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.
