[XML-SIG] Python package name

[Martin v. Loewis]

> __version__.py has less of a chance of getting lost when moving or
> copying files.  It can be consulted by Python code by simply saying
> 
>   import package
>   if package.__version__.version <= (1, 2, 3): ...
> 
> We may restrict the contents of __version__.py for the purpose of
> parsing or evaluating by a version dependency checker.

This is probably off-topic here, and a worth a separate PEP, but...

I always disliked __init__.py; files with that many underscores look
wrong. So the prospect of adding another file with underscores is
saddening.

Regards,
Martin