Source code for cherrypy.tutorial.tut05_derived_objects

Tutorial - Object inheritance

You are free to derive your request handler classes from any base
class you wish. In most real-world applications, you will probably
want to create a central base class used for all your pages, which takes
care of things like printing a common page header and footer.

import os.path

import cherrypy

[docs]class Page: # Store the page title in a class attribute title = 'Untitled Page'
[docs] def header(self): return ''' <html> <head> <title>%s</title> <head> <body> <h2>%s</h2> ''' % (self.title, self.title)
[docs] def footer(self): return ''' </body> </html> '''
# Note that header and footer don't get their exposed attributes # set to True. This isn't necessary since the user isn't supposed # to call header or footer directly; instead, we'll call them from # within the actually exposed handler methods defined in this # class' subclasses.
[docs]class HomePage(Page): # Different title for this page title = 'Tutorial 5' def __init__(self): # create a subpage self.another = AnotherPage()
[docs] @cherrypy.expose def index(self): # Note that we call the header and footer methods inherited # from the Page class! return self.header() + ''' <p> Isn't this exciting? There's <a href="./another/">another page</a>, too! </p> ''' + self.footer()
[docs]class AnotherPage(Page): title = 'Another Page'
[docs] @cherrypy.expose def index(self): return self.header() + ''' <p> And this is the amazing second page! </p> ''' + self.footer()
tutconf = os.path.join(os.path.dirname(__file__), 'tutorial.conf') if __name__ == '__main__': # CherryPy always starts with app.root when trying to map request URIs # to objects, so we need to mount a request handler root. A request # to '/' will be mapped to HelloWorld().index(). cherrypy.quickstart(HomePage(), config=tutconf)