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  • rhkleijn · 1 ✖

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  • xarray.concat for datasets fails when object is a child class of Dataset · 1 ✖

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  • CONTRIBUTOR · 1 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1195752253 https://github.com/pydata/xarray/issues/6827#issuecomment-1195752253 https://api.github.com/repos/pydata/xarray/issues/6827 IC_kwDOAMm_X85HRbs9 rhkleijn 32801740 2022-07-26T17:10:02Z 2022-07-26T18:15:38Z CONTRIBUTOR

In the example the naming and meaning of the arguments of the __init__ method are different from the Dataset base class.

Subclassing is often more reliable when it adheres to the Liskov Substitution Principle which states that objects of a superclass should be replaceable with objects of its subclasses and in other words: a subclass should only add functionality and not reduce it.

There are some other workarounds though:

If all you need is a convenient custom constructor then you could add a classmethod factory method to your subclass or even just use a plain function which returns a Dataset.

Another option is to convert your MyDataset instances to plain Dataset instances before passing them into xarray.concat, e.g. xarray.concat([ds.to_dataset() for ds in [ds1, ds2, ds3]], dim="coord1")

where your subclass may define as a convenience method: ``` def to_dataset(self): """Convert to plain Dataset.""" return xarray.Dataset(self, attrs=self.attrs) ````

 
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   xarray.concat for datasets fails when object is a child class of Dataset 1318173644

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