old_contents: #!/usr/bin/env python2
  '''
  A simple script for passing commands to various media players.
  
  This script needs ``dbus-python`` for spotify communication.
  
  To run simply::
  
      ./mediakeys.py <command>
  
  Where command is one of the following::
  
      ``toggle``
      ``stop``
      ``next``
      ``previous``
  '''
  
  # pylint: disable=W0142,W0703
  
  import dbus
  from dbus.mainloop.glib import DBusGMainLoop
  import sys
  import subprocess
  
  
  def send_spotify(command):
      '''
      Send the command to spotify using dbus iterface.
      '''
      try:
          bus_loop = DBusGMainLoop(set_as_default=True)
          session_bus = dbus.SessionBus(mainloop=bus_loop)
          spotify_bus = session_bus.get_object('org.mpris.MediaPlayer2.spotify',
                                               '/org/mpris/MediaPlayer2')
          spotify = dbus.Interface(spotify_bus, 'org.mpris.MediaPlayer2.Player')
          if command == 'toggle':
              spotify.PlayPause()
          elif command == 'stop':
              spotify.Stop()
          elif command == 'next':
              spotify.Next()
          elif command == 'previous':
              spotify.Previous()
          return True
      except Exception:
          return False
  
  
  def send_ncmpcpp(command):
      '''
      Pass the command to ncmpcpp using a subprocess.
      '''
      cmd = 'ncmpcpp {}'.format(command)
      kwargs = {'shell': True}
      proc = subprocess.Popen(cmd, **kwargs)
      proc.communicate()
      if proc.returncode == 0:
          return True
      return False
  
  
  def main(arg):
      '''
      Pass the arg to media players.
      '''
      if arg in ('toggle', 'stop', 'next', 'previous'):
          # First try sending command to Spotify, then ncmpcpp
          return send_spotify(arg) or send_ncmpcpp(arg)
      return False
  
  
  if __name__ == '__main__':
      if len(sys.argv) == 2:
          if main(sys.argv[1]):
              exit(0)
          else:
              exit(100)
      else:
          exit(101)
  
new_contents: #!/usr/bin/env python2
  '''
  A simple script for passing commands to various media players.
  
  This script needs ``dbus-python`` for spotify communication.
  
  To run simply::
  
      ./mediakeys.py <command>
  
  Where command is one of the following::
  
      ``toggle``
      ``stop``
      ``next``
      ``previous``
  '''
  
  # pylint: disable=W0142,W0703
  
  import dbus
  from dbus.mainloop.glib import DBusGMainLoop
  import sys
  import subprocess
  
  
  def send_spotify(command):
      '''
      Send the command to spotify using dbus iterface.
      '''
      try:
          bus_loop = DBusGMainLoop(set_as_default=True)
          session_bus = dbus.SessionBus(mainloop=bus_loop)
          spotify_bus = session_bus.get_object('org.mpris.MediaPlayer2.spotify',
                                               '/org/mpris/MediaPlayer2')
          spotify = dbus.Interface(spotify_bus, 'org.mpris.MediaPlayer2.Player')
          if command == 'toggle':
              spotify.PlayPause()
          elif command == 'stop':
              spotify.Stop()
          elif command == 'next':
              spotify.Next()
          elif command == 'prev':
              spotify.Previous()
          return True
      except Exception:
          return False
  
  
  def send_ncmpcpp(command):
      '''
      Pass the command to ncmpcpp using a subprocess.
      '''
      cmd = 'ncmpcpp {}'.format(command)
      kwargs = {'shell': True}
      proc = subprocess.Popen(cmd, **kwargs)
      proc.communicate()
      if proc.returncode == 0:
          return True
      return False
  
  
  def main(arg):
      '''
      Pass the arg to media players.
      '''
      if arg in ('toggle', 'stop', 'next', 'prev'):
          # First try sending command to Spotify, then ncmpcpp
          return send_spotify(arg) or send_ncmpcpp(arg)
      return False
  
  
  if __name__ == '__main__':
      if len(sys.argv) == 2:
          if main(sys.argv[1]):
              exit(0)
          else:
              exit(100)
      else:
          exit(101)
  
subject: use correct for prev