old_contents: #!/usr/bin/env python
  
  import os, sys, subprocess
  
  if __name__ == '__main__':
      # check for root
      if not os.geteuid()==0:
          sys.exit('You need to run this as root')
  
      # paths
      path_torrc_additions = '/home/amnesia/Persistent/.securedrop/torrc_additions'
      path_torrc_backup = '/etc/tor/torrc.bak'
      path_torrc = '/etc/tor/torrc'
  
      # load torrc_additions
      if os.path.isfile(path_torrc_additions):
          torrc_additions = open(path_torrc_additions).read()
      else:
          sys.exit('Error opening {0} for reading'.format(path_torrc_additions))
  
      # load torrc
      if os.path.isfile(path_torrc_backup):
          torrc = open(path_torrc_backup).read()
      else:
          if os.path.isfile(path_torrc):
              torrc = open(path_torrc).read()
          else:
              sys.exit('Error opening {0} for reading'.format(path_torrc))
  
          # save a backup
          open(path_torrc_backup, 'w').write(torrc)
  
      # append the additions
      open(path_torrc, 'w').write(torrc+torrc_additions)
  
      # reload tor
      subprocess.call(['/usr/sbin/service', 'tor', 'reload'])
  
      # success
      subprocess.call(['/usr/bin/sudo', '-u', 'amnesia', '/usr/bin/notify-send', 'Updated torrc', 'You can now connect to your SecureDrop\ndocument interface'])
  
new_contents: #!/usr/bin/env python
  
  import os
  import sys
  import subprocess
  
  
  if __name__ == '__main__':
      # check for root
      if os.geteuid() != 0:
          sys.exit('You need to run this as root')
  
      # paths
      path_torrc_additions = '/home/amnesia/Persistent/.securedrop/torrc_additions'
      path_torrc_backup = '/etc/tor/torrc.bak'
      path_torrc = '/etc/tor/torrc'
  
      # load torrc_additions
      if os.path.isfile(path_torrc_additions):
          torrc_additions = open(path_torrc_additions).read()
      else:
          sys.exit('Error opening {0} for reading'.format(path_torrc_additions))
  
      # load torrc
      if os.path.isfile(path_torrc_backup):
          torrc = open(path_torrc_backup).read()
      else:
          if os.path.isfile(path_torrc):
              torrc = open(path_torrc).read()
          else:
              sys.exit('Error opening {0} for reading'.format(path_torrc))
  
          # save a backup
          open(path_torrc_backup, 'w').write(torrc)
  
      # append the additions
      open(path_torrc, 'w').write(torrc + torrc_additions)
  
      # reload tor
      subprocess.call(['/usr/sbin/service', 'tor', 'reload'])
  
      # success
      subprocess.call(['/usr/bin/sudo', '-u', 'amnesia', '/usr/bin/notify-send', 'Updated torrc', 'You can now connect to your SecureDrop\ndocument interface'])
  
subject: fix lots of pep8 and other minor issues - only cosmetics, no functional change