issues: 2052952379
This data as json
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2052952379 | I_kwDOAMm_X856XZE7 | 8568 | Raise when assigning attrs to virtual variables (default coordinate arrays) | 2448579 | open | 0 | 0 | 2023-12-21T19:24:11Z | 2023-12-21T19:24:19Z | MEMBER | Discussed in https://github.com/pydata/xarray/discussions/8567
<sup>Originally posted by **matthew-brett** December 21, 2023</sup>
Sorry for the introductory question, but we (@ivanov and I) ran into this behavior while experimenting:
```python
import numpy as np
data = np.zeros((3, 4, 5))
ds = xr.DataArray(data, dims=('i', 'j', 'k'))
print(ds['k'].attrs)
```
This shows `{}` as we might reasonably expect. But then:
```python
ds['k'].attrs['foo'] = 'bar'
print(ds['k'].attrs)
```
This also gives `{}`, which we found surprising. We worked out why that was, after a little experimentation (the default coordinate arrays seems to get created on the fly and garbage collected immediately). But it took us a little while. Is that as intended? Is there a way of making this less confusing?
Thanks for any help. |
{
"url": "https://api.github.com/repos/pydata/xarray/issues/8568/reactions",
"total_count": 1,
"+1": 1,
"-1": 0,
"laugh": 0,
"hooray": 0,
"confused": 0,
"heart": 0,
"rocket": 0,
"eyes": 0
} |
13221727 | issue |