Python + Tornado - Variable length URL Parameters

If you want to catch variable length url parameters with tornado, first, you have to setup the correct regex routes:

(r"/some_method/?(?P<param_name>[A-Za-z0-9-]+)?/", FunctionHandler)

Don't forget to enclose the param groups (?P ... ) between question marks ?(?P ... )? to mark them as non-mendatory.

The function handler is like:

class FunctionHandler(tornado.web.RequestHandler):
    def get(self, **params):
        self.render("some_template_file.html",
            params          = params,
    )

You'll be able to use the parameters variable in your template as follow:

params["param_name"]