old_contents: #!/usr/bin/env python
  
  from __future__ import print_function
  import cfl
  import sys
  
  # from http://stackoverflow.com/questions/5574702/how-to-print-to-stderr-in-python
  def errprint(*args, **kwargs):
  	    print(*args, file=sys.stderr, **kwargs)
  
  def main(out_name, in_name):
  	input = cfl.readmulticfl(in_name)
  	#cfl.writecfl(input, out_name)
  	cfl.writemulticfl(out_name, input)
  	return 0
  
  if __name__ == '__main__':
  
  	if len(sys.argv) != 3:
  		errprint('Usage:', sys.argv[0], '<input> <output>')
  
  	exit(main(sys.argv[2], sys.argv[1]))
  
new_contents: #!/usr/bin/env python3
  
  import cfl
  import sys
  
  # from http://stackoverflow.com/questions/5574702/how-to-print-to-stderr-in-python
  def errprint(*args, **kwargs):
  	    print(*args, file=sys.stderr, **kwargs)
  
  def main(out_name, in_name):
  	input = cfl.readmulticfl(in_name)
  	#cfl.writecfl(input, out_name)
  	cfl.writemulticfl(out_name, input)
  	return 0
  
  if __name__ == '__main__':
  
  	if len(sys.argv) != 3:
  		errprint('Usage:', sys.argv[0], '<input> <output>')
  
  	exit(main(sys.argv[2], sys.argv[1]))
  
subject: fix python->python3