Pyjs - 用于Web和桌面應用開發的 Python RIA 開發平臺

Pyjs 是用于Web和桌面應用開發的 RIA 開發平臺，包含一個 Python 到 JavaScript 的編譯器，一個 Ajax 框架和一組 Widget API。Pyjs 相當于是谷歌的 GWT 的 Python 移植版本，同時也支持桌面應用開發 —— Pyjs Desktop，可直接使用獨立桌面應用程序的方式來運行相同代碼的 Web 項目，而無需打開瀏覽器。

支持以下特性：

• Dynamic and reusable UI components: programmers can use pre-designed classes to implement otherwise time-consuming dynamic behaviors, such as drag-and-drop or sophisticated visual tree structures.
• Supports basic python types, emulated in javascript, such as List, Dictionary, Tuple, string; many of the standard python builtin functions, such as map, filter, range; and some of the standard python Exceptions are supported.
• Declarative style of "desktop" widget programming (almost identical to python-qt4, python-gtk2 and python-wxWidgets), yet the applications are compiled to javascript and run in all major web browsers.
• Simple RPC mechanism
• Browser history management, covering "Back", "Forward" with no hassle for the developer. AJAX applications typically break the "Go Back" button: use the History module to provide your application with History management.
• Run-time Support for runtime errors: a function call stack can be kept in debug mode, and displayed when a runtime error occurs. This is incredibly useful in situations where installing a Javascript debugger is inconvenient or impossible.
• Pyjs handles all cross-browser issues for the developer.
• The developers can mix handwritten JavaScript in the Python source code, including plumbing in to other Javascript frameworks and libraries.
• Beginnings of support for using Google APIs in GWT applications (initially, support for Google Gears Database)
• Pyjs is entirely Free Software.
• The developers can design and develop their application in a pure object-oriented fashion, since they're using Python (instead of JavaScript).

一段簡單的 Pyjs 代碼：

import pyjd # this is dummy in pyjs
from pyjamas.ui.RootPanel import RootPanel
from pyjamas.ui.Label import Label

pyjd.setup('public/hello.html')
l = Label('Hello Pyjs')
RootPanel().add(l)
pyjd.run()

項目主頁：http://www.baiduhome.net/lib/view/home/1337216136260