Unnecessary generator

xarray/core/indexes.py

@@ -768,10 +768,12 @@ def concat(
 
         if not indexes:
             coord_dtype = None
-        elif len(set(idx.coord_dtype for idx in indexes)) == 1:
-            coord_dtype = indexes[0].coord_dtype
         else:
-            coord_dtype = np.result_type(*[idx.coord_dtype for idx in indexes])
+            indexes_coord_dtypes = {idx.coord_dtype for idx in indexes}
+            if len(indexes_coord_dtypes) == 1:
+                coord_dtype = next(iter(indexes_coord_dtypes))
+            else:
+                coord_dtype = np.result_type(*indexes_coord_dtypes)
 
         return cls(new_pd_index, dim=dim, coord_dtype=coord_dtype)
 

xarray/core/treenode.py

@@ -752,7 +752,7 @@ def relative_to(self: NamedNode, other: NamedNode) -> str:
             )
 
         this_path = NodePath(self.path)
-        if other.path in list(parent.path for parent in (self, *self.parents)):
+        if any(other.path == parent.path for parent in (self, *self.parents)):
             return str(this_path.relative_to(other.path))
         else:
             common_ancestor = self.find_common_ancestor(other)

xarray/groupers.py

@@ -617,10 +617,10 @@ def season_to_month_tuple(seasons: Sequence[str]) -> tuple[tuple[int, ...], ...]
     ((12, 1, 2, 3), (9, 10, 11, 12))
     """
     initials = "JFMAMJJASOND"
-    starts = dict(
-        ("".join(s), i + 1)
+    starts = {
+        "".join(s): i + 1
         for s, i in zip(sliding_window(2, initials + "J"), range(12), strict=True)
-    )
+    }
     result: list[tuple[int, ...]] = []
     for i, season in enumerate(seasons):
         if len(season) == 1: