STINNER Victor added the comment:

Paulo Costa:
> async def async_read(fd. n):

This method already exists:
* (TCP) 
https://docs.python.org/dev/library/asyncio-protocol.html#asyncio.Protocol.data_received
* (UDP) 
https://docs.python.org/dev/library/asyncio-protocol.html#asyncio.DatagramProtocol.datagram_received
* (TCP) 
https://docs.python.org/dev/library/asyncio-stream.html#asyncio.StreamReader.read


Martin Panter:
> last time I looked they all seemed to buffer your write data and send it in 
> the background. E.g. in the echo-client-using-streams example, there is a 
> writer.write() call that does not use “yield from”. Does asyncio have an easy 
> way for a coroutine to write to a socket (or file descriptor) and block 
> (suspend the coroutine) until the write has finished

Sure, you must call 
https://docs.python.org/dev/library/asyncio-stream.html#asyncio.StreamWriter.drain

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<http://bugs.python.org/issue26270>
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