code: def mount(self, url, app):
          "Mount a sub-app at the url of current app."
          # Inspired by Bottle. It might seem that dispatching to
          # subapps would rather be handled by normal routes, but
          # arguably, that's less efficient. Taking into account
          # that paradigmatically there's difference between handing
          # an action and delegating responisibilities to another
          # app, Bottle's way was followed.
          app.url = url
          self.mounts.append(appf mount(self, url, app):
          "Mount a sub-app at the url of current app."
          # Inspired by Bottle. It might seem that dispatching to
          # subapps would rather be handled by normal routes, but
          # arguably, that's less efficient. Taking into account
          # that paradigmatically there's difference between handing
          # an action and delegating responisibilities to another
          # app, Bottle's way was followed.
          app.url = url
          self.mounts.append(app)
docs: Mount a sub-app at the url of current app.