Slightly improve DataTree repr

xarray/core/formatting.py

@@ -1023,7 +1023,7 @@ def diff_datatree_repr(a: DataTree, b: DataTree, compat):
 
 def _single_node_repr(node: DataTree) -> str:
     """Information about this node, not including its relationships to other nodes."""
-    node_info = f"DataTree('{node.name}')"
+    node_info = f"DataTree(name={node.name!r})"
 
     if node.has_data or node.has_attrs:
         ds_info = "\n" + repr(node.ds)
@@ -1053,8 +1053,8 @@ def datatree_repr(dt: DataTree):
 
     # Tack on info about whether or not root node has a parent at the start
     first_line = lines[0]
-    parent = f'"{dt.parent.name}"' if dt.parent is not None else "None"
-    first_line_with_parent = first_line[:-1] + f", parent={parent})"
+    parent = dt.parent.name if dt.parent is not None else None
+    first_line_with_parent = first_line[:-1] + f", parent={parent!r})"
     lines[0] = first_line_with_parent
 
     return "\n".join(lines)

xarray/tests/test_datatree.py

@@ -623,6 +623,28 @@ def test_operation_with_attrs_but_no_data(self):
         dt.sel(dim_0=0)
 
 
+class TestRepr:
+    def test_repr(self):
+        dt: DataTree = DataTree(
+            data=xr.Dataset({"a": 1}),
+            children={"b": DataTree(), "c": DataTree(xr.Dataset({"d": 2}))},
+        )
+        result = repr(dt)
+        expected = dedent(
+            """\
+            DataTree(name=None, parent=None)
+            │   Dimensions:  ()
+            │   Data variables:
+            │       a        int64 8B 1
+            ├── DataTree(name='b')
+            └── DataTree(name='c')
+                    Dimensions:  ()
+                    Data variables:
+                        d        int64 8B 2"""
+        )
+        assert result == expected
+
+
 class TestRestructuring:
     def test_drop_nodes(self):
         sue = DataTree.from_dict({"Mary": None, "Kate": None, "Ashley": None})