updating group type annotation for netcdf, hdf5, and zarr open_datatr…

…ee function (#9614)

* updating group type annotation for netcdf, hdf5, and zarr open_datatree function

* supporting only  in group type annotation for netcdf, hdf5, and zarr open_datatree function

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

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

xarray/backends/h5netcdf_.py

@@ -3,7 +3,7 @@
 import functools
 import io
 import os
-from collections.abc import Callable, Iterable
+from collections.abc import Iterable
 from typing import TYPE_CHECKING, Any
 
 import numpy as np
@@ -465,7 +465,7 @@ def open_datatree(
         use_cftime=None,
         decode_timedelta=None,
         format=None,
-        group: str | Iterable[str] | Callable | None = None,
+        group: str | None = None,
         lock=None,
         invalid_netcdf=None,
         phony_dims=None,
@@ -511,7 +511,7 @@ def open_groups_as_dict(
         use_cftime=None,
         decode_timedelta=None,
         format=None,
-        group: str | Iterable[str] | Callable | None = None,
+        group: str | None = None,
         lock=None,
         invalid_netcdf=None,
         phony_dims=None,

xarray/backends/netCDF4_.py

@@ -3,7 +3,7 @@
 import functools
 import operator
 import os
-from collections.abc import Callable, Iterable
+from collections.abc import Iterable
 from contextlib import suppress
 from typing import TYPE_CHECKING, Any
 
@@ -700,7 +700,7 @@ def open_datatree(
         drop_variables: str | Iterable[str] | None = None,
         use_cftime=None,
         decode_timedelta=None,
-        group: str | Iterable[str] | Callable | None = None,
+        group: str | None = None,
         format="NETCDF4",
         clobber=True,
         diskless=False,
@@ -745,7 +745,7 @@ def open_groups_as_dict(
         drop_variables: str | Iterable[str] | None = None,
         use_cftime=None,
         decode_timedelta=None,
-        group: str | Iterable[str] | Callable | None = None,
+        group: str | None = None,
         format="NETCDF4",
         clobber=True,
         diskless=False,

xarray/backends/zarr.py

@@ -3,7 +3,7 @@
 import json
 import os
 import warnings
-from collections.abc import Callable, Iterable
+from collections.abc import Iterable
 from typing import TYPE_CHECKING, Any
 
 import numpy as np
@@ -1282,7 +1282,7 @@ def open_datatree(
         drop_variables: str | Iterable[str] | None = None,
         use_cftime=None,
         decode_timedelta=None,
-        group: str | Iterable[str] | Callable | None = None,
+        group: str | None = None,
         mode="r",
         synchronizer=None,
         consolidated=None,
@@ -1328,7 +1328,7 @@ def open_groups_as_dict(
         drop_variables: str | Iterable[str] | None = None,
         use_cftime=None,
         decode_timedelta=None,
-        group: str | Iterable[str] | Callable | None = None,
+        group: str | None = None,
         mode="r",
         synchronizer=None,
         consolidated=None,