[issue21057] TextIOWrapper does not support reading bytearrays or memoryviews

[Nikolaus Rath]

Nikolaus Rath added the comment:

On 03/26/2014 03:43 AM, STINNER Victor wrote:
>> class MyByteStream(BytesIO):
>>    def read1(self, len_):
>>        return memoryview(super().read(len_))
>> bs = MyByteStream(b'some data in ascii\n')
> 
> I guess that you are trying to implement a zero-copy I/O. The problem is that BytesIO does copy data. 

Right on the first count, but wrong on the second. The class I'm
concerned with wants to do zero-copy I/O, but is not related to BytesIO.
I only picked that to produce a minimal example.

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<http://bugs.python.org/issue21057>
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