pip提示找不到ssl模块

问题

CentOS 6.6, python 2.7.11
使用pip安装RobotFramework报错：

There was a problem confirming the ssl certificate: Can’t connect to HTTPS URL because the SSL module is not available.

解决方法

1. 安装openssl、openssl-devel、pyOpenSSl包

   yum install openssl
   yum install openssl-devel
   yum install pyOpenSSL

1. 修改Python安装配置文件
   vim Python-2.7.11/Modules/Setup

   # Socket module helper for socket(2)
   _socket socketmodule.c timemodule.c
   
   # Socket module helper for SSL support; you must comment out the other
   # socket line above, and possibly edit the SSL variable:
   #SSL=/usr/local/ssl
   _ssl _ssl.c \
   -DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \
   -L$(SSL)/lib -lssl -lcrypto

去掉最后这三行的注释

1. 重新编译Python安装
   make clean && make && make install
2. 测试，正常可用