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Wed Dec 27 11:28:41 EST 2017 · https://mail.python.org/pipermail/python-dev/2017-December/151465.html

On Wed, 27 Dec 2017 14:19:16 +0000
Jonathan Underwood <jonathan.underwood at gmail.com> wrote:
> Hello,
> 
> I am not sure if this is expected behaviour, or a bug.
> 
> In a C extension module, if I create and return an empty bytes object like this:
> 
>     val = PyBytes_FromStringAndSize (NULL, 20);
>     Py_SIZE(val) = 0;

I wouldn't call it "expected", but bytes objects are supposed to be
NULL-terminated internally, so your code technically creates an invalid
bytes object.  The NULL-terminated constraint may be relied on by some
code, for example when the string gets passed to a third-party C
function.

Perhaps that should be mentioned in the C API docs.

Regards

Antoine.

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[Python-Dev] When val=b'', but val == b'' returns False