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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
1318173644 I_kwDOAMm_X85OkbvM 6827 xarray.concat for datasets fails when object is a child class of Dataset gabicca 33315687 closed 0     6 2022-07-26T12:31:01Z 2023-01-13T17:14:36Z 2023-01-13T17:14:36Z NONE      

What happened?

The following error is thrown:

```

  result = type(datasets[0])(result_vars, attrs=result_attrs)

E TypeError: init() got an unexpected keyword argument 'attrs' ```

This is coming from the change merged as part of this PR: https://github.com/pydata/xarray/pull/6784/files (line 593)

When "datasets" is a list of class objects which are the child of Dataset, type(datasets[0]) will return that class as the type. This class however, doesn't necessary has attrs in its own init, hence the code breaks.

I'm not convinced that this is a correct behaviour, and if you want to initialize the Dataset class, you should revert that line of change.

What did you expect to happen?

Code to run without any errors.

Minimal Complete Verifiable Example

```Python import xarray

class MyDataset(xarray.Dataset): slots = ()

def __init__(self, a, b, c, d=None):
    super().__init__()

    attrs = {
        'at1': b,
        'at2': d
    }

    super().__init__(a, coords=c, attrs=attrs)

if name == 'main': a = { "x": 1, "y": 3 } b = ["x", "y"] c = { "coord1": 0, "coord2": 1 } ds1 = MyDataset(a, b, c) ds2 = MyDataset(a, b, c) ds3 = MyDataset(a, b, c)

xarray.concat([ds1, ds2, ds3], dim="coord1")

```

MVCE confirmation

  • [X] Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
  • [X] Complete example — the example is self-contained, including all data and the text of any traceback.
  • [X] Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
  • [X] New issue — a search of GitHub Issues suggests this is not a duplicate.

Relevant log output

No response

Anything else we need to know?

No response

Environment

xarray==2022.6.0

python: 3.9.12 | packaged by conda-forge | (main, Mar 24 2022, 23:27:05) 

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   completed xarray 13221727 issue

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