def run_graphviz(program, code, options=[], format='png'):
 import os
 from subprocess import Popen, PIPE
 dot_args = (([program] + options) + ['-T', format])
 if (os.name == 'nt'):
  p = Popen(dot_args, stdout=PIPE, stdin=PIPE, stderr=PIPE, creationflags=134217728)
 else:
  p = Popen(dot_args, stdout=PIPE, stdin=PIPE, stderr=PIPE)
  wentwrong = False
 try:
  (stdout, stderr) = p.communicate(code.encode('utf-8'))
 except (OSError, IOError) as err:
  if (err.errno != EPIPE):
   raise
  wentwrong = True
 except IOError as err:
  if (err.errno != EINVAL):
   raise
  wentwrong = True
 if wentwrong:
  (stdout, stderr) = (p.stdout.read(), p.stderr.read())
  p.wait()
 if (p.returncode != 0):
  raise RuntimeError('dot exited with error:\n[stderr]\n{0}'.format(stderr.decode('utf-8')))
 return stdout

def run_graphviz ( program , code , options = [ ] , format = 'png' ) : import os from subprocess import Popen , PIPE dot_args = ( ( [ program ] + options ) + [ '-T' , format ] ) if ( os . name == 'nt' ) : p = Popen ( dot_args , stdout = PIPE , stdin = PIPE , stderr = PIPE , creationflags = 134217728 ) else : p = Popen ( dot_args , stdout = PIPE , stdin = PIPE , stderr = PIPE ) wentwrong = False try : ( stdout , stderr ) = p . communicate ( code . encode ( 'utf-8' ) ) except ( OSError , IOError ) as err : if ( err . errno != EPIPE ) : raise wentwrong = True except IOError as err : if ( err . errno != EINVAL ) : raise wentwrong = True if wentwrong : ( stdout , stderr ) = ( p . stdout . read ( ) , p . stderr . read ( ) ) p . wait ( ) if ( p . returncode != 0 ) : raise RuntimeError ( 'dot exited with error:\n[stderr]\n{0}' . format ( stderr . decode ( 'utf-8' ) ) ) return stdout
runs graphviz programs and returns image data copied from URL .