Connection broken by 'readtimc rt-443): read timed out (read timeout=l5)“)‘: /pac

In the installation flask When installing some packages in the virtual environment of , Prompt some information that the version does not conform , This is because of the current pip Lower version , But the version of the package that needs to be installed is too high , Led to pip Can't install ,

Pictured ：

At this point, we can use upgrade pip Version order of , stay cmd In command , Enter the corresponding virtual environment directory , Enter upgrade pip Order ：

python -m pip install --upgrade pip

Under normal circumstances , After this operation , Just install it again , however , It's easy for us to have some problems in the installation , In the process of downloading and installing , Very slow , After downloading a part , Display error ：

Error reporting in the above figure , In fact, the download time is too long , Connection timeout . Because of the pip The download website is extranet , We download slowly , Cause connection timeout , At this point, we can download , Designate some domestic pip Source for download ：

Alibaba cloud http://mirrors.aliyun.com/pypi/simple/

University of science and technology of China https://pypi.mirrors.ustc.edu.cn/simple/

douban (douban) http://pypi.douban.com/simple/

Tsinghua University https://pypi.tuna.tsinghua.edu.cn/simple/

University of science and technology of China http://pypi.mirrors.ustc.edu.cn/simple/

So with these websites , How about using it ？
Here, take watercress as an example ：

upgrade pip：

python -m pip install --upgrade pip -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

Download package ： With flask-sqlalchemy For example ：

pip install flask-sqlalchemy -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

Download package ： With pymysql For example ：

pip install pymysql -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

summary ：

We just need to change the name of the installed package in the code , Like this code ： pip install pymysql -i http://pypi.douban.com/simple --trusted-host pypi.douban.com, We just need to pymysql Change to the package we need

In this way, we can pass the domestic pip Source , Download the packages we need quickly