centos6.8编译安装python2.7之后，使用pip报错：pip cannot confirm SSL certificate: SSL module is not available

解决方法：

安装openssl-devel 后重新编译安装python

ref：

https://stackoverflow.com/questions/25981703/pip-install-fails-with-connection-error-ssl-certificate-verify-failed-certi

https://stackoverflow.com/questions/44290926/pip-cannot-confirm-ssl-certificate-ssl-module-is-not-available

https://stackoverflow.com/questions/41328451/ssl-module-in-python-is-not-available-when-installing-package-with-pip3

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