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611501372 https://github.com/pydata/xarray/issues/1519#issuecomment-611501372 https://api.github.com/repos/pydata/xarray/issues/1519 MDEyOklzc3VlQ29tbWVudDYxMTUwMTM3Mg== dcherian 2448579 2020-04-09T12:29:53Z 2020-04-09T12:29:53Z MEMBER

How does this even work? :scream:

 
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   Assignment 252490115
611480620 https://github.com/pydata/xarray/issues/1519#issuecomment-611480620 https://api.github.com/repos/pydata/xarray/issues/1519 MDEyOklzc3VlQ29tbWVudDYxMTQ4MDYyMA== keewis 14808389 2020-04-09T11:34:57Z 2020-04-09T11:34:57Z MEMBER

since it came up in #3939, I played around with this, and it seems the obj.sel(x=1)[...] = 0 syntax only works for DataArray objects and when assigning a single value. Should we try to make it work the same way as loc?

 
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   Assignment 252490115
604553156 https://github.com/pydata/xarray/issues/1519#issuecomment-604553156 https://api.github.com/repos/pydata/xarray/issues/1519 MDEyOklzc3VlQ29tbWVudDYwNDU1MzE1Ng== keewis 14808389 2020-03-26T17:07:42Z 2020-03-26T17:50:49Z MEMBER

it's not that it fails, the original dataset is just not updated: ```python In [2]: ds = xr.Dataset({ ...: "a": ("x", np.arange(4)), ...: "b": ("x", np.arange(4)), ...: })

In [3]: selected = ds.loc[{"x": 1}] ...: selected["a"] = 10 ...: ds, selected Out[3]: (<xarray.Dataset> Dimensions: (x: 4) Dimensions without coordinates: x Data variables: a (x) int64 0 1 2 3 b (x) int64 0 1 2 3, <xarray.Dataset> Dimensions: () Data variables: a int64 10 b int64 1) to make it work, use (note the `[...]`)python In [7]: selected = ds.loc[{"x": 1}] ...: selected["a"][...] = 10 ...: ds, selected Out[7]: (<xarray.Dataset> Dimensions: (x: 4) Dimensions without coordinates: x Data variables: a (x) int64 0 10 2 3 b (x) int64 0 1 2 3, <xarray.Dataset> Dimensions: () Data variables: a int64 10 b int64 1) `` The difference is that without the extra[...]we don't modify the values but instead create a new variable (so something likeds["new_variable"] = ("x", [1, 3, 4, 5])`)

Also note that while ds.a.sel(x=1) = 10 raises a SyntaxError, ds.a.sel(x=1)[...] = 10 or ds.sel(x=1).a[...] = 10 have exactly the same effect as their loc counterparts.

We probably should add an explanation and examples to the documentation (loc / sel and maybe the indexing page?)

 
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   Assignment 252490115
604562843 https://github.com/pydata/xarray/issues/1519#issuecomment-604562843 https://api.github.com/repos/pydata/xarray/issues/1519 MDEyOklzc3VlQ29tbWVudDYwNDU2Mjg0Mw== keewis 14808389 2020-03-26T17:24:20Z 2020-03-26T17:24:20Z MEMBER

also, we can't really raise only for ds.loc[...][name] = -1 since for python that is the same as python intermediate_ds = ds.loc[...] intermediate_ds[name] = -1 where the second line is something we explicitly want to support.

 
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   Assignment 252490115

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