pip install xxx Could not fetch URL https://pypi.org/simple/pip/

Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirmingthe ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)'),)) - skipping

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解决办法：

1、新建一个pip.ini文件

[global]

index-url=http://mirrors.aliyun.com/pypi/simple/

[install]

trusted-host=mirrors.aliyun.com

2、将pip.ini文件添加到环境变量中。