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Python Paste

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This is an old revision of this page, as edited by Infobag (talk | contribs) at 20:04, 4 May 2010 (→WSGI middleware: added link to unix pipes). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
Paste
Developer(s)Ian Bicking
Initial releaseError: All values must be integers (help)
Stable release
1.7.2 / ?
Repository
Written inPython
Operating systemCross-platform
TypeWeb application framework
LicenseMIT License
Websitehttp://www.pythonpaste.org/

Python Paste, often simply called paste, is a set of utilities for web development in Python. Paste has been described as "a framework for web frameworks"[1].

WSGI middleware

To understand the function of paste it is first necessary to understand WSGI middleware.

The WSGI standard is an interface that allows applications to use Python code to handle HTTP requests. A WSGI application is passed a Python representation of an HTTP request by an application, and is returned content which will normally eventually be rendered by a web browser. A common use for this is when a web server serves content created by Python code.

There are, however, other uses: WSGI middleware is Python code that receives a WSGI request and then performs logic based upon this request, before passing the request on to a WSGI application or more WSGI middleware. WSGI middleware appears to an application as a server, and to the server as an application. This is analogous to the function of pipes on Unix systems. Functionality provided by WSGI middleware may include authentication, logging, url redirection, creation of sessions, and compression.

Python paste

The Python Paste package mainly provides Python modules to act as middleware. In addition to middleware, it provides a simple Python webserver that can produce WSGI request and a wrapper used to pass WSGI requests to CGI applications. Paste may be understood as a set of libraries making use of the WSGI standard to provide functionality other than the direct creation of content. This is useful when one is deploying applications written in a Python web framework.

Uses of Paste

Paste is a component used in the Pylons web application framework. Paste has been a long-running open source project, dating from at least 2005. It has grown and has unbundled numerous other utilities from the Paste core. These utilities are part of the Paste project, but form their own packages and have their own version numbers. WebOb is a wrapper around the WSGI environment. Paste Deploy is a system for finding and configuring WSGI applications and servers. Paste Script, WebTest, ScriptType, INITools, Tempita, WaitForIt, WPHP, WSGIFilter, and WSGIProxy are other notable bundles.

See Also

References

  1. ^ http://reddit.com/r/programming/info/ehyf/comments/ceifh
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