[Python-Dev] PEP about sys.implementation and implementation specific user site directory

[M.-A. Lemburg]

Christian Heimes wrote:
> sys.implementation
> ------------------
> 
> platform (required):
>   platform or language of the implementation, for example "C", ".NET",
> "Java"

I'd call this attribute "language". We already have sys.platform with
a different meaning.

Possible values would then be "C", "C#", "Java", "Python", etc.

> runtime (required):
>   lower case runtime library of the implementation, for example "libc",
> "msvcrt90", "java6", ".net"
> 
> compiler (required):
>   verbose name of the compiler, for example "GCC 4.3.3", "Java
> HotSpot(TM) Client VM (Apple Inc.)", "Mono JIT compiler version 2.0.1"

If you include the compiler as well, it may make sense to
also add the other creation details that platform.py parses
from the sys.version string:

branch, revision, buildno, builddate

> ...
> 
> 
> sys.userdirsuffix
> -----------------
> 
> sys.userdirsuffix is an implementation and platform specific string that
> is used to construct the path for the user site directory as explained
> in PEP 370. The string contains the implementation name as well as the
> version number of Python.

Don't we already have this information available as site.getuserbase()/
site.getusersitepackages() ?

> Examples:
>   python2.6 (CPython, Unix)
>   Python26 (CPython, Windows)
>   ironpython2.6 (IronPython, Unix)
>   IronPython26 (IronPython, Windows)
>   ...
> 

Since the examples point to the name of the Python stdlib dir
and this form is also used in a lot of other places to distinguish
different Python versions (e.g. in distutils build dirs), perhaps
we should use a more generic name for it like e.g. sys.versiondir ?!

-- 
Marc-Andre Lemburg
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