[issue29742] asyncio get_extra_info() throws exception

[Nikolay Kim]

Nikolay Kim added the comment:

get_extra_info() returns optional transport information, I think it is ok to return None for closed transport.
https://github.com/python/cpython/blob/master/Lib/asyncio/transports.py#L18

I propose this feature initially, during early tulip development
but now I think it is not good api.

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<http://bugs.python.org/issue29742>
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