How do I define a __del__ method for an object?

[Stewart Midwinter]

I was looking through Swaroop's tutorial, "A Byte of Python", on Python 
objects,(http://www.python.g2swaroop.net/), and he mentions that you can 
define a __del__ function to completely delete object instances. 
However, when I try to define one in the attached script, not just one, 
but all, of the defined objects disappear.

Can someone show me how to define a __del__ object that works on only 
one object instance?

Thanks
Stewart
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