Apply ruff/flake8-simplify rule SIM910

SIM910 Use `.get(...)` instead of `.get(..., None)`

Author: DimitriPapadopoulos

xarray/core/indexes.py

@@ -1247,7 +1247,7 @@ def create_variables(
                 level = name
                 dtype = self.level_coords_dtype[name]  # type: ignore[index]  # TODO: are Hashables ok?
 
-            var = variables.get(name, None)
+            var = variables.get(name)
             if var is not None:
                 attrs = var.attrs
                 encoding = var.encoding

xarray/structure/merge.py

@@ -300,7 +300,7 @@ def merge_collected(
                 variables = [variable for variable, _ in elements_list]
                 try:
                     merged_vars[name] = unique_variable(
-                        name, variables, compat, equals.get(name, None)
+                        name, variables, compat, equals.get(name)
                     )
                 except MergeError:
                     if compat != "minimal":

xarray/tests/test_units.py

@@ -234,9 +234,7 @@ def convert_units(obj, to):
     elif isinstance(obj, xr.DataArray):
         name = obj.name
 
-        new_units = (
-            to.get(name, None) or to.get("data", None) or to.get(None, None) or None
-        )
+        new_units = to.get(name) or to.get("data") or to.get(None) or None
         data = convert_units(obj.variable, {None: new_units})
 
         coords = {