[Python-Dev] Using PEP384 Stable ABI for the lzma extension module

[Antoine Pitrou]

On Tue, 4 Oct 2011 13:05:58 -0400
Nick Coghlan <ncoghlan at gmail.com> wrote:
> 
> > - _PyBytes_Resize() is missing; I moved it under a Py_LIMITED_API
> >  section.
> 
> No, that's not valid. Bytes are officially immutable - mutating them
> when the reference count is only 1 is a private for a reason. The
> correct way to do this without relying on that implementation detail
> is to use a byte array instead.

Uh, no, it depends what you're doing. There's no reason not to allow
people to resize a bytes object which they've just allocated and is
still private to their code. That's the whole reason why
_PyBytes_Resize() exists, and the use case is not exotic.

Telling people to "first create a bytearray and then create a bytes
object from that when you're finished" would be a shame.

Regards

Antoine.