def _present_graph(dot_filename, filename=None):
 if (filename == dot_filename):
  return
 if ((not filename) and _program_in_path('xdot')):
  print 'Spawning graph viewer (xdot)'
  subprocess.Popen(['xdot', dot_filename], close_fds=True)
 elif _program_in_path('dot'):
  if (not filename):
   print 'Graph viewer (xdot) not found, generating a png instead'
   filename = (dot_filename[:(-4)] + '.png')
  (stem, ext) = os.path.splitext(filename)
  cmd = ['dot', ('-T' + ext[1:]), ('-o' + filename), dot_filename]
  dot = subprocess.Popen(cmd, close_fds=False)
  dot.wait()
  if (dot.returncode != 0):
   print ('dot failed (exit code %d) while executing "%s"' % (dot.returncode, ' '.join(cmd)))
  else:
   print ('Image generated as %s' % filename)
 elif (not filename):
  print 'Graph viewer (xdot) and image renderer (dot) not found, not doing anything else'
 else:
  print 'Image renderer (dot) not found, not doing anything else'

def _present_graph ( dot_filename , filename = None ) : if ( filename == dot_filename ) : return if ( ( not filename ) and _program_in_path ( 'xdot' ) ) : print 'Spawning graph viewer (xdot)' subprocess . Popen ( [ 'xdot' , dot_filename ] , close_fds = True ) elif _program_in_path ( 'dot' ) : if ( not filename ) : print 'Graph viewer (xdot) not found, generating a png instead' filename = ( dot_filename [ : ( - 4 ) ] + '.png' ) ( stem , ext ) = os . path . splitext ( filename ) cmd = [ 'dot' , ( '-T' + ext [ 1 : ] ) , ( '-o' + filename ) , dot_filename ] dot = subprocess . Popen ( cmd , close_fds = False ) dot . wait ( ) if ( dot . returncode != 0 ) : print ( 'dot failed (exit code %d) while executing "%s"' % ( dot . returncode , ' ' . join ( cmd ) ) ) else : print ( 'Image generated as %s' % filename ) elif ( not filename ) : print 'Graph viewer (xdot) and image renderer (dot) not found, not doing anything else' else : print 'Image renderer (dot) not found, not doing anything else'
present a .