python官网：python-2.7.12.amd64.msi
https://pypi.python.org/pypi/setuptools：setuptools-28.6.0.zip
setuptools-28.6.0>python setup.py install
https://pypi.python.org/pypi/lxml/3.6.0：lxml-3.6.0.win-amd64-py2.7.exe
>easy_install lxml-3.6.0.win-amd64-py2.7.exe
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