user site-packages, --prefix, --home and friends

[Carl]

I am very confused by PEP-370 per-user site-packages. It is not
mentioned at all in the document about installing Python modules :
http://docs.python.org/3.0/install/index.html.

It seems that --home or --prefix already provide per-user site-
packages capability. Can someone explain what are the differences and
what is the best practice in various situations?

Thanks, Carl

 

[R. David Murray]

I am very confused by PEP-370 per-user site-packages. It is not
mentioned at all in the document about installing Python modules :
http://docs.python.org/3.0/install/index.html.

It seems that --home or --prefix already provide per-user site-
packages capability. Can someone explain what are the differences and
what is the best practice in various situations?

I'm by no means an authority, but by my reading of the PEP there are
two major items that differentiate --user from --prefix and --home:
automatic per-python-version installation, and handling of .pth files.

As for best practice, I would say whichever one meets your needs.
The PEP is addressing the needs of users who do not have root privs but
who want to install packages via distutils in such a way that they will
act as if they had been installed in the system site-packages directory.