What is the reason why python stays in the installation interface for a long time?

is the python installation package, does not include webinstall

Did you download the python installation package, Is it something like python-3.7.2-amd64-webinstall.exe that contains webinstall?

Is the previous installation not clean

I guess it's the plugin. Does installing Anaconda mean you don't need to install it?

Yes, commonly used libraries are included, do not allow yourself to toss.

Reinstall, maybe you click Download some plug-in button, this will be downloaded from the Internet, so the installation fails, you can reinstall, do not check the plug-in, do not select