[Discuss-gnuradio] Basic python question

[Phil]

I'm almost afraid to ask such a basic question. A Google search shows 
that the Internet is awash with all sorts of tutorials but I still 
haven't discovered the answer.

It dawned on me a couple of days ago that gnuradio is not a plug-and 
-play SDR, like several of the Windows SDR applications that I've played 
with, but a series of building blocks. My journey into gnuradio came to 
a halt very quickly.

My question is, how do I tell Python (I'm using it from the command 
line, no IDE yet) where the modules are located? As in the following 
example.

>>> from rtlsdr import *
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named rtlsdr

--
Regards,
Phil