1.oracle官网下载两个zip包，11或者12c版本应该都可以

       instantclient-basic-linux.x64-11.2.0.4.0.zip

       instantclient-sdk-linux.x64-11.2.0.4.0.zip 

    2.上传安装包至/root，unzip解压

       unzip ./instantclient-basic-linux.x64-11.2.0.4.0.zip
       unzip -o ./instantclient-sdk-linux.x64-11.2.0.4.0.zip

    3.设置环境变量,拷贝动态库

       export ORACLE_HOME=/root/instantclient_11_2/

       cp -rf /root/instantclient_11_2/lib* /usr/lib/
       ln -sv /root/instantclient_11_2/libclntsh.so.11.1 /usr/lib/libclntsh.so

    4.安装cx_oracle

       pip install cx_oracle==5.3