issues: 132774456

This data as json

id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
132774456 MDU6SXNzdWUxMzI3NzQ0NTY= 757 Ordered Groupby Keys 2443309 open 0     6 2016-02-10T18:05:08Z 2019-11-20T16:12:41Z   MEMBER      

The current behavior of the xarray's Groupby.groups property provides a standard (unordered) dictionary. This is fine for most cases but leads to odd orderings in use cases like this one where I am using xarray's FacetGrid plotting:

``` Python plot_kwargs = dict(col='season', vmin=15, vmax=35, levels=12, extend='both')

da_obs = ds_obs.SALT.isel(depth=0).groupby('time.season').mean('time') da_obs.plot(**plot_kwargs) ```

Note that MAM and JJA are out of order.

I think this could be easily fixed by using an OrderedDict in xarray.core.Groupby.groups.

 
{
    "url": "https://api.github.com/repos/pydata/xarray/issues/757/reactions",
    "total_count": 0,
    "+1": 0,
    "-1": 0,
    "laugh": 0,
    "hooray": 0,
    "confused": 0,
    "heart": 0,
    "rocket": 0,
    "eyes": 0
}
     13221727 issue

Links from other tables