new_contents: from __future__ import absolute_import, division, print_function, unicode_literals
  
  import lib.sys
  
  def cut(source, dest, start, end):
  	lib.sys.call([
  		"pdftk",
  		"A=%s" % source,
  		"cat",
  		"A%d-%d" % (start, end),
  		"output",
  		dest
  	], stddefault = None)
  
  
  def burst(source):
  	lib.sys.call([
  		"pdftk",
  		source,
  		"burst"
  	], stddefault = None)
  
  def svg(source):
  	lib.sys.call([
  		"pdftocairo",
  		"-svg",
  		source
  	], stddefault = None)
subject: fix #8