Марк Коренберг added the comment:

Also I recommend you to use asyncio streams, instead of reinventing wheels.

So, reading your command will look like:

data = await stream.read_exactly(4)
(len,) = unpack(">I", data)
command = await stream.read_exactly(len)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27386>
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