`np.fix` on a data array produces `RecursionError: maximum recursion depth exceeded`

[oliviermarti]

What happened?

I've run the very simple following code :

import numpy as np, xarray as xr
print (np.fix(3.0))
aa = xr.DataArray([3.0])
print (np.fix(aa))

First print is OK. Second print generates a very long error message ending with a RecursionError: maximum recursion depth exceeded. See log for details.

What did you expect to happen?

Simply print '3.0' .. :-)

Minimal Complete Verifiable Example

import numpy as np, xarray as xr
print (np.fix(3.0))
aa = xr.DataArray([3.0])
print (np.fix(aa))

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.
• Recent environment — the issue occurs with the latest version of xarray and its dependencies.

Relevant log output

return apply_array_ufunc(func, *args, dask=dask)
  File "/Users/marti/miniforge3/envs/PROD/lib/python3.13/site-packages/xarray/core/computation.py", line 891, in apply_array_ufunc
    return func(*args)
  File "/Users/marti/miniforge3/envs/PROD/lib/python3.13/site-packages/xarray/core/arithmetic.py", line 83, in __array_ufunc__
    return apply_ufunc(
        ufunc,
    ...<8 lines>...
        keep_attrs=_get_keep_attrs(default=True),
    )
  File "/Users/marti/miniforge3/envs/PROD/lib/python3.13/site-packages/xarray/core/computation.py", line 1278, in apply_ufunc
    return apply_array_ufunc(func, *args, dask=dask)
  File "/Users/marti/miniforge3/envs/PROD/lib/python3.13/site-packages/xarray/core/computation.py", line 873, in apply_array_ufunc
    if any(is_chunked_array(arg) for arg in args):
       ~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/marti/miniforge3/envs/PROD/lib/python3.13/site-packages/xarray/core/computation.py", line 873, in <genexpr>
    if any(is_chunked_array(arg) for arg in args):
           ~~~~~~~~~~~~~~~~^^^^^
  File "/Users/marti/miniforge3/envs/PROD/lib/python3.13/site-packages/xarray/namedarray/pycompat.py", line 92, in is_chunked_array
    return is_duck_dask_array(x) or (is_duck_array(x) and hasattr(x, "chunks"))
           ~~~~~~~~~~~~~~~~~~^^^
  File "/Users/marti/miniforge3/envs/PROD/lib/python3.13/site-packages/xarray/namedarray/utils.py", line 90, in is_duck_dask_array
    return is_duck_array(x) and is_dask_collection(x)
                                ~~~~~~~~~~~~~~~~~~^^^
  File "/Users/marti/miniforge3/envs/PROD/lib/python3.13/site-packages/xarray/namedarray/utils.py", line 69, in is_dask_collection
    return is_dask_collection(x)
RecursionError: maximum recursion depth exceeded

Anything else we need to know?

No response

Environment

------------------ commit: None python: 3.13.1 | packaged by conda-forge | (main, Dec 5 2024, 08:44:03) [Clang 18.1.8 ] python-bits: 64 OS: Darwin OS-release: 24.1.0 machine: arm64 processor: arm byteorder: little LC_ALL: None LANG: en_US.UTF-8 LOCALE: ('en_US', 'UTF-8') libhdf5: 1.14.4 libnetcdf: 4.9.2

xarray: 2024.11.0
pandas: 2.2.3
numpy: 2.1.3
scipy: 1.14.1
netCDF4: 1.7.2
pydap: None
h5netcdf: None
h5py: None
zarr: None
cftime: 1.6.4
nc_time_axis: 1.4.1
iris: None
bottleneck: None
dask: 2024.12.0
distributed: 2024.12.0
matplotlib: 3.9.3
cartopy: 0.24.0
seaborn: 0.13.2
numbagg: None
fsspec: 2024.10.0
cupy: None
pint: 0.24.4
sparse: None
flox: None
numpy_groupies: None
setuptools: 75.6.0
pip: 24.3.1
pytest: 8.3.4
mypy: None
IPython: 8.30.0
sphinx: 8.1.3