[mythtv] Is MythTV ready for Python 3.9?

Roland Ernst rcrernst at gmail.com
Mon Jun 22 18:11:15 UTC 2020


On Sun, Jun 21, 2020 at 7:19 PM Bill Meek <keemllib at gmail.com> wrote:

>
>
> Ansible works OK now. The only error I'm seeing with the
> Python bindings in 3.9 is:
>
>    File "/usr/local/lib/python3.9/site-packages/MythTV/dataheap.py", line
> 18, in <module>
>      import xml.etree.cElementTree as etree
> ModuleNotFoundError: No module named 'xml.etree.cElementTree'
>
> There's a simple solution, but is cElementTree an
> example of something that will show up in the
> future? Any script that uses: from MythTV import MythDB
> will fail.
>
> --
> Bill
>
>
That's not the only error:
Python3.9 moved the 'Abstract Base Classes' from 'collections' to
'collections.abc'.
Affected grabber modules:
  - tmdb.py
  - tvdb.py
The classes 'Sequence', 'Iterator', 'Iterable' are now members of
'collections.abc'

The module 'xml' removed the methods 'getchildren()' and other methods.
I need to check if pythons 'lxml' module does the same.

I will set up a 'Python Virtual Environment' for Python3.9 with the modules
selected for fedora33:
 - python3-mysqlclient-1.4.6-2.fc33.x86_64.rpm
 - python3-lxml-4.5.1-1.fc33.x86_64.rpm
 - python3-requests-2.23.0-4.fc33.noarch.rpm
 - python3-requests-cache-0.5.1-5.fc33.noarch.rpm
 - python3-future-0.18.2-6.fc33.noarch.rpm
 - python3-simplejson-3.17.0-4.fc33.x86_64.rpm
 - python3-urllib3-1.25.8-3.fc33.noarch.rpm
and run my tests with it.

See the bug tacker for python3 at fedora at
https://bugzilla.redhat.com/show_bug.cgi?id=1785415
for the changes the fedora maintainers raised: It's quite a lot that broke.

BTW: Though 'xml.etree.cElementTree' was deprecated for a long time, it
never raised a
'deprecation warning' in my tests. Therefore, it is hard to find it up
front.

Roland
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