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

[Chris Green]

I have a fairly simple Python program that I wrote a while ago in
Python 2 that transfers images from my camera to a date ordered
directory hierarchy on my computer.

I am trying to get it to work on Python 3 as I have just upgraded to
Ubuntu 20.04 and on that Python 3 is now the default version of Python.

I seem to be descending into a horrible morass of dependencies (or
failed dependencies) when I try to install pyexiv2 (pr py3exiv2) using
pip3.

Can anyone point me at anywhere that might have some documentation
that will help? 

The first problem (it might be the whole problem, I'm not sure) is
which 'pyexiv2' I should be installing, there seem to be several
apparently competing versions and it's not at all clear which is the
most likely to work.  On pypi there's py3exiv2 and pyexiv2 both of
which claim to be for Python 3.  On the http://py3exiv2.tuxfamily.org/
page it states: "py3exiv2 is the Python 3 version of pyexiv2 written
for Python 2, ...", really! no wonder I'm confused.

Essentially I need the python-pyexiv2 package for Ubuntu 20.04 and
it's only available up to 19.10.

-- 
Chris Green
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