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/3910#issuecomment-606135881,https://api.github.com/repos/pydata/xarray/issues/3910,606135881,MDEyOklzc3VlQ29tbWVudDYwNjEzNTg4MQ==,5635139,2020-03-30T17:29:36Z,2020-03-30T17:29:36Z,MEMBER,"Yes exactly! And I think in-place might be surprising if it changed the indexes of the left item; i.e. if you got this result from `A += B`:

```python

In [17]:
    ...:
    ...: import numpy as np
    ...: import xarray as xr
    ...:
    ...: n = 5
    ...:
    ...: d1 = np.arange(1, n+1)
    ...: np.random.shuffle(d1)
    ...: A = xr.DataArray(np.ones(n), coords=[('dim', d1)])
    ...:
    ...: d2 = np.arange(n)
    ...: np.random.shuffle(d2)
    ...: B = xr.DataArray(np.ones(n), coords=[('dim', d2)])
    ...:
    ...: A + B
Out[17]:
<xarray.DataArray (dim: 4)>
array([2., 2., 2., 2.])
Coordinates:
  * dim      (dim) int64 3 2 1 4
```

","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,589632313
https://github.com/pydata/xarray/issues/3910#issuecomment-606070776,https://api.github.com/repos/pydata/xarray/issues/3910,606070776,MDEyOklzc3VlQ29tbWVudDYwNjA3MDc3Ng==,5635139,2020-03-30T15:30:26Z,2020-03-30T15:30:26Z,MEMBER,"Thanks in advance @mancellin 

Your comment is almost exactly right. It's that they might not align fully, rather than the shape; i.e. if your example had `range(1,5)` rather than `range(0,4)`, then the array would need to be converted to  float to add a `NaN`. Does that make sense?","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,589632313
https://github.com/pydata/xarray/issues/3910#issuecomment-605501583,https://api.github.com/repos/pydata/xarray/issues/3910,605501583,MDEyOklzc3VlQ29tbWVudDYwNTUwMTU4Mw==,5635139,2020-03-28T18:38:01Z,2020-03-28T18:41:52Z,MEMBER,"Yes, this is unfortunate. The reasoning: https://github.com/pydata/xarray/blob/732b6cd6248ce715da74f3cd7a0e211eaa1d0aa2/xarray/core/dataarray.py#L2618-L2621

It may be possible to at align in some cases (e.g. if the indexes are bijective / one-to-one, or the values are already floats). Or a better error message; even one containing that comment would be better.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,589632313