old_contents: #!/usr/bin/python2
  # Copyright 2019 The ANGLE Project Authors. All rights reserved.
  # Use of this source code is governed by a BSD-style license that can be
  # found in the LICENSE file.
  #
  # Simple helper for use in 'gn' files to check if a file exists.
  
  import os, shutil, sys
  
  def main():
  	if len(sys.argv) != 2:
  		print "Usage: %s <path>" % sys.argv[0]
  		sys.exit(1)
  
  	if os.path.exists(sys.argv[1]):
  		print "true"
  	else:
  		print "false"
  	sys.exit(0)
  
  if __name__ == '__main__':
    main()
  
new_contents: #!/usr/bin/python2
  # Copyright 2019 The ANGLE Project Authors. All rights reserved.
  # Use of this source code is governed by a BSD-style license that can be
  # found in the LICENSE file.
  #
  # Simple helper for use in 'gn' files to check if a file exists.
  
  from __future__ import print_function
  
  import os, shutil, sys
  
  def main():
    if len(sys.argv) != 2:
      print("Usage: %s <path>" % sys.argv[0])
      sys.exit(1)
  
    if os.path.exists(sys.argv[1]):
      print("true")
    else:
      print("false")
    sys.exit(0)
  
  if __name__ == '__main__':
    main()
  
subject: Support Python 3 in //scripts/file_exists.py