Distutils evil voodoo: install into a package

[Pavel Panchekha]

Before you flame me, I know that what I'm trying to do is beyond evil.
But I nonetheless want to do it. Feel free to rant if you must. :)

I have a package that I want to install into another package. For
example, I have the packages pya and pyb.
pya is guaranteed to be installed before pyb is, so that's not an
issue. pya is installed as the module `pya`. I want to install pyb
into the module `pya.pyb`.

Is there any way to do this beyond figuring out what the path is and
installing the entire pyb directory as data_files?