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[FB] [PI-3394] Unify saving behaviour of "unknown" and "no_unit"#3711

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pp-mo merged 3 commits intoSciTools:default_unitsfrom
stephenworsley:saving_null_units
Jun 1, 2020
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[FB] [PI-3394] Unify saving behaviour of "unknown" and "no_unit"#3711
pp-mo merged 3 commits intoSciTools:default_unitsfrom
stephenworsley:saving_null_units

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@stephenworsley stephenworsley commented May 18, 2020

Adresses #3394.

@pp-mo pp-mo mentioned this pull request May 29, 2020
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pp-mo commented May 29, 2020 •
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I think it might be a good idea to replace
unit not in ("no_unit", "unknown")
here, with
not unit.is_udunits().

That does seem to have the same effect, but I'm still not totally sure that is a correct equivalent meaning, according to what we want and what cf-units means by it.
I'll report back after looking into the implementation within cf-units...

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pp-mo commented Jun 1, 2020 •
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replace unit not in ("no_unit", "unknown") with not unit.is_udunits()

After some reading up, I conclude that I think this is a good idea.

The cf_units docs for the 'category' property explain that it currently comprises types "udunints, no-units and unknown" : https://scitools.org.uk/cf-units/docs/latest/unit.html#cf_units.Unit.category

From reading the code,

unit.isudunits() 
  === unit.category = _CATEGORY_UDUNIT
  === unit.ut_unit is not _ud.NULL_UNIT

It also has specific category methods is_unknown() and is_no_unit()

So, I think that makes sense.

However I must admit that the case ins undermined by some confusion about what is really public API. E.G. cf_units does not publish the category values, _CATEGORY_UDUNITS etc, despite the Unit.category being pubic property. etc.
I'm guessing that is just some kind of slip. Likewise, why don't they publish '_UNKNOWN_UNIT_STRING' and the like ...

@pp-mo pp-mo merged commit 912f500 into SciTools:default_units Jun 1, 2020
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pp-mo commented Jun 1, 2020

Thanks for humouring me !
The more I think, the more this makes sense to me : The objects' ".units" are cf_unit objects, but not all cf_units are valid udunits : so, they only get saved if they are.

@pp-mo pp-mo added this to the v3.0.0 milestone Jun 3, 2020
@abooton abooton changed the title Unify saving behaviour of "unknown" and "no_unit" Pi-3394: Unify saving behaviour of "unknown" and "no_unit" Jun 3, 2020
@abooton abooton changed the title Pi-3394: Unify saving behaviour of "unknown" and "no_unit" PI-3394: Unify saving behaviour of "unknown" and "no_unit" Jun 3, 2020
stephenworsley added a commit to stephenworsley/iris that referenced this pull request Jun 8, 2020
@stephenworsley
Merge branch 'default_units' of https://github.com/SciTools/iris into…
4f267ad 
… default_units_patch

* 'default_units' of https://github.com/SciTools/iris:
  Unify saving behaviour of "unknown" and "no_unit" (SciTools#3711)
  Change default loading unit from "1" to "unknown" (correct branch) (SciTools#3709)
  Change default units to "unknown" for all DimensionalMetadata (SciTools#3713)
  Update docs CubeList.extract method (SciTools#3694)
  Correct and improve dev-guide section on fixing graphics-tests. (SciTools#3683)
  New image hashes for mpl 3x2 (SciTools#3682)
  Switched use of datetime.weekday() to datetime.dayofwk. (SciTools#3687)
  Remove TestGribMessage (SciTools#3672)
  Removed iris.tests.integration.test_grib_load and related CML files. (SciTools#3670)
  Removed grib-specific test to iris-grib. (SciTools#3671)
  Fixed asv project name to 'scitools-iris'. (SciTools#3660)
  Remove cube iter (SciTools#3656)
  Remove test_grib_save.py (SciTools#3669)
  Remove test_grib2 integration tests (SciTools#3664)
  Remove uri callback test which is moved to iris-grib (SciTools#3665)
  2v4 mergeback picks (SciTools#3668)
  Remove test_grib_save_rules.py which has been moved to iris-grib (SciTools#3666)
  Removed ununused skipIf. (SciTools#3632)
  Remove grib-specific test. (SciTools#3663)
  Remove obsolete test. (SciTools#3662)
abooton added a commit to abooton/iris that referenced this pull request Jun 10, 2020
@abooton
Updating default_units to base a07800c
6c3832e 
Squashed commit of the following:

