13.1 Example: Hello World

Let’s see a basic usage of the framework:

    # Import from itools
    from itools.web import Server, Root

    class MyRoot(Root):

        GET__access__ = True
        def GET(self, context):
            return 'Hello World'


    if __name__ == '__main__':
        root = MyRoot()
        server = Server(root)
        server.start()

To test the code above, type:

    $ python hello.py

Then open a browser and go to http://localhost:8080 to see the famous sentence.

These few lines of code expose several aspects of itools.web that we will see later with more detail:

• The class Server implements a Web server. It expects the root of your application as the first parameter.

• The root of the application must be an instance of Root. You subclass it to write your own application.

• The method GET will be called for HTTP GET requests.

• We have to open access to this method with GET__access__, because by default everything is closed.

• The GET method expects the context as a parameter. The context object is the primary programming interface.

• The GET method returns the string that will be sent to the browser.