[docs] [issue17468] Generator memory leak

[Nick Coghlan]

Nick Coghlan added the comment:

We can't make ordinary generators innately context managers, as it makes the error too hard to detect when you accidentally leave out @contextmanager when using a generator to write a custom one.

You can already use contextlib.closing to forcibly close them when appropriate, so providing a decorator to implicitly map __exit__ to close wouldn't really save much.

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<http://bugs.python.org/issue17468>
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