old_contents: #-----------------------------------------------------------------------------
  # Copyright (C) 2012 The IPython Development Team
  #
  # Distributed under the terms of the BSD License. The full license is in
  # the file COPYING, distributed as part of this software.
  #-----------------------------------------------------------------------------
  
  """
  Copy data from input file to output file for testing.
  """
  
  import sys
  from IPython.utils.py3compat import PY3
  (inpath, outpath) = sys.argv[1:]
  
  if inpath == '-':
      if PY3:
          infile = sys.stdin.buffer
      else:
          infile = sys.stdin
  else:
      infile = open(inpath, 'rb')
  
  open(outpath, 'w+b').write(infile.read())
  
new_contents: #-----------------------------------------------------------------------------
  # Copyright (C) 2012 The IPython Development Team
  #
  # Distributed under the terms of the BSD License. The full license is in
  # the file COPYING, distributed as part of this software.
  #-----------------------------------------------------------------------------
  
  """
  Copy data from input file to output file for testing.
  
  Command line usage:
  
      python writetofile.py INPUT OUTPUT
  
  Binary data from INPUT file is copied to OUTPUT file.
  If INPUT is '-', stdin is used.
  
  """
  
  import sys
  from IPython.utils.py3compat import PY3
  (inpath, outpath) = sys.argv[1:]
  
  if inpath == '-':
      if PY3:
          infile = sys.stdin.buffer
      else:
          infile = sys.stdin
  else:
      infile = open(inpath, 'rb')
  
  open(outpath, 'w+b').write(infile.read())
  
subject: Document tests/writetofile.py bit more