[mythtv-users] MythTV and Python 3

[Andréas Kühne]

2014-10-14 10:09 GMT+02:00 Stephen Worthington <stephen_agent at jsw.gen.nz>:

> On Tue, 14 Oct 2014 09:56:46 +0200, you wrote:
>
> >2014-10-14 9:47 GMT+02:00 Stephen Worthington <stephen_agent at jsw.gen.nz>:
> >
> >> On Tue, 14 Oct 2014 09:06:35 +0200, you wrote:
> >>
> >> >2014-10-14 3:26 GMT+02:00 Stephen Worthington <
> stephen_agent at jsw.gen.nz>:
> >> >
> >> >> Mythbuntu 14.04, MythTV 0.27+fixes
> >> >>
> >> >> I was just looking at using Python for another MythTV script and I
> >> >> realised I should be writing it in Python 3 now that Python 2 is
> >> >> deprecated.  So I grabbed one of the MythTV scripts I downloaded a
> >> >> while ago (tunerstatus.py) and converted it to Python 3 to see if it
> >> >> would work.  But this is what I got:
> >> >>
> >> >> root at mypvr:~# tunerstat.py
> >> >> Traceback (most recent call last):
> >> >>   File "/usr/local/bin/tunerstat.py", line 6, in <module>
> >> >>     from MythTV import MythDB, MythBE
> >> >> ImportError: No module named 'MythTV'
> >> >>
> >> >> So it looks like the MythTV package(s) are not installed for Python
> 3.
> >> >> I have only dabbled in Python so far - I am far from an expert.  So I
> >> >> was wondering if anyone had run across this and if there was an easy
> >> >> solution, or whether I have to keep using Python 2 for now.
> >> >>
> >> >> And in general, what is the state of play with MythTV and Python 3?
> >> >> Are the MythTV bindings Python 3 compatible?  Is anyone working on
> >> >> moving MythTV scripts to Python 3?
> >>
> >> >It doesn't matter if it is compiled with python 2 or 3, that error just
> >> >means that Python can't find the Mythtv module. Check so that you have
> >> >access to the mythtv modules in your site packages for python.
> >> >
> >> >Regards,
> >> >
> >> >Andréas
> >>
> >> Yes, I figured that was what the error meant.  But the Python 2 MythTV
> >> packages are installed automatically as part of MythTV on Mythbuntu,
> >> so I have no idea as yet how to install them for Python 3 or if they
> >> would work if I did.  Synaptic says they are in the libmyth-python deb
> >> package and install to /usr/lib/python2.7/dist-packages/MythTV/ in
> >> Mythbuntu 14.04.
> >
> >You should have a dist-packages for the python 3 library as well. Probably
> >under /usr/lib/python3/dist-packages.
> >
> >If you copy the .py files to that directory, you should get access to the
> >mythtv packages. However, they probably are not installed in python 3 for
> >good reason. The difference between python 2 and 3 is not that big, but I
> >have had to rewrite several packages just to get some packages to work.
> You
> >probably will have to go through the packages and change some syntax and
> so
> >on. However if you do, you could offer to upload your solution to the
> >maintainer of the python packages in mythtv, so that we get python 3
> >support (you could also rewrite them so that python 2 or 3 can be used).
> >
> >I think that changing to python 3 will not happen in the near future
> >however. Python 3 has been around for more than 10 years and the support
> >for it is unfortunately rather bad still. As you have mentioned Python 3
> >support is being favoured by the ubuntu distributions, but we will still
> >need support for Python 2 for a long time.
> >
> >Regards,
> >
> >Andréas
>
> No, I think you are wrong about that.  Python 2 is now deprecated by
> Python - there are no more updates going to be done for Python 2
> (although there will be bug fixes).  So Python 2.7 is the last version
> of Python 2.  All support is now for Python 3 only going forwards.
>
>   http://legacy.python.org/dev/peps/pep-0373/
>
> So Ubuntu is just preparing for that change, not leading the way.
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>

I stand corrected. Great news to hear that python 2 will be deprecated.
However the problem still stands. Working as a django developer, we just
made the switch to Python 3 this summer. Most of the plugins we use are
only maintained in python 2, even the most basic things like database
adapters are still mostly python 2. Until the community embraces python 3
(which I think it should), there will still be problems with python 3
adoption.

Regards,

Andréas
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