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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
464717028 MDU6SXNzdWU0NjQ3MTcwMjg= 3081 Method chaining on magic methods? hsharrison 4441865 closed 0     2 2019-07-05T17:02:44Z 2019-07-09T19:28:11Z 2019-07-09T19:28:11Z CONTRIBUTOR      

Apologies if this has been discussed, I couldn't find it.

In pandas and xarray I prefer a method-chaining style, and with pandas this is now very well supported. However, xarray is missing a number of simple methods. I often find myself having to use magic methods like __eq__ directly to avoid breaking the chain. Is there any reason not to do

class DataArray:
    ...
    eq = __eq__
    gt = __gt__
    ge = __ge__
    lt = __lt__
    le = __le__
    add = __add__
    subtract = __sub__
    multiply = __mul__
    divide = __div__
    pow = __pow__
    # etc.

Probably it is more complicated than this, but hopefully it communicates the idea.

 
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   completed xarray 13221727 issue
209854706 MDExOlB1bGxSZXF1ZXN0MTA3NjkxMzM0 1286 add assign_attrs method hsharrison 4441865 closed 0     1 2017-02-23T19:09:32Z 2017-03-07T19:35:09Z 2017-03-07T19:35:03Z CONTRIBUTOR   0 pydata/xarray/pulls/1286
  • [x] closes #1281
  • [x] tests added / passed
  • [x] passes git diff upstream/master | flake8 --diff (except for whatsnew... wasn't sure there)
  • [x] whatsnew entry
 
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     xarray 13221727 pull
209523348 MDU6SXNzdWUyMDk1MjMzNDg= 1281 update_attrs method hsharrison 4441865 closed 0     6 2017-02-22T17:23:51Z 2017-03-07T19:35:03Z 2017-03-07T19:35:03Z CONTRIBUTOR      

Updating attrs is an operation that consistently breaks up my method chaining. This should be easy to solve with something like

def update_attrs(self, *args, **kwargs): self.attrs.update(*args, **kwargs) return self

Thoughts?

edit: I guess it should return a modified object rather than acting as an in-place operation...is copying appropriate here? How is this usually handled?

 
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   completed xarray 13221727 issue

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