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[Python-Dev] Adding bytes.frombuffer() constructor to PEP 467

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>
> bytes.frombuffer(x) is bytes(memoryview(x)) or memoryview(x).tobytes().
>

There is pitfall: memoryview should be closed.
So b = bytes.frombuffer(x) is:

with memoryview(x) as m:
    b = bytes(m)
    # or b = m.tobytes()

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