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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
1550792876 I_kwDOAMm_X85cbzis 7463 Coordinates not deep copy mgaspary 118520620 open 0     7 2023-01-20T12:45:52Z 2023-02-13T17:47:22Z   NONE      

What happened?

The coordinates are not copied if you perform deepcopy for xarray. This issue was fixed before. I don't see it, for example, in xarray 2022.12.0, but in the latest version the issue is there again.

```python import xarray as xr

xarr1 = xr.DataArray( np.zeros([2]), coords=dict(x=[0.0, 1.0]), # important to use 'float' here! with 'int' it is working fine dims=("x") ) print(xarr1.x.data[0]) # 0.0

xarr2 = xarr1.copy(deep=True) xarr2.x.data[0] = 45 print(xarr1.x.data[0]) # gives 45 ```

Interesting, that if your coordinates are int, then the issue is gone

What did you expect to happen?

```python import xarray as xr

xarr1 = xr.DataArray( np.zeros([2]), coords=dict(x=[0.0, 1.0]), # important to use 'float' here! with 'int' it is working fine dims=("x") ) print(xarr1.x.data[0]) # 0.0

xarr2 = xarr1.copy(deep=True) xarr2.x.data[0] = 45 print(xarr1.x.data[0]) # I expect it to be 0.0 ```

Minimal Complete Verifiable Example

```Python import xarray as xr

xarr1 = xr.DataArray( np.zeros([2]), coords=dict(x=[0.0, 1.0]), # important to use 'float' here! with 'int' it is working fine dims=("x") ) print(xarr1.x.data[0]) # 0.0

xarr2 = xarr1.copy(deep=True) xarr2.x.data[0] = 45 print(xarr1.x.data[0]) # gives 45 ```

MVCE confirmation

  • [X] Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
  • [X] Complete example — the example is self-contained, including all data and the text of any traceback.
  • [X] Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
  • [X] New issue — a search of GitHub Issues suggests this is not a duplicate.

Relevant log output

No response

Anything else we need to know?

No response

Environment

xarray 2023.1.0 python 3.8.10 
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     xarray 13221727 issue

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