commit 912f500
Author: stephenworsley <49274989+stephenworsley@users.noreply.github.com>
Date:   Mon Jun 1 17:52:42 2020 +0100

    Unify saving behaviour of "unknown" and "no_unit" (SciTools#3711)

commit 3171b95
Author: stephenworsley <49274989+stephenworsley@users.noreply.github.com>
Date:   Mon Jun 1 16:28:45 2020 +0100

    Change default loading unit from "1" to "unknown" (correct branch) (SciTools#3709)

commit 3fdccac
Author: stephenworsley <49274989+stephenworsley@users.noreply.github.com>
Date:   Mon Jun 1 12:27:23 2020 +0100

    Change default units to "unknown" for all DimensionalMetadata (SciTools#3713)
abooton added a commit to abooton/iris that referenced this pull request Jun 10, 2020
@abooton
Updating default_units to base a07800c
6a924b7 
Squashed commit of the following:

commit 912f500
Author: stephenworsley <49274989+stephenworsley@users.noreply.github.com>
Date:   Mon Jun 1 17:52:42 2020 +0100

    Unify saving behaviour of "unknown" and "no_unit" (SciTools#3711)

commit 3171b95
Author: stephenworsley <49274989+stephenworsley@users.noreply.github.com>
Date:   Mon Jun 1 16:28:45 2020 +0100

    Change default loading unit from "1" to "unknown" (correct branch) (SciTools#3709)

commit 3fdccac
Author: stephenworsley <49274989+stephenworsley@users.noreply.github.com>
Date:   Mon Jun 1 12:27:23 2020 +0100

    Change default units to "unknown" for all DimensionalMetadata (SciTools#3713)
@abooton abooton changed the title PI-3394: Unify saving behaviour of "unknown" and "no_unit" [FB] [PI-3394] Unify saving behaviour of "unknown" and "no_unit" Jun 10, 2020
abooton added a commit to abooton/iris that referenced this pull request Aug 19, 2020
@abooton
Merge remote-tracking branch 'upstream/default_units' into default_un…
c3a3163 
…its_merge

* upstream/default_units:
  fix test (SciTools#3732)
  Unify saving behaviour of "unknown" and "no_unit" (SciTools#3711)
  Change default loading unit from "1" to "unknown" (correct branch) (SciTools#3709)
  Change default units to "unknown" for all DimensionalMetadata (SciTools#3713)
trexfeathers pushed a commit that referenced this pull request Aug 19, 2020
@abooton @stephenworsley
Update default_units feature branch base1873ce14 (#3792)
e99f960 
* Change default units to "unknown" for all DimensionalMetadata (#3713)

* Change default loading unit from "1" to "unknown" (correct branch) (#3709)

* Unify saving behaviour of "unknown" and "no_unit" (#3711)

* fix test (#3732)

Co-authored-by: stephenworsley <49274989+stephenworsley@users.noreply.github.com>
stephenworsley added a commit that referenced this pull request Aug 20, 2020
@abooton @stephenworsley
Merge "default_units" feature branch (#3795)
42a1964 
* Change default units to "unknown" for all DimensionalMetadata (#3713)

* Change default loading unit from "1" to "unknown" (correct branch) (#3709)

* Unify saving behaviour of "unknown" and "no_unit" (#3711)

* fix test (#3732)

Co-authored-by: stephenworsley <49274989+stephenworsley@users.noreply.github.com>
This was referenced Aug 21, 2020
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@pp-mo pp-mo mentioned this pull request Jul 7, 2023
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