[issue16204] PyBuffer_FillInfo returns 'B' buffer, whose behavior has changed w.r.t. 3.1/3.2

2013-03-23 Thread STINNER Victor 

STINNER Victor added the comment:

@skrah: ping!

@piro: can't you modify psycopg2 to add conditional code depending on the 
Python version? IMO the behaviour change is wanted.

http://www.python.org/dev/peps/pep-3118/

--
nosy: +haypo

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[issue16204] PyBuffer_FillInfo returns 'B' buffer, whose behavior has changed w.r.t. 3.1/3.2

2013-03-23 Thread Stefan Krah 

Stefan Krah added the comment:

I've corresponded privately with Daniele Varrazzo about the psycopg2
issue already and then forgot about this (the psycopg2 fix is good).

Yes, the change was intentional. There's one open issue (#15944)
where dabeaz isn't happy about the change, so let's make that a
superseder.

--
resolution:  - duplicate
stage:  - committed/rejected
status: open - closed
superseder:  - memoryviews and ctypes

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[issue16204] PyBuffer_FillInfo returns 'B' buffer, whose behavior has changed w.r.t. 3.1/3.2

2012-10-11 Thread Daniele Varrazzo 

New submission from Daniele Varrazzo:

Definitely related to this change in Python 3.3:

Accessing a memoryview element with format ‘B’ (unsigned bytes) now 
returns an integer (in accordance with the struct module syntax). 
For returning a bytes object the view must be cast to ‘c’ first.

The object returned by PyBuffer_FillInfo is 'B' format: this means that python 
code finds itself dealing in Py 3.3 with a different object respect to what 
returned in Py 3.1 and 3.2. Is this change in the behavior wanted? Wouldn't 
have been better having FillInfo return a 'c' buffer instead?

I'm adding support to Py 3.3 to psycopg2 and the B buffers make the test suite 
fail. I want psycopg to return consistent objects across 3.x. Is the change in 
this commit correct?

https://github.com/dvarrazzo/psycopg/commit/469b6f8aff4cafe203d851b19bedfab0128e795a

Is this a good way to return a 'c' buffer?

--
messages: 172710
nosy: piro
priority: normal
severity: normal
status: open
title: PyBuffer_FillInfo returns 'B' buffer, whose behavior has changed w.r.t. 
3.1/3.2
type: behavior
versions: Python 3.3

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[issue16204] PyBuffer_FillInfo returns 'B' buffer, whose behavior has changed w.r.t. 3.1/3.2

2012-10-11 Thread Antoine Pitrou 

Changes by Antoine Pitrou pit...@free.fr:


--
keywords: +3.3regression
nosy: +skrah
versions: +Python 3.4

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