CSC/ECE 517 Fall 2014/ch1a 3 zq

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CherryPy Framework

CherryPy is a python based, object-oriented web framework that enables developers to quickly create lightweight and fast web applications.<ref>http://www.cherrypy.org/</ref><ref>http://en.wikipedia.org/wiki/CherryPy</ref>

Some of the popular websites using it are Hulu<ref>http://tech.hulu.com/blog/2013/03/13/python-and-hulu/</ref> and Netflix<ref>http://techblog.netflix.com/2013/03/python-at-netflix.html</ref>. The full list of applications using it can be found here.<ref>http://docs.cherrypy.org/en/latest/intro.html#websites-running-atop-cherrypy</ref>

Background

Basic Example

The following code demonstrates the most basic webserver using the CherryPy framework.

import cherrypy

class WebApp(object):
    @cherrypy.expose
    def index(self):
        return "Hello, CherryPy!"
   
cherrypy.quickstart(WebApp())

Run the application, and open your web browser to localhost:8080. The following page is displayed

Features

Hosting one or multiple applications

Logging

CherryPy provides the following method for application logging

cherrypy.log("Hello, CherryPy!")

By default, all logging is written to the console. The configuration keys log.access_file and log.error_file are also available for writing logging and errors to a text file.

Query Strings

CherryPy will automatically parse the query string of a URL. Fields are passed as method arguments with matching names, and can take advantage of default argument values.

import cherrypy

class WebApp(object):
    @cherrypy.expose
    def test(self, value=1):
        return "Value = " + str(value)
   
cherrypy.quickstart(WebApp())

A URL of localhost:8080/test?value=5 gives the following

Cookies

Sessions

Serve Static Content

Ajax Support

Publish REST APIs

Multiple HTTP Servers

Test Suite

References

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