[Python-Dev] Change PEP 399 import recommendation

[Christian Heimes]

Am 12.10.2013 17:37, schrieb Nick Coghlan:
> I think the default recommendation in PEP 399 still makes sense - 2
> modules are easy to manage than three and the idiom allows for easy
> partial replacement.

We could ues yet another approach and put the pure Python implementation
of modules into another directory (e.g. Lib/pystdlib or Lib/purepython).
This directory is appended to sys.path. Alternative implementations of
Python or platforms without the necessary bits and pieces would import
the Python-only version from that directory. C modules can be renamed so
CPython picks them up in favor of the pure Python modules. No hacks, no
facade module, no slow down and it's easy to understand, too.

The approach can be used for stat, operator, decimal and perhaps other
modules, too.

Christian