centos7 python3中pip3安装模块出错，找不到SSL
```
报错代码
Could not fetch URL https://pypi.python.org/simple/pip/: There was a problem confirming the ssl certificate: Can't connect to HTTPS URL because the SSL module is not available. - skipping
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解决方法：
yum安装openssl-devel
cd Python-3.6.2
./configure --with-ssl
make && make install
```