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Safari | Python Developer's Handbook -> Third-Party Internet Applications





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Third-Party Internet Applications

Some completely developed Web applications, written in Python, are available for general use. You don't need to do any programming to use them. You just have to install, configure, and use them.

Grail Web Browser

Grail is a free Web browser written entirely in Python, using the Tkinter GUI (Tk, which is a free UI toolkit developed by John Ousterhout). Grail has the capability to manipulate SGML, HTML, URL's, images, and sound. Besides, it is easily extended to offer new functionality.

Being written in Python helps Grail to have a high adhesion to the Python language. Something similar happens to HotJava, which is a browser written entirely in Java.

For documentation and downloads, check out the following sites:

http://grail.python.org and http://grail.cnri.reston.va.us/grail/

Grail should run on any UNIX system to which Python and Tk have been portedthat is, almost all UNIX systems supporting X11. In particular, Grail is one of the few Web browsers that supports Solaris for Intel x86 processors. It now also runs on Windows and Macintosh because there are now stable ports of Tk to those platforms (you need a lot of RAM though). Grail supports the protocols and file formats commonly found on the World Wide Web, such as HTTP, FTP, and HTML. However, it is easily extended to support new protocols or file formats. Grail is distributed by CNRI in source form, free of charge (without warranties), and can be freely redistributed (within reason). Grail has not been worked on for a while, and doesn't support any of the latest standards you might expect in a browser.

Grail's design tries to provide a plug-in architecture, which allows the browser to easily support applets written in Python. Grail lets you download Python programs that execute inside Grail on your local machine. These little applications, which are called applets can do things such as display animations, interact with the user in new ways, even create additional menus that pop up dialogs if you like. Grail applets run in a restricted execution environment, so broken or malicious applets (Trojan Horses) can't erase your files or crash your computer.

Grail's Web site has an applet demo collection that you can explore.

Grail has many positive qualities, such as support to full HTML 2.0, including images, forms and image maps, as well as many HTML 3.2 features. It uses asynchronous document transfer and supports printing and saving documents, searching, bookmarks, history, and more. It also supports frames, file upload in forms, support for JPEG, TIFF, and XBM images, image printing, and tables (within the limitations of the Tk toolkit). It has preference panels, an I/O status display, a remote control interface, and many other nice features.

Apart from running applets, Grail is extensible in other areas, by writing so-called Grail plug-in modules. Grail plug-ins can be written for a number of new implementations, such as protocols (for example, CNRI's handle protocol), file formats (for example, for handling JPEG or sound directly), HTML tags (for example, tables), and preference panels. Check out the following site for more information:

GrailThe Browser For The Rest Of Us (DRAFT), by Guido van Rossum

http://grail.cnri.reston.va.us/grail/info/papers/restofus.html

Zope Web Application Server

The Z Object Publishing Environment, also known as Zope, is an open source object publishing system for the Web, developed by a company called Digital Creations. Zope is a complete dynamic Web site management Web platform used for building high-performance, dynamic Web sites. Essentially, it is a very complete framework for building Web applications, written in Python.

Check out the following sites for details:

http://www.digicool.com and http://www.zope.org

Zope is the leading Open Source Web-application server. Zope enables teams to collaborate in the creation and management of dynamic Web-based business applications such as intranets and portals. It also makes it easy to build features such as site search, news, personalization, and e-commerce into your Web applications.

Zope is a long running process, has a sophisticated authentication/authorization model, and has a useful SQL related product called ZSQLMethod, which provides an easy way to access a database from the Web application.

The following link is a technical introduction to object publishing with Zope. The document introduces Zope's object publishing facilities and shows you how to write and publish your own objects in Python. It has an excellent tutorial on integrating a Python module with the Zope ORB, Templates and Object Database.

http://www.zope.org/Members/Amos/WhatIsObjectPublishing

All requests made to the application server are mapped to Python objects. Therefore, whenever you make a call to a URL, as demonstrated in the following line of code

http://host/path/to/object?name1=value1&name2=value2

The server internally calls an object passing the pairs (name, value) as arguments.

Zope is not monolithic. Instead, it is composed of parts which can be deployed standalone with your own Python code support; for example, the Object Request Broker, HTML Templates (DTML) and the Object Database (ZOBD, Z Object Database, which stores Python objects) can all be abstracted from the mix.

Zope's templates are somehow similar to IIS ASP files. However, instead of being associated to Web pages, they are associated to Python objects.

You don't need to use Apache (PyApache/Httpdapy) in conjunction with Zope. In fact, Zope comes with a fast Web server of its own, which supports multiple protocols. On the other hand, it can also work with other Web servers as well. Most users do put Apache in front of Zope for reasons of flexibility. B ... ... (Not finished, please download and read the complete file)

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