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Implement GroupBy.__getitem__ #3691

Merged
merged 5 commits into from
Mar 15, 2021
Merged

Implement GroupBy.__getitem__ #3691

merged 5 commits into from
Mar 15, 2021

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dcherian
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  • Tests added
  • Passes black . && mypy . && flake8
  • Fully documented, including whats-new.rst for all changes and api.rst for new API

Just like the pandas method.

@dcherian dcherian mentioned this pull request Jan 17, 2020
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max-sixty commented Mar 5, 2020 •
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As first glance, could this just be __getitem__?

In [9]: xr.DataArray(np.random.rand(2,3),
            coords=dict(y=list('abb')), dims=list('xy')).groupby('y').groups
Out[9]: {'a': [0], 'b': [1, 2]}

In [10]: xr.DataArray(np.random.rand(2,3),
            coords=dict(y=list('abb')), dims=list('xy')).groupby('y')['a']
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-10-84ace5956c1e> in <module>
----> 1 xr.DataArray(np.random.rand(2,3),coords=dict(y=list('abb')), dims=list('xy')).groupby('y')['a']

TypeError: 'DataArrayGroupBy' object is not subscriptable

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dcherian commented Feb 6, 2021

@max-sixty Changed to __getitem__ I think that's a good idea.

@dcherian dcherian changed the title Implement GroupBy.get_group Implement GroupBy.__getitem__ Feb 6, 2021
max-sixty
max-sixty approved these changes Feb 6, 2021
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Looks great! Thanks!

@dcherian
Merge remote-tracking branch 'upstream/master' into get_group
513ae67 
* upstream/master:
  fix da.pad example for numpy 1.20 (pydata#4865)
  temporarily pin dask (pydata#4873)
@dcherian
fix test name
fe036ae
mathause
mathause approved these changes Feb 19, 2021
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LGTM. I often do dict(groups)[1] but this is more convenient.

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Any objection if I merge this? (I can move the whatsnew entry).

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Please @mathause !

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Ok, let's wait for the tests. I'll merge in a day or two.

@mathause mathause merged commit c7c4aae into pydata:master Mar 15, 2021
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Thanks @dcherian

@dcherian dcherian deleted the get_group branch March 15, 2021 11:49
dcherian added a commit to dcherian/xarray that referenced this pull request Mar 18, 2021
@dcherian
Merge remote-tracking branch 'upstream/master' into rolling-sliding-w…
ed7c1b0 
…indow

* upstream/master:
  Fix regression in decoding large standard calendar times (pydata#5050)
  Fix sticky sidebar responsiveness on small screens (pydata#5039)
  Flexible indexes refactoring notes (pydata#4979)
  add a install xarray step to the upstream-dev CI (pydata#5044)
  Adds Dataset.query() method, analogous to pandas DataFrame.query() (pydata#4984)
  run tests on python 3.9 (pydata#5040)
  Add date attribute to datetime accessor (pydata#4994)
  📚 New theme & rearrangement of the docs (pydata#4835)
  upgrade ci-trigger to the most recent version (pydata#5037)
  GH5005 fix documentation on open_rasterio (pydata#5021)
  GHA for automatically canceling previous CI runs (pydata#5025)
  Implement GroupBy.__getitem__ (pydata#3691)
  conventions: decode unsigned integers to signed if _Unsigned=false (pydata#4966)
  Added support for numpy.bool_ (pydata#4986)
  Add additional str accessor methods for DataArray (pydata#4622)
dcherian added a commit to dcherian/xarray that referenced this pull request Mar 23, 2021
@dcherian
Merge remote-tracking branch 'upstream/master' into rename-map-blocks…
411c7e6 
…-tasks

* upstream/master:
  Fix regression in decoding large standard calendar times (pydata#5050)
  Fix sticky sidebar responsiveness on small screens (pydata#5039)
  Flexible indexes refactoring notes (pydata#4979)
  add a install xarray step to the upstream-dev CI (pydata#5044)
  Adds Dataset.query() method, analogous to pandas DataFrame.query() (pydata#4984)
  run tests on python 3.9 (pydata#5040)
  Add date attribute to datetime accessor (pydata#4994)
  📚 New theme & rearrangement of the docs (pydata#4835)
  upgrade ci-trigger to the most recent version (pydata#5037)
  GH5005 fix documentation on open_rasterio (pydata#5021)
  GHA for automatically canceling previous CI runs (pydata#5025)
  Implement GroupBy.__getitem__ (pydata#3691)
  conventions: decode unsigned integers to signed if _Unsigned=false (pydata#4966)
  Added support for numpy.bool_ (pydata#4986)
  Add additional str accessor methods for DataArray (pydata#4622)
  add polyval to polyfit see also (pydata#5020)
  mention map_blocks in the docstring of apply_ufunc (pydata#5011)
  Switch backend API to v2 (pydata#4989)
  WIP: add new backend api documentation (pydata#4810)
  pin netCDF4=1.5.3 in min-all-deps (pydata#4982)
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@mathause mathause mathause approved these changes

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@dcherian @max-sixty @mathause