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使用setup.py来安装的python项目，指定其安装路径的参数是“--prefix=”。例如“python setup.py install --prefix=/usr”。

http://www.cnblogs.com/itech/archive/2011/02/27/1966522.html

亮点：

1. install Twisted
Twisted 依赖 zope.interface and Python
wget -c http://tmrc.mit.edu/mirror/twisted/Twisted/8.1/Twisted-8.1.0.tar.bz2
python setup.py install --prefix=$HOME

install zope.interface
wet -c http://www.zope.org/Products/ZopeInterface/3.3.0/zope.interface-3.3.0.tar.gz
python setup.py build
python setup.py install --prefix=$HOME