[issue30847] asyncio: selector_events: add_excepter(), 3rd argument of select.select()

[Pim Klanke]

Pim Klanke added the comment:

To be able to use GPIO Sysfs Interface with asyncio on our embedded platforms, we require exceptional event support in asyncio.

depends on bpo-30844

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<http://bugs.python.org/issue30847>
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