[Python-Dev] Using PEP384 Stable ABI for the lzma extension module (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Tue Oct 4 21:12:04 CEST 2011

On Tue, 4 Oct 2011 13:05:58 -0400 Nick Coghlan <ncoghlan at gmail.com> wrote:

> - PyBytesResize() is missing; I moved it under a PyLIMITEDAPI >  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.

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