Wolfgang Maier added the comment:
> memoryview is converted to bytes because len() for memoryview returns a size
> of first dimension (a number of items for one-dimension view), not a number
> of bytes.
>
>>>> m = memoryview(array.array('I', [1, 2, 3]))
>>>> len(m)
> 3
>>>> len(m.tobytes())
> 12
>>>> len(m.cast('B'))
> 12
Right, I was aware of this. But are you saying that my proposed solution (using
memoryview.nbytes) is wrong ? If so, then cast is certainly an option and
should still outperform tobytes.
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<http://bugs.python.org/issue23688>
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