Python version indication

[Tim Michelsen]

Dear fellow packagers,
I need some advice on packaging python packages.

I have two packages:

1. package
 	The upstream author defines:

Python_ 2.4 or later.
   Please note that Python_ 3 is not supported yet.

	Therefore, I pu the minimum python version in my control file:

    XS-Python-Version: >= 2.4

2. package

The upstream author defines:

Requirements
            Python 2.x (x>=5)
            PyQt4 4.x (x>=3 ; recommended x>=4)
            QScintilla2 2.x (x>=1) (PyQt4 extension)

Therefore, I pu the minimum python version in my control file:

XS-Python-Version: >=2.5

I am on Ubuntu Karmic.
When installing the package generated with
dpkg-buildpackage -us -uc
the system also installes the modules files for Python 2.5 into:
/usr/lib/python2.5/site-packages/scikits.timeseries-0.91.3-py2.5.egg-info

and
/usr/lib/python2.6/site-packages/scikits.timeseries-0.91.3-py2.6.egg-info

So why are the build module files for Python 2.5 additionally installed?
What do I need to change in my control file in order to get only the
Python 2.6 files installed on systems where 2.6 is the default Python
version?

Thanks in advance,
Timmie