Refactor the area loading internal function

[mraspaud]

This PR adds the possibility to create an area definition from a yaml string. So create_area_def_from_dict and create_area_def_from_yaml utility functions were added.

This PR refactors the area loading a little.

[gerritholl]

How is this different from load_area_from_string?

[mraspaud]

it probably isn't, I wasn't aware it existed :) I'll have a look

[mraspaud]

Sorry about that @gerritholl , I was so sure this didn't exist already. Anyway, I removed the meat of this and just left the small refactoring.

[gerritholl]

Do these lines actually do anything useful for a test module? As far as I know, the first line only matters for commandline scripts and the second is redundant in Python 3?

[mraspaud]

I haven't thought about that tbh. For consistency, maybe we should have a PR just for removing all of these?

[mraspaud]

Or I could do it here...

[djhoese]

We could probably remove them. I've only ever added them for consistency. As a library, we could probably remove the usage of both in all pytroll packages.

[gerritholl]

Looks good to me, just one minor question.

[djhoese]

LGTM

[djhoese]

Regarding the test failures:

This has to do with new versions of setuptools. I would think we should be fine, but obviously things aren't working. It looks like there has been a patch release of setuptools since the last CI run here. It may be worth restarting them @mraspaud but I wanted to see what you thought. I can't tell from the output what version of setuptools was used in the test install. Or I wonder if this requires a new version of versioneer.

[djhoese]

Ah, there was a versioneer release to fix it: https://github.com/python-versioneer/python-versioneer/releases/tag/0.23

[mraspaud]

Updated versioneer, let's see how it goes

[codecov]

Codecov Report

Merging #451 (f44e616) into main (df76244) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #451   +/-   ##
=======================================
  Coverage   94.28%   94.28%           
=======================================
  Files          68       69    +1     
  Lines       12361    12369    +8     
=======================================
+ Hits        11654    11662    +8     
  Misses        707      707           

Flag	Coverage Δ
unittests	94.28% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyresample/test/test_utils.py	100.00% <ø> (ø)
pyresample/area_config.py	90.65% <100.00%> (+0.10%)	⬆️
pyresample/test/test_area_config.py	100.00% <100.00%> (ø)

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[coveralls]

Coverage increased (+0.004%) to 94.129% when pulling f44e616 on mraspaud:feature-area-def-from-yaml into df76244 on pytroll:main.