Martin Panter added the comment:

Perhaps I shouldn’t have mentioned “del gen”. That was meant to represent the 
garbage collector running and calling gen.__del__() or equivalent. Basically 
what I was trying to say is I think there will be two classes of generators:

1. Simple generators just implementing the plain iterator protocol, where there 
is nothing to clean up. In these cases a ResourceWarning is unwanted. Example: 
generator expressions.

2. Complex generators that have special cleanup code. Ideally the user should 
either exhaust the generator or call its close() method, and a ResourceWarning 
would be useful if neither of these happen. Example: Nick’s mygen().

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28629>
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