pip will install packages to user site by default

[eight04]

pypa/pip#1668
pypa/pip#7002
Investigate how does it work with venv.

[takluyver]

It should still work as before with a venv - it will only do a user install if it doesn't have write access to the site-packages directory where a normal install would go. And only if site.ENABLE_USER_SITE is true as well.

[eight04]

It seems that the Python installer doesn't add user-site to %PATH% if you selected Install for all users (which installs python to program files).

As the result, even if the link success, the user still can't access the CLI.

Windows 10 64bit
Python 3.8.1 32bit