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that options may be defined in any module (it also enables
`tornado.log` by default). The rest of Tornado does not depend on this
module, so feel free to use `argparse` or other configuration
libraries if you prefer them.

Options must be defined with `tornado.options.define` before use,
generally at the top level of a module. The options are then
accessible as attributes of `tornado.options.options`::

    # myapp/db.py
    from tornado.options import define, options

    define("mysql_host", default="127.0.0.1:3306", help="Main user DB")
    define("memcache_hosts", default="127.0.0.1:11011", multiple=True,
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        db = database.Connection(options.mysql_host)
        ...

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    from tornado.options import define, options

    define("port", default=8080, help="port to listen on")

    def start_server():
        app = make_app()
        app.listen(options.port)

The ``main()`` method of your application does not need to be aware of all of
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when the modules are loaded.  However, all modules that define options
must have been imported before the command line is parsed.

Your ``main()`` method can parse the command line or parse a config file with
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    import tornado.options

    if __name__ == '__main__':
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        # or
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.. note::

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`tornado.options.options` is a singleton instance of `OptionParser`, and
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.. note::

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       options.logging = None
       parse_command_line()

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