centos 7 安装scrapy遇到的问题

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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：

    *********************************************************************************
    Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?
    *********************************************************************************
    error: command 'gcc' failed with exit status 1

解决方法：

1.下载libxml2-2.6.26.tar.gz

2.tar zxvf libxml2-2.6.26.tar.gz

3.cd libxml2-2.6.26

4../configure

5.make

6.make install

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