code: def _usage(shorthelp):
      
      doc = _sys.modules['__main__'].__doc__
      if not doc:
          doc = '\nUSAGE: %s [flags]\n' % _sys.argv[0]
          doc = flags.text_wrap(doc, indent='       ', firstline_indent='')
      else:
          # Replace all '%s' with sys.argv[0], and all '%%' with '%'.
          num_specifiers = doc.count('%') - 2 * doc.count('%%')
          try:
              doc %= (_sys.argv[0],) * num_specifiers
          except (OverflowError, TypeError, ValueError):
              # Just display the docstring as-is.
              pass
      if shorthelp:
          flag_str = flags.FLAGS.main_module_help()
      else:
          flag_str = str(flags.FLAGS)
      try:
          _sys.stdout.write(doc)
          if flag_str:
              _sys.stdout.write('\nflags:\n')
              _sys.stdout.write(flag_str)
          _sys.stdout.write('\n')
      except IOError as e:
          # We avoid printing a huge backtrace if we get EPIPE, because
          # "foo.par --help | less" is a frequent use case.
          if e.errno != _errno.EPIPE:
              raise
docs: Writes __main__'s docstring to stdout with some help text.
  
      Args:
        shorthelp: bool, if True, prints only flags from the main module,
            rather than all flags.