[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

xarray/backends/api.py

@@ -1926,14 +1926,13 @@ def to_netcdf(
         if engine is None:
             engine = _get_default_engine(path_or_file)
         path_or_file = _normalize_path(path_or_file)
-    else:  # file-like object
-        if engine not in ("scipy", "h5netcdf"):
-            emit_user_level_warning(
-                f"Requested {engine=} is not compatible with writing to a file-like object. "
-                "This will raise an error in the future, for now defaulting to engine='scipy'.",
-                FutureWarning,
-            )
-            engine = "scipy"
+    elif engine not in ("scipy", "h5netcdf"):
+        emit_user_level_warning(
+            f"Requested {engine=} is not compatible with writing to a file-like object. "
+            "This will raise an error in the future, for now defaulting to engine='scipy'.",
+            FutureWarning,
+        )
+        engine = "scipy"
 
     # validate Dataset keys, DataArray names, and attr keys/values
     _validate_dataset_names(dataset)

xarray/core/datatree.py

@@ -3,7 +3,6 @@
 import functools
 import io
 import itertools
-from os import PathLike
 import textwrap
 from collections import ChainMap
 from collections.abc import (
@@ -14,6 +13,7 @@
     Mapping,
 )
 from html import escape
+from os import PathLike
 from typing import (
     TYPE_CHECKING,
     Any,

xarray/core/datatree_io.py

@@ -1,9 +1,9 @@
 from __future__ import annotations
 
-from collections.abc import Mapping
 import io
+from collections.abc import Mapping
 from os import PathLike
-from typing import TYPE_CHECKING, Any, Literal, get_args, overload
+from typing import TYPE_CHECKING, Any, Literal, get_args
 
 from xarray.core.datatree import DataTree
 from xarray.core.types import NetcdfWriteModes, ZarrWriteModes
@@ -14,6 +14,7 @@
 if TYPE_CHECKING:
     from xarray.core.types import ZarrStoreLike
 
+
 def _datatree_to_netcdf(
     dt: DataTree,
     filepath: str | PathLike | io.IOBase | None = None,
@@ -37,7 +38,9 @@ def _datatree_to_netcdf(
         raise ValueError("DataTree.to_netcdf only supports the NETCDF4 format")
 
     if engine not in [None, *get_args(T_DataTreeNetcdfEngine)]:
-        raise ValueError("DataTree.to_netcdf only supports the netcdf4 and h5netcdf engines")
+        raise ValueError(
+            "DataTree.to_netcdf only supports the netcdf4 and h5netcdf engines"
+        )
 
     if engine is None:
         engine = "h5netcdf"

xarray/tests/test_backends_datatree.py

@@ -551,13 +551,13 @@ def test_roundtrip_via_bytes_engine_specified(self, simple_datatree):
 
     def test_roundtrip_using_filelike_object(self, tmpdir, simple_datatree):
         original_dt = simple_datatree
-        filepath = tmpdir + '/test.nc'
+        filepath = tmpdir + "/test.nc"
         # h5py requires both read and write access when writing, it will
         # work with file-like objects provided they support both, and are
         # seekable.
-        with open(filepath, 'wb+') as file:
+        with open(filepath, "wb+") as file:
             original_dt.to_netcdf(file, engine=self.engine)
-        with open(filepath, 'rb') as file:
+        with open(filepath, "rb") as file:
             roundtrip_dt = open_datatree(file, engine=self.engine)
             assert_equal(original_dt, roundtrip_dt)