elementtree（元素樹）。
elementtree是xml解析庫，已經在python2.5之後被包括在標準庫中。
elementtree感覺就像乙個輕量級的dom，具有方便使用、十分友好的api。除了**可復用之外，它執行速度快，消耗記憶體較少。這裡我們重點推薦使用elementtree。如果需要使用xml解析器，不妨先試一試elementtree。
tar zxvf elementtree-1.2.6-20050316.tar.gz
cd elementtree-1.2.6-20050316
chmod +x *.py
./setup.py install
[root@gd37vm01 elementtree-1.2.6-20050316]# ./setup.py install
running install
running build
running build_py
creating build
creating build/lib
creating build/lib/elementtree
copying elementtree/elementinclude.py -> build/lib/elementtree
copying elementtree/sgmlopxmltreebuilder.py -> build/lib/elementtree
copying elementtree/elementtree.py -> build/lib/elementtree
copying elementtree/elementpath.py -> build/lib/elementtree
copying elementtree/xmltreebuilder.py -> build/lib/elementtree
copying elementtree/__init__.py -> build/lib/elementtree
copying elementtree/******xmltreebuilder.py -> build/lib/elementtree
copying elementtree/tidyhtmltreebuilder.py -> build/lib/elementtree
copying elementtree/tidytools.py -> build/lib/elementtree
copying elementtree/******xmlwriter.py -> build/lib/elementtree
copying elementtree/htmltreebuilder.py -> build/lib/elementtree
running install_lib
copying build/lib/elementtree/elementinclude.py -> /usr/lib/python2.4/site-packages/elementtree
copying build/lib/elementtree/sgmlopxmltreebuilder.py -> /usr/lib/python2.4/site-packages/elementtree
copying build/lib/elementtree/elementtree.py -> /usr/lib/python2.4/site-packages/elementtree
copying build/lib/elementtree/elementpath.py -> /usr/lib/python2.4/site-packages/elementtree
copying build/lib/elementtree/xmltreebuilder.py -> /usr/lib/python2.4/site-packages/elementtree
copying build/lib/elementtree/__init__.py -> /usr/lib/python2.4/site-packages/elementtree
copying build/lib/elementtree/******xmltreebuilder.py -> /usr/lib/python2.4/site-packages/elementtree
copying build/lib/elementtree/tidyhtmltreebuilder.py -> /usr/lib/python2.4/site-packages/elementtree
copying build/lib/elementtree/tidytools.py -> /usr/lib/python2.4/site-packages/elementtree
copying build/lib/elementtree/******xmlwriter.py -> /usr/lib/python2.4/site-packages/elementtree
copying build/lib/elementtree/htmltreebuilder.py -> /usr/lib/python2.4/site-packages/elementtree
具體使用：
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