How to 'register' functions, so they can be called (plpythonu)

I am defining some functions using plpythonu, through the standard means.

Here I have one function (test1) which calls another (testfunc). When
I excute this I get the following error:

ERROR:  plpython: function "test1" failed
DETAIL:  <type 'exceptions.NameError'>: global name 'testfunc' is not defined

However, from the console, select testfunc('test') works fine.

I was wondering how do I 'register'/'reference' these functions so
that one function can call another? I am guessing this is important,
i.e. how will I access the complete functionality of the general
python libs?

Cheers, Blay.

PS functions are defined in the usual way - e.g.

create or replace function test1(text) returns integer as $$
return 1
$$ language plpythonu;