Python 使用pip install 时报错（WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, ）

pip install时报错如下：

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLZeroReturnError(6, 'TLS/SSL connection has been closed (EOF) (_ssl.c:1149)'))': /simple/some-package/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLZeroReturnError(6, 'TLS/SSL connection has been closed (EOF) (_ssl.c:1149)'))': /simple/some-package/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLZeroReturnError(6, 'TLS/SSL connection has been closed (EOF) (_ssl.c:1149)'))': /simple/some-package/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLZeroReturnError(6, 'TLS/SSL connection has been closed (EOF) (_ssl.c:1149)'))': /simple/some-package/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLZeroReturnError(6, 'TLS/SSL connection has been closed (EOF) (_ssl.c:1149)'))': /simple/some-package/
Could not fetch URL https://pypi.tuna.tsinghua.edu.cn/simple/some-package/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.tuna.tsinghua.edu.cn', port=443): Max retries exceeded with url: /simple/some-package/ (Caused by SSLError(SSLZeroReturnError(6, 'TLS/SSL connection has been closed (EOF) (_ssl.c:1149)'))) - skipping

原因是开着代理（梯子），关闭梯子就可正常安装了。

不想关梯子的还可以使用以下方法：
找到电脑中的pip.ini文件（用everything等软件），然后添加代码：

[global]
no-proxy = *

这个文件也可加入一些镜像网站，我的整个文件内容是：

[global]
no-proxy = *
index-url =  https://pypi.mirrors.ustc.edu.cn/simple
[install]
trusted-host =  https://pypi.mirrors.ustc.edu.cn