Tornado: how to dispatch different requests to a same class

Question

I'm using Tornado to build a web server. I need to dispatch different requests into a same class. Here is an example:

application.add_handlers(r"^(example).*", [
(r"/(mark)/(auth)"), MarkHandler,
(r"/(mark)"), MarkHandler,
])

And the class MarkHandler:

class MarkHandler(tornado.web.RequestHandler):
    def get(self, mark):   # /(mark)
        print('1111')

    def get(self, mark, auth):    # /(mark)/(auth)
        print('2222')

However, it doesn't seem to work...
When I visit the link: www.example.com/mark, the server gives me an error:

TypeError: get() missing 1 required positional argument: 'auth'

What I need as above is impossible?

Answer 1

Python doesn't allow method overloading the way C++ or Java does. Defining the same method get twice in Python simply overwrites the first method with the second one.

Instead, you want a default value for the second argument:

class MarkHandler(tornado.web.RequestHandler):
    def get(self, mark, auth=None):
        if auth is not None:
            print('2222')
        else:
            print('1111')