old_contents: #!/usr/bin/python
  import optparse
  import sys
  # Install the Python unittest2 package before you run this script.
  import unittest2
  
  USAGE = """%prog SDK_PATH
  Run unit tests for App Engine apps.
  The SDK Path is probably /usr/local/google_appengine on Mac OS
  
  SDK_PATH    Path to the SDK installation"""
  
  
  def main(sdk_path, test_pattern):
      sys.path.insert(0, sdk_path)
      import dev_appserver
      dev_appserver.fix_sys_path()
  
      suite = unittest2.loader.TestLoader().discover("tests", test_pattern)
      tests = unittest2.TextTestRunner(verbosity=2).run(suite)
  
      if tests.wasSuccessful() == True:
          sys.exit(0)
      else:
          sys.exit(1)
  
  
  if __name__ == '__main__':
      parser = optparse.OptionParser(USAGE)
      options, args = parser.parse_args()
      if len(args) < 1:
          print 'Warning: Trying default SDK path.'
          sdk_path = "/usr/local/google_appengine"
      else:
          sdk_path = args[0]
  
      test_pattern = "test*.py"
      if len(args) > 1:
          test_pattern = args[1]
  
      main(sdk_path, test_pattern)
new_contents: #!/usr/bin/python
  import optparse
  import sys
  import warnings
  
  # Install the Python unittest2 package before you run this script.
  import unittest2
  
  USAGE = """%prog SDK_PATH
  Run unit tests for App Engine apps.
  The SDK Path is probably /usr/local/google_appengine on Mac OS
  
  SDK_PATH    Path to the SDK installation"""
  
  
  def main(sdk_path, test_pattern):
      sys.path.insert(0, sdk_path)
      import dev_appserver
      dev_appserver.fix_sys_path()
  
      suite = unittest2.loader.TestLoader().discover("tests", test_pattern)
      tests = unittest2.TextTestRunner(verbosity=2).run(suite)
  
      if tests.wasSuccessful() == True:
          sys.exit(0)
      else:
          sys.exit(1)
  
  
  if __name__ == '__main__':
      parser = optparse.OptionParser(USAGE)
      options, args = parser.parse_args()
      if len(args) < 1:
          warnings.warn('Trying default SDK path.', RuntimeWarning)
          sdk_path = "/usr/local/google_appengine"
      else:
          sdk_path = args[0]
  
      test_pattern = "test*.py"
      if len(args) > 1:
          test_pattern = args[1]
  
      main(sdk_path, test_pattern)
subject: Replace print statement with `warnings.warn`.