Python 3.x在WIN7下安装

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背景：之前建个人站点gnssinfo.com曾从网上download了一个开源的python 2.x版本的工具，用来从163上下载blog；
这两天把python 2.7删掉，然后安装最新版3.3，无法启动，换装3.2同样无法启动，均提示以下错误：

Fatal Python error: Py_Initialize: unable to load the file system codec
LookupError: no codec search functions registered: can’t find encoding
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application’s support team for more information.

用控制台启动，查询版本，报如下错误：

E:\Python32>python -v
# installing zipimport hook
import zipimport # builtin
# installed zipimport hook
Fatal Python error: Py_Initialize: unable to load the file system codec
LookupError: no codec search functions registered: can’t find encoding
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application’s support team for more information.

百度不给力，google了N久，终于在python.org网站上找到答案，具体页面为：http://bugs.python.org/issue11288
原网页提示解决方案如下：

I have found a problem and sollution:
previously I have used Python 2.x and when I removed that version and next installed Python32, PYTHONPATH in system variabled indicated still to Python2.x. Removing all python paths to old version solved the problem.

与笔者电脑上问题一样，找到系统高级环境变量设置，将PYTHONPATH更改指向E:\Python32目录。重新从菜单打开IDLE（Python GUI）即可启动。
IDLE启动后，界面提示信息如下：
Python 3.2.2 (default, Sep 4 2011, 09:51:08) [MSC v.1500 32 bit (Intel)] on win32
Type “copyright”, “credits” or “license()” for more information.
>>>

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