__del__ not called?

[Gregor Horvath]

Felipe Almeida Lessa schrieb:

 >>>>del B
 >>>># We'll to tell him to collect the garbage here, but
 >
 > ... # usually it should not be necessary.

Thanks. If I do

del B

then the __del__ of A gets called.
That surprises me. I thought that B gets del'd by python when it goes 
out of scope?

Do I manually have to del all class objects, so that their class 
attributes get gc'd ????

--
Gregor