Benjamin Peterson added the comment:

In a sense, doing something like "with self.lock" in a generator is already a 
leak. Even if there wasn't a cycle, collection could be arbitrarily delayed (in 
partincular on non-CPython VMs). I wonder if making generators context managers 
which call close() on exit would help.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17468>
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