pip install scrapy
错误1:安装scrapy提示安装scrapy提示Could not find a version that satisfies the requirement Twisted>=10.0.0 (from scrapy) (from versions: )No matching distribution found for Twisted>=10.0.0 (from scrapy)
解决方法：
wget https://pypi.python.org/packages/source/T/Twisted/Twisted-15.2.1.tar.bz2#md5=4be066a899c714e18af1ecfcb01cfef7
tar -xjvf Twisted-15.2.1.tar.bz2
cd Twisted-15.2.1
python setup.py install至此，Twisted-15.2.1安装成功了
再次运行pip install scrapy
错误2：
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Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?
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error: command 'gcc' Failed with exit status 1
解决方法：
1.下载libxml2-2.6.26.tar.gz
2.tarzxvflibxml2-2.6.26.tar.gz
3.cd libxml2-2.6.26
4../configure
5.make
6.make install
