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  • Attribute style access is slow · 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
752674453 https://github.com/pydata/xarray/issues/4741#issuecomment-752674453 https://api.github.com/repos/pydata/xarray/issues/4741 MDEyOklzc3VlQ29tbWVudDc1MjY3NDQ1Mw== rhkleijn 32801740 2020-12-30T16:06:45Z 2020-12-30T16:06:45Z CONTRIBUTOR

With some modest refactoring in https://github.com/rhkleijn/xarray/tree/faster-attr-access I managed to speed up attribute style access, dir() and _ipython_key_completions_ (in this case ~100 fold) by using a more lazy approach and especially avoiding the eager {d: self[d] for d in self.dims} which constructs many (mostly unneeded) DataArray objects.

``` %timeit ds.var0 468 µs ± 1.96 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

%timeit dir(ds) 499 µs ± 1.51 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

%timeit ds.ipython_key_completions() 242 µs ± 1.03 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each) ```

Shall I open a pull request for this?

 
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   Attribute style access is slow 776520994

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