By Sylvain Hellegouarch
ISBN-10: 1904811841
ISBN-13: 9781904811848
CherryPy is a Python library for net improvement that enables builders to construct internet purposes within the similar means as the other object-oriented Python application. Enriched through numerous years of lively improvement, it has develop into essentially the most tested toolkits for development sturdy and high-performance internet 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 supplying the main complex good points to fluent Python builders. For those purposes CherryPy was once selected to be on the center of the preferred and feature-rich TurboGears internet framework. CherryPy-powered internet purposes are stand-alone Python functions with their very own embedded multi-threaded net server, yet may also run at the back of Apache or IIS for scalability.
This publication covers the CherryPy library for Python internet improvement from its background and deploy via its major positive factors and middle suggestions to its integration with Python and different items to build, try, and installation a pattern photoblog program. the writer Sylvain Hellegouarch is devoted to the improvement of loose software program initiatives and has been coordinating and administrating the group efforts round the CherryPy undertaking considering that 2004. The method according to an instance software introduces many different universal Python libraries, supplying transferable abilities additionally suitable for non-web Python initiatives.
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Extra resources for CherryPy Essentials: Rapid Python Web Application Development
Example text
Keyword Definition Web server A web server is the interface dealing with the HTTP protocol. Its goal is to transform incoming HTTP requests into entities that are then passed to the application server and also transform information from the application server back into HTTP responses. Application An application is a piece of software that takes a unit of information, applies business logic to it, and returns a processed unit of information. Application server An application server is the component hosting one or more applications.
Encode(encoding='ISO 8859-1') def index(self) return "Et voilà" • Making a library call with a higher-level interface Tools can be applied as regular Python callable objects. callable(media='text/html') [ 43 ] Overview of CherryPy The previous line shows how to call the accept tool that looks up the provided media type within the requested Accept HTTP header. Thanks to that unified interface it is possible to modify the underlying code of the tool without having to modify the application level itself.
In spite of that, a user can navigate an e-commerce website with the impression that the application more or less follows the way he or she would call the store to pass an order. The session mechanism was therefore brought to the Web to allow servers to keep track of users' information. CherryPy's session module offers a straightforward interface to the application developer to store, retrieve, amend, and delete chunks of data from a session object. CherryPy comes natively with three different back-end storages for session objects: Back-end type Advantages Drawbacks RAM Efficient Information lost when server is shutdown Accepts any type of objects File system Relational database (PostgreSQL built-in support) No configuration needed Memory consumption can grow fast Persistence of the information File system locking can be inefficient Simple setup Only serializable (via the pickle module) objects can be stored Persistence of the information Only serializable objects can be stored Robust Setup less straightforward Scalable Can be load balanced The advantage is that your application will use a high-level interface independent of the underlying back end.