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  • shoyer · 4 ✖

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  • Cannot inherit DataArray anymore in 0.7 release · 4 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
303794677 https://github.com/pydata/xarray/issues/728#issuecomment-303794677 https://api.github.com/repos/pydata/xarray/issues/728 MDEyOklzc3VlQ29tbWVudDMwMzc5NDY3Nw== shoyer 1217238 2017-05-24T17:28:21Z 2017-05-24T17:28:21Z MEMBER

Is there a reason inheritance with a different init signature can't be allowed?

No strong reason -- we just didn't really consider (or test) inheritance in the current design. Certainly proposals (and PRs) for a subclassing API would be welcome.

At the very least, a big fat warning in the documentation would be helpful.

http://xarray.pydata.org/en/stable/internals.html#extending-xarray has some related guidance (I agree it could be louder)

 
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   Cannot inherit DataArray anymore in 0.7 release 128980804
193863403 https://github.com/pydata/xarray/issues/728#issuecomment-193863403 https://api.github.com/repos/pydata/xarray/issues/728 MDEyOklzc3VlQ29tbWVudDE5Mzg2MzQwMw== shoyer 1217238 2016-03-08T16:53:15Z 2016-03-08T16:53:15Z MEMBER

@mathieuS87 I'm not quite sure what you mean there. Do you have a suggested alternative?

 
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   Cannot inherit DataArray anymore in 0.7 release 128980804
176488063 https://github.com/pydata/xarray/issues/728#issuecomment-176488063 https://api.github.com/repos/pydata/xarray/issues/728 MDEyOklzc3VlQ29tbWVudDE3NjQ4ODA2Mw== shoyer 1217238 2016-01-29T00:00:08Z 2016-01-29T00:00:08Z MEMBER

@rafa-guedes the __init__ method needs to look like that of DataArray, e.g.,

class NewArray(xr.DataArray): def __init__(self, data, coords=None, dims=None, name=None, attrs=None, encoding=None, fastpath=False): # ...

or even simply:

class NewArray(xr.DataArray): def __init__(self, *args, **kwargs): # ...

 
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   Cannot inherit DataArray anymore in 0.7 release 128980804
175394725 https://github.com/pydata/xarray/issues/728#issuecomment-175394725 https://api.github.com/repos/pydata/xarray/issues/728 MDEyOklzc3VlQ29tbWVudDE3NTM5NDcyNQ== shoyer 1217238 2016-01-27T04:47:50Z 2016-01-27T04:47:50Z MEMBER

This was definitely caused by the refactor of DataArray internals in 0.7.0.

I don't think you were doing anything wrong, per se, it's just that the internal refactor changed what you can do with a subclasses in an unexpected way :(.

On the plus side, the new code should be better about preserving DataArray subclasses -- new DataArrays should be to the same type as parent objects. However, you will need to preserve the signature of DataArray.__init__, or replace the private _replace method on your subclass (I don't recommend this, because it's also definitely private API and not guaranteed to continue to work).

 
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   Cannot inherit DataArray anymore in 0.7 release 128980804

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