Modernize

[taldcroft]

Description

This brings cheta up to modern-ish code standards.

• Remove __future__ imports and six imports.
• Latest ruff lint and formatting.
• Format dev_utils files.

Interface impacts

None.

Testing

Unit tests

• Mac

ska3) ➜  cheta git:(modernize) git rev-parse HEAD  
b1b2307738381fa18e02dabf7459f131a3b0056a
(ska3) ➜  cheta git:(modernize) pytest
====================================================== test session starts ======================================================
platform darwin -- Python 3.11.8, pytest-7.4.4, pluggy-1.4.0
rootdir: /Users/aldcroft/git
configfile: pytest.ini
plugins: timeout-2.2.0, anyio-4.3.0
collected 173 items                                                                                                             

cheta/tests/test_comps.py ...........................................................                                     [ 34%]
cheta/tests/test_data_source.py .........                                                                                 [ 39%]
cheta/tests/test_fetch.py ................................                                                                [ 57%]
cheta/tests/test_intervals.py .........................                                                                   [ 72%]
cheta/tests/test_orbit.py .                                                                                               [ 72%]
cheta/tests/test_remote_access.py ......                                                                                  [ 76%]
cheta/tests/test_sync.py ........                                                                                         [ 80%]
cheta/tests/test_units.py ...........                                                                                     [ 87%]
cheta/tests/test_units_reversed.py ...........                                                                            [ 93%]
cheta/tests/test_utils.py ...........                                                                                     [100%]

======================================================= warnings summary ========================================================

Independent check of unit tests by Javier

• OSX

Functional tests

No functional testing.

[taldcroft]

@javierggt - since I (somewhat accidentally) merged #260 into this PR there are unrelated commits now. You can probably just look at the 4 original commits in isolation since they are mostly independent of each other.

[javierggt]

Since we are in the subject of modernization, the Counter class you have here can be replaced with collections.defaultdifct. Instead of:

ref_counter = Counter()

this:

ref_counter =collections.defaultdict(lambda : 0)

but I do not mind the Counter class.

[taldcroft]

I would say using collections.Counter would be an even nicer modern solution. But this whole code is just taken straight from an old activestate recipe and it works. I just wanted to remove the six dependence with the least likelihood of accidentally breaking something.