[docs] [issue25586] socket.sendall broken when a socket has a timeout

[STINNER Victor]

STINNER Victor added the comment:

I don't really understand why do even you consider the behaviour has a bug or a trap. On timeout, the most common behaviour is to give up on the whole client. I don't know code trying to resend the same data in case of timeout.

Describing the behaviour on the documentation helps, but no warning is need.

When you *read* data, it's different. It can be interesting to get the partial read.

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For example, the asyncio.StreamReader.readexactly() coroutine raises an asyncio.IncompleteReadError exception which contains the partial data:

https://docs.python.org/dev/library/asyncio-stream.html#asyncio.StreamReader.readexactly

The HTTP client has a similar exception.

I proposed to add similar method to socket.socket which also raises a similar exception to return partial data: issue #1103213.

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