[PyQt] Missing method for QByteArray and Python3?

[detlev]

On Sonntag, 10. Januar 2010, Phil Thompson wrote:
> On Sun, 10 Jan 2010 14:05:36 +0100, detlev <detlev at die-offenbachs.de>
> 
> wrote:
> > On Sonntag, 10. Januar 2010, Phil Thompson wrote:
> >> On Sat, 9 Jan 2010 18:33:32 +0100, detlev <detlev at die-offenbachs.de>
> >>
> >> wrote:
> >> > Hi,
> >> >
> >> > really often I have this kind of code in my application when it comes
> >> > to
> >> > converting a QByteArray to s string under Python 3.1.
> >> >
> >> > s = bytes(QByteArray).decode()
> >> >
> >> > In Python 2 one could use
> >> >
> >> > s = unicode(QByteArray)
> >> >
> >> > to get the same result. Did I miss something or could QByteArray get a
> >> > decode() method to make it similar to a Python3 bytes or bytearray
> >> > type?
> >>
> >> The Python3 way to do it is...
> >>
> >> s = str(QByteArray, encoding='ascii')
> >>
> >> ...or whatever encoding is used.
> >>
> >> It would be possible to change things so that...
> >>
> >> s = str(QByteArray)
> >>
> >> ...automatically uses the default encoding. However that would then make
> >> it
> >> inconsistent with the behaviour of...
> >>
> >> s = str(bytes)
> >>
> >> ...and I'm not sure that that is a good idea.
> >>
> >> Phil
> >> _______________________________________________
> >> PyQt mailing list    PyQt at riverbankcomputing.com
> >> http://www.riverbankcomputing.com/mailman/listinfo/pyqt
> >
> > Maybe QByteArray should be changed to a mapped type and bytearray should
> 
> be
> 
> > used (like the QString change).
> 
> I've been thinking about that as well, but...
> 
> - Qt uses QByteArray to represent binary data *and* C-style strings. It
> might not be appropriate to convert the latter to bytearray.
> 
> - are there places in Qt that a QByteArray is being used to hold a large
> amount of data, and so the overhead of the conversion may be significant?
> 
> - I would want the conversion to bytearray to be the default for Python v3
> (although changeable with sip.setapi()). Is it too late to be introducing
> incompatible changes to the Python v3 support?
> 
> Phil
> _______________________________________________
> PyQt mailing list    PyQt at riverbankcomputing.com
> http://www.riverbankcomputing.com/mailman/listinfo/pyqt
> 

I'm nearly finished porting eric to Python3 (although there are probably a 
whole bunch of porting related bugs still to be discovered). Introducing an 
incompatible change would cause some extra work and would delay the first 
snapshot. However, if such a change is envisaged, it should be done now before 
a whole bunch of PyQt4 stuff has been ported. That means my opinion is "do it 
now or never". If it is done, it should be part of PyQt 4.7/sip 4.10.

Regards,
Detlev
-- 
Detlev Offenbach
detlev at die-offenbachs.de