Finding it very difficult to move pyexiv2 code from Python 2 to Python 3

[Chris Green]

Chris Angelico <rosuav at gmail.com> wrote:
> On Fri, Aug 21, 2020 at 3:21 AM Chris Green <cl at isbd.net> wrote:
> > It's actually more subtle and complicated than the OS changing or not
> > changing the default Python version.  There are quite a lot of
> > questions about exactly this on the Ubuntu lists.  All the OS python
> > code in Ubuntu 20.04 is now Python 3 but there are some other things
> > which I have installed (such as Mercurial) which still depend on
> > Python 2.  One can see what is affected by doing:-
> >
> >     $ sudo apt remove python2 --simulate
> >
> > This shows a mixture of old (and no longer needed) libraries that
> > would go with Python 2 but it also shows some things like Mercurial
> > that I need.
> 
> That seems odd. According to packages.ubuntu.com, Focal (20.04) is
> shipping Mercurial 5.3.1, and since version 5.2, Mercurial has
> supported Python 2.7 or 3.5+. However, it seems that the dependencies
> for the mercurial package specify python2 and no reference to python3.
> 
> https://packages.ubuntu.com/focal/mercurial
> 
> Fortunately, the *next* release of Ubuntu fixes this:
> 
> https://packages.ubuntu.com/groovy/mercurial
> 
> It depends on Python 3.8 instead. No idea why the 20.04 release insists on 2.7.
> 
OK, so that's one less thing needing Python 2, next release. :-)

-- 
Chris Green
·