.ConfigParser(default_configuration)
  if __config__.read([default_filename,'.galpyrc']) == []:
      write_default(default_filename)
      __config__.read(default_filename)
  
  # Set configuration variables on the fly
  def set_ro(ro):
      """
      NAME:
         set_ro
      PURPOSE:
         set the global configuration value of ro (distance scale)
      INPUT:
         ro - scale in kpc or astropy Quantity
      OUTPUT:
         (none)
      HISTORY:
         2016-01-05 - Written - Bovy (UofT)
      """
      if _APY_LOADED and isinstance(ro,units.Quantity):
          ro= ro.to(units.kpc).value
      __config__.set('normalization','ro',str(ro))
  
  def set_vo(vo):
      """
      NAME:
         set_vo
      PURPOSE:
         set the global configuration value of vo (velocity scale)
      INPUT:
         vo - scale in km/s or astropy Quantity
      OUTPUT:
         (none)
      HISTORY:
         2016-01-05 - Written - Bovy (UofT)
      """
      if _APY_LOADED and isinstance(vo,units.Quantity):
          vo= vo.to(units.km/units.s).value
      __config__.set('normalization','vo',str(vo))
  
subject: Add configuration parameter whether or not to use astropy's coordinate transformations where relevant