Revert "Vendor kerchunk netCDF3 reader (#397)"

This reverts commit 95fce11.

docs/releases.rst

@@ -63,8 +63,6 @@ Documentation
 Internal Changes
 ~~~~~~~~~~~~~~~~
 
-- Vendor netCDF3 reader from kerchunk. (:pull:`397`) By `Tom Nicholas <https://github.com/TomNicholas>`_.
-
 .. _v1.2.0:
 
 v1.2.0 (5th Dec 2024)

virtualizarr/readers/netcdf3.py

@@ -26,7 +26,7 @@ def open_virtual_dataset(
         virtual_backend_kwargs: Optional[dict] = None,
         reader_options: Optional[dict] = None,
     ) -> Dataset:
-        from virtualizarr.vendor.kerchunk.netCDF3 import NetCDF3ToZarr
+        from kerchunk.netCDF3 import NetCDF3ToZarr
 
         if virtual_backend_kwargs:
             raise NotImplementedError(
@@ -38,9 +38,6 @@ def open_virtual_dataset(
             loadable_variables,
         )
 
-        if reader_options is None:
-            reader_options = {}
-
         refs = NetCDF3ToZarr(filepath, inline_threshold=0, **reader_options).translate()
 
         # both group=None and group='' mean to read root group

virtualizarr/tests/test_readers/conftest.py

@@ -1,4 +1,3 @@
-import pathlib
 import warnings
 
 import h5py  # type: ignore
@@ -323,13 +322,3 @@ def root_coordinates_hdf5_file(tmpdir, np_uncompressed_int16):
     f.create_dataset(name="lon", data=data)
     f.attrs.create(name="coordinates", data="lat lon")
     return filepath
-
-
-@pytest.fixture
-def netcdf3_file(tmp_path: pathlib.Path) -> pathlib.Path:
-    ds = xr.Dataset({"foo": ("x", np.array([1, 2, 3]))})
-
-    filepath = tmp_path / "file.nc"
-    ds.to_netcdf(filepath, format="NETCDF3_CLASSIC")
-
-    return filepath