Python 2.7 的第一个 Alpha 版本发布

Python 的官方网站刚刚发布了 Python 2.7 的第一个 alpha 版本，与 Python 3.0 对应的是 Python 2.6 ，而 Python 3.1 对应的则是 Python 2.7 ，因此 Python 2.7 的内容跟 Python 3.1 的内容相似，主要体现在以下一些方面：

A partial list of 3.1 features that were backported to 2.7:

• A version of the io library, rewritten in C for performance.
• The ordered-dictionary type described in PEP 372: Adding an ordered dictionary to collections.
• The new format specified described in PEP 378: Format Specifier for Thousands Separator.
• The memoryview object.
• A small subset of the importlib module described below.

One porting change: the -3 switch now automatically enables the -Qwarn switch that causes warnings about using classic division with integers and long integers.

Other new Python3-mode warnings include:

• operator.isCallable() and operator.sequenceIncludes(), which are not supported in 3.x.

下载地址：

http://www.python.org/download/releases/2.7/