html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/3582#issuecomment-559860016,https://api.github.com/repos/pydata/xarray/issues/3582,559860016,MDEyOklzc3VlQ29tbWVudDU1OTg2MDAxNg==,17710617,2019-11-29T18:24:49Z,2019-11-29T18:24:49Z,CONTRIBUTOR,"Ok thanks for the recommandations.

I'm thinking of using this kind of class to handle object creation:

```python
import xarray as xr
import motion


class Analogs:
    def __new__(cls, ...):
        array = xr.DataArray(...)
        cls.verify(array)
        return array

    @staticmethod
    def verify(array):
        print(""verification..."")

    @classmethod
    def from_csv(cls, filename:str, ...):
        array = xr.DataArray(filename, ...)
        cls.verify(array)
        return array
```

Let's say I define another `Markers` class for another type of data. 
Is it possible that my accessor exposes different functions according to class e, g:

```python
@xr.register_dataarray_accessor(""foo"")
class DataArrayAccessor(object):
    def __init__(self, xarray_obj: xr.DataArray):
        self._obj = xarray_obj

    def to_csv(self):
        """"""
        This function is exposed to all objects
        but behave differently if it is a Markers or an Analogs
        """"""

    def marker_only_function(self):
        """"""
        This function is only exposed to 
        array created with the Marker class
        """"""

    def analog_only_function(self):
        """"""
        This function is only exposed to
        array created with the Analog class
        """"""
```

My ultimate goal is to have this kind of API:

```python
analogs = (
    Analogs.from_csv(""filename.csv"")
    .foo.center()    # foo accessor generic method
    .foo.rectify()   # foo accessor specific method for Analogs object
    .mean()          # xarray method
)
```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,530062582
https://github.com/pydata/xarray/issues/3582#issuecomment-559607756,https://api.github.com/repos/pydata/xarray/issues/3582,559607756,MDEyOklzc3VlQ29tbWVudDU1OTYwNzc1Ng==,17710617,2019-11-28T21:44:08Z,2019-11-28T21:44:08Z,CONTRIBUTOR,"> Is it because you would need a hook that is triggered by DataArray. __init__

Yes, I need to test some properties when creating the `DataArray` such as shape and dimensions properties.

> Why can't you initialise whatever you need to upon first access?

How do you do that?","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,530062582