xarray throws FutureWarning when using .interp method

[pnsaevik]

What happened?

I get a FutureWarning when using the .interp method on an xarray.DataArray

The issue is probably related to #6625, #5721 and #6195.

Steps to reproduce

1. conda create -n test xarray scipy
2. conda activate test
3. python -c "import xarray; xarray.DataArray([1., 2.]).interp(dim_0=0.5)"

Expected output

Nothing

Actual output

C:\Miniconda3\envs\test\lib\site-packages\xarray\core\missing.py:562: FutureWarning: Passing method to Int64Index.get_loc is deprecated and will raise in a future version. Use index.get_indexer([item], method=...) instead.
imin = index.get_loc(minval, method="nearest")
C:\Miniconda3\envs\test\lib\site-packages\xarray\core\missing.py:563: FutureWarning: Passing method to Int64Index.get_loc is deprecated and will raise in a future version. Use index.get_indexer([item], method=...) instead.
imax = index.get_loc(maxval, method="nearest")

What did you expect to happen?

I expected no warning

Minimal Complete Verifiable Example

import xarray
xarray.DataArray([1., 2.]).interp(dim_0=0.5)

MVCE confirmation

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

Relevant log output

C:\Miniconda3\envs\test\lib\site-packages\xarray\core\missing.py:562: FutureWarning: Passing method to Int64Index.get_loc is deprecated and will raise in a future version. Use index.get_indexer([item], method=...) instead.
  imin = index.get_loc(minval, method="nearest")
C:\Miniconda3\envs\test\lib\site-packages\xarray\core\missing.py:563: FutureWarning: Passing method to Int64Index.get_loc is deprecated and will raise in a future version. Use index.get_indexer([item], method=...) instead.
  imax = index.get_loc(maxval, method="nearest")

Anything else we need to know?

No response

Environment

C:\Miniconda3\envs\test\lib\site-packages\_distutils_hack\__init__.py:33: UserWarning: Setuptools is replacing distutils.
  warnings.warn("Setuptools is replacing distutils.")

INSTALLED VERSIONS
------------------
commit: None
python: 3.10.6 | packaged by conda-forge | (main, Oct  7 2022, 20:14:50) [MSC v.1916 64 bit (AMD64)]
python-bits: 64
OS: Windows
OS-release: 10
machine: AMD64
processor: Intel64 Family 6 Model 158 Stepping 9, GenuineIntel
byteorder: little
LC_ALL: None
LANG: None
LOCALE: ('Norwegian Bokmål_Norway', '1252')
libhdf5: None
libnetcdf: None

xarray: 0.20.1
pandas: 1.4.4
numpy: 1.23.1
scipy: 1.9.1
netCDF4: None
pydap: None
h5netcdf: None
h5py: None
Nio: None
zarr: None
cftime: None
nc_time_axis: None
PseudoNetCDF: None
rasterio: None
cfgrib: None
iris: None
bottleneck: 1.3.5
dask: None
distributed: None
matplotlib: None
cartopy: None
seaborn: None
numbagg: None
fsspec: None
cupy: None
pint: None
sparse: None
setuptools: 63.4.1
pip: 22.2.2
conda: None
pytest: None
IPython: None
sphinx: None

[keewis]

As far as I remember we fixed this in a more recent version. Can you try upgrading xarray?

[pnsaevik]

I thought I got the newest version of xarray when creating a conda environment from scratch. I see now that this is not the case. Sorry about that!

Upgrading xarray using pip instead of conda fixed the issue.