[Tutor] ensuring a __del__ method happens

[Sean 'Shaleh' Perry]

> 
> The best solution is to hold on to the functions you need (not the
> module) and use those in the __del__ method.  For example, I have a
> TempFile class in my mimecntl module which goes something like:
> 
> class TempFile:
> <rest snipped>

> This should handle most all the cases that exist (it sounds like you'll
> want to have listdir, remove, rmdir, and others to handle any subfiles).
> 

Hmmm, will look into this.  I am still confused because I have my del method
printing a 'I am exiting' string which I never see.

I have Foo and TemporaryFoo.  Foo does not have a __del__ method.  TemporaryFoo
does.  The class is instantiated as:

if need_temp:
   foo = TemporaryFoo()
else:
   foo = Foo()

..... # time passes

when foo is destroyed, either by sys.exit(), an exception, whatever I never see
TemporaryFoo's del method.  Do I need to add a dummy __del__ method to the base
class?