(rypytorch) C:\Users\25797>pip install einops  --trusted-host=pypi.python.org --trusted-host=pypi.org --trusted-host=files.pythonhosted.org
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(136, '[X509] no certificate or crl found (_ssl.c:4140)'))': /simple/einops/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(136, '[X509] no certificate or crl found (_ssl.c:4140)'))': /simple/einops/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(136, '[X509] no certificate or crl found (_ssl.c:4140)'))': /simple/einops/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(136, '[X509] no certificate or crl found (_ssl.c:4140)'))': /simple/einops/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(136, '[X509] no certificate or crl found (_ssl.c:4140)'))': /simple/einops/
Could not fetch URL https://pypi.tuna.tsinghua.edu.cn/simple/einops/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.tuna.tsinghua.edu.cn', port=443): Max retries exceeded with url: /simple/einops/ (Caused by SSLError(SSLError(136, '[X509] no certificate or crl found (_ssl.c:4140)'))) - skipping
ERROR: Could not find a version that satisfies the requirement einops (from versions: none)
ERROR: No matching distribution found for einops
Could not fetch URL https://pypi.tuna.tsinghua.edu.cn/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.tuna.tsinghua.edu.cn', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError(SSLError(136, '[X509] no certificate or crl found (_ssl.c:4140)'))) - skipping
WARNING: There was an error checking the latest version of pip.

一、windws系统下pip镜像源配置 

1. 进入C:\Users\lenovo\AppData\Roaming 新建一个pip目录

 2.在该文件夹下创建pip.ini

3.写入以下内容

[global]

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

[install]

trusted-host=mirrors.aliyun.com

 或者

[global]
index-url = http://mirrors.aliyun.com/pypi/simple
extra-index-url = http://mirrors.aliyun.com/pypi/simple
 
[install]
trusted-host = 
	mirrors.aliyun.com
	pypi.douban.com
	pypi.tuna.tsinghua.edu.cn
	pypi.mirrors.ustc.edu.cn
	mirrors.ustc.edu.cn
	mirrors.bfsu.edu.cn
	pypi.hustunique.com

 或者清华源 

[global]
index-url = https://pypi.tuna.tsinghua.edu.cn/simple/
[install]
trusted-host = mirrors.tuna.tsinghua.edu.cn

4.再次安装 pip install flask 就可以安装了

二、mac os和linux 系统下pip镜像源配置

 1.查看当前用户根目录下是否有隐藏文件夹.pip

cd
pwd
ls -a

2.如果没有的话，创建隐藏文件夹.pip并且在.pip里创建一个名为pip.conf的配置文件

mkdir .pip
cd .pip
touch pip.conf

3.编辑pip.conf配置文件，写入清华源镜或者阿里源的像配置信息并保存

[global]

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

[install]

trusted-host=mirrors.aliyun.com

 或者

[global]
index-url=https://pypi.tuna.tsinghua.edu.cn/simple/
[install]
trusted-host=mirrors.tuna.tsinghua.edu.cn