By Sylvain Hellegouarch

CherryPy is a Python library for internet improvement that permits builders to construct net functions within the related means as the other object-oriented Python application. Enriched through a number of years of lively improvement, it has turn into essentially the most verified toolkits for development reliable and high-performance net functions in Python. CherryPy abstracts the advanced low-level HTTP protocol into an easy-to-use interface that respects Python idioms. The library goals at being basic to benefit for a newbie whereas delivering the main complex beneficial properties to fluent Python builders. For those purposes CherryPy was once selected to be on the middle of the preferred and feature-rich TurboGears internet framework. CherryPy-powered internet purposes are stand-alone Python purposes with their very own embedded multi-threaded net server, yet may also run in the back of Apache or IIS for scalability.

This booklet covers the CherryPy library for Python internet improvement from its historical past and install via its major positive aspects and center options to its integration with Python and different items to build, try out, and installation a pattern photoblog software. the writer Sylvain Hellegouarch is devoted to the improvement of loose software program initiatives and has been coordinating and administrating the neighborhood efforts round the CherryPy venture in view that 2004. The procedure in accordance with an instance program introduces many different universal Python libraries, delivering transferable abilities additionally appropriate for non-web Python initiatives.

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Quickstart() Internal Engine The CherryPy engine is the layer in charge of the following: • • Creating and managing Request and Response objects ° The Request is in charge of retrieving and calling the page handler matching the Request-URI. ° The Response object constructs and validates the response before handing it back to the underlying server. start() [ 32 ] Chapter 3 Configuration CherryPy comes with its own configuration system allowing you to parameterize the HTTP server as well as the behavior of the CherryPy engine when processing a Request-URI.

This means that from your page handler you may raise a Python error or exception as in any other Python application. CherryPy will catch those and transform them into HTTP messages depending on the type of errors. Note that when an exception is raised and not caught by any other part of the application, CherryPy will return the corresponding HTTP 500 error code. For example, the following example will show the default behavior of CherryPy. quickstart(Root(), '/') [ 44 ] Chapter 3 As you can see CherryPy displays the complete traceback of the Python error.

The Caching Module Caching is an important side of any web application as it reduces the load and stress of the different servers in action—HTTP, application, and database servers. In spite of being highly correlated to the application itself, generic caching tools such as the ones provided by this module can help in achieving decent improvements in your application's performance. The CherryPy caching module works at the HTTP server level in the sense that it will cache the generated output to be sent to the user agent and will retrieve a cached resource based on a predefined key, which defaults to the complete URL leading to that resource.

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