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centos7，Python2.7安装request包
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1、安装epel扩展源：“sudo yum install epel-release”
2、安装python-pip：“sudo yum install python-pip”
3、升级pip：“sudo pip install --upgrade pip”
4、安装requests包：“sudo pip install requests”
5、清除cache：“sudo yum clean all”
http://blog.csdn.net/trb331617/article/details/72851971
