解决pip Could not fetch URL There was a problem confirming the ssl certificate: HTTPSConnectionPool问题
linux环境下
不管你有几个pip pip2还是pip3
都把pip更换为国内源，可以大大的提高安装成功率和速度。
修改配置文件
首先在当前用户目录下建立文件夹.pip，然后在文件夹中创建pip.conf文件，再将源地址加进去即可。
mkdir ~/.pip
vim ~/.pip/pip.conf
写入一下内容
[global]
index-url=http://mirrors.aliyun.com/pypi/simple/
[install]
trusted-host=mirrors.aliyun.com
这个trust！信任！很重要！
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