[mod_python] How do you make a subrequest?

I want to make a subrequest to a URI, but not as a redirect, more like 
an include.  The sub request would return the result of the request as 
a string.  Is there a way to do this?  I assume it is doable in the 
Apache API.  Even a pointer to some other apache module's c code that 
does it would be helpful.

Thanks
Scott Sanders