21 Aug 2009

python的对象驻留

在C#中为了提高性能使用了字符串驻留技术，而在Python中不光是字符串，连整数都有使用类似的驻留技术哦，看下面的测试：

C:\Documents and Settings\Marble Wu>python
Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> a=1
>>> b=1
>>> id(1)
10446048
>>> id(a)
10446048
>>> import sys
>>> sys.getrefcount(a)
245
>>> sys.getrefcount(b)
245
>>>

其实也很容易理解，因为在Python一切皆对象

11 Aug 2009

如何在windows xp下安装python2.6的setuptools

LAMP Windows python setuptools ez_setup

最近开始学python，要安装很多egg文件，但发现http://pypi.python.org/pypi/setuptools#downloads没有python2.6的MS Windows installer版本，google了一把，用如下方法解决：

1. 下载 setuptools-0.6c9.tar.gz
2. 下载 setuptools-0.6c9-py2.6.egg （放在同一个目录）
3. 用7-zip或者其他解压工具打开 setuptools-0.6c9.tar.gz ，并且把里面的 ez_setup.py 文件解压到同一个目录里。
4. 打开cmd窗口，并进入你刚才下载和解压文件的目录里。（例如： d:\downloads\）
5. 输入 python ez_setup.py setuptools-0.6c9-py2.6.egg

提示如下:

E:\temp>python ez_setup.py setuptools-0.6c9-py2.6.egg Processing setuptools-0.6c9-py2.6.egg Copying setuptools-0.6c9-py2.6.egg to c:\python26\lib\site-packages Adding setuptools 0.6c9 to easy-install.pth file Installing easy_install-script.py script to C:\Python26\Scripts Installing easy_install.exe script to C:\Python26\Scripts Installing easy_install-2.6-script.py script to C:\Python26\Scripts Installing easy_install-2.6.exe script to C:\Python26\Scripts

Installed c:\python26\lib\site-packages\setuptools-0.6c9-py2.6.egg Processing dependencies for setuptools==0.6c9 Finished processing dependencies for setuptools==0.6c9 Processing setuptools-0.6c9-py2.6.egg Removing c:\python26\lib\site-packages\setuptools-0.6c9-py2.6.egg Copying setuptools-0.6c9-py2.6.egg to c:\python26\lib\site-packages setuptools 0.6c9 is already the active version in easy-install.pth Installing easy_install-script.py script to C:\Python26\Scripts Installing easy_install.exe script to C:\Python26\Scripts Installing easy_install-2.6-script.py script to C:\Python26\Scripts Installing easy_install-2.6.exe script to C:\Python26\Scripts

Installed c:\python26\lib\site-packages\setuptools-0.6c9-py2.6.egg Processing dependencies for setuptools==0.6c9 Finished processing dependencies for setuptools==0.6c9

E:\temp>

武眉博

Marble's blog

21 Aug 2009

11 Aug 2009