PIP install installs the third-party plug-in, and the URL of “could not fetch” appears https://pypi.python.org/simple/pool/ : there was a problem confirming SSL certificate

The solution is as follows:
create pip.ini in the python installation directory, and the configuration content of pip.ini is as follows:
0

[global]

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

[install]

trusted-host=mirrors.aliyun.com

The environment variable has configured the path of Python in the path, so there is no need to configure the path here, and then download the third-party plug-in with PIP