old_contents: """Run Python's test suite in a fast, rigorous way.
  
  The defaults are meant to be reasonably thorough, while skipping certain
  tests that can be time-consuming or resource-intensive (e.g. largefile),
  or distracting (e.g. audio and gui). These defaults can be overridden by
  simply passing a -u option to this script.
  
  """
  
  import os
  import sys
  import test.support
  
  
  def is_multiprocess_flag(arg):
      return arg.startswith('-j') or arg.startswith('--multiprocess')
  
  
  def is_resource_use_flag(arg):
      return arg.startswith('-u') or arg.startswith('--use')
  
  
  def main(regrtest_args):
      args = [sys.executable,
              '-W', 'default',      # Warnings set to 'default'
              '-bb',                # Warnings about bytes/bytearray
              '-E',                 # Ignore environment variables
              ]
      # Allow user-specified interpreter options to override our defaults.
      args.extend(test.support.args_from_interpreter_flags())
      args.extend(['-m', 'test',    # Run the test suite
                   '-r',            # Randomize test order
                   '-w',            # Re-run failed tests in verbose mode
                   ])
      if not any(is_multiprocess_flag(arg) for arg in regrtest_args):
          args.extend(['-j', '0'])  # Use all CPU cores
      if not any(is_resource_use_flag(arg) for arg in regrtest_args):
          args.extend(['-u', 'all,-largefile,-audio,-gui'])
      args.extend(regrtest_args)
      print(' '.join(args))
      os.execv(sys.executable, args)
  
  
  if __name__ == '__main__':
      main(sys.argv[1:])
  
new_contents: """Run Python's test suite in a fast, rigorous way.
  
  The defaults are meant to be reasonably thorough, while skipping certain
  tests that can be time-consuming or resource-intensive (e.g. largefile),
  or distracting (e.g. audio and gui). These defaults can be overridden by
  simply passing a -u option to this script.
  
  """
  
  import os
  import sys
  import test.support
  
  
  def is_multiprocess_flag(arg):
      return arg.startswith('-j') or arg.startswith('--multiprocess')
  
  
  def is_resource_use_flag(arg):
      return arg.startswith('-u') or arg.startswith('--use')
  
  
  def main(regrtest_args):
      args = [sys.executable,
              '-W', 'default',      # Warnings set to 'default'
              '-bb',                # Warnings about bytes/bytearray
              '-E',                 # Ignore environment variables
              ]
      # Allow user-specified interpreter options to override our defaults.
      args.extend(test.support.args_from_interpreter_flags())
      args.extend(['-m', 'test',    # Run the test suite
                   '-r',            # Randomize test order
                   '-w',            # Re-run failed tests in verbose mode
                   ])
      if sys.platform == 'win32':
          args.append('-n')         # Silence alerts under Windows
      if not any(is_multiprocess_flag(arg) for arg in regrtest_args):
          args.extend(['-j', '0'])  # Use all CPU cores
      if not any(is_resource_use_flag(arg) for arg in regrtest_args):
          args.extend(['-u', 'all,-largefile,-audio,-gui'])
      args.extend(regrtest_args)
      print(' '.join(args))
      os.execv(sys.executable, args)
  
  
  if __name__ == '__main__':
      main(sys.argv[1:])
  
subject: Use -n for tests under Windows