Add parent info to repr (#59)

* think I've fixed the bug

* used feature from python 3.9

* test but doesn't yet work properly

* only check subtree, not down to root

* add parent info to repr

* trigger CI

Author: TomNicholas

datatree/datatree.py

@@ -223,6 +223,12 @@ def __str__(self):
                     else:
                         lines.append(f"{fill}{line}")
 
+        # Tack on info about whether or not root node has a parent at the start
+        first_line = lines[0]
+        parent = f'"{self.parent.name}"' if self.parent is not None else "None"
+        first_line_with_parent = first_line[:-1] + f", parent={parent})"
+        lines[0] = first_line_with_parent
+
         return "\n".join(lines)
 
     def _single_node_repr(self):
@@ -433,6 +439,8 @@ def isomorphic(
         from_root : bool, optional, default is False
             Whether or not to first traverse to the root of the trees before checking for isomorphism.
             If a & b have no parents then this has no effect.
+        strict_names : bool, optional, default is False
+            Whether or not to also check that each node has the same name as its counterpart.
 
         See Also
         --------

datatree/tests/test_datatree.py

@@ -291,14 +291,14 @@ class TestRepr:
     def test_print_empty_node(self):
         dt = DataTree("root")
         printout = dt.__str__()
-        assert printout == "DataTree('root')"
+        assert printout == "DataTree('root', parent=None)"
 
     def test_print_node_with_data(self):
         dat = xr.Dataset({"a": [0, 2]})
         dt = DataTree("root", data=dat)
         printout = dt.__str__()
         expected = [
-            "DataTree('root')",
+            "DataTree('root', parent=None)",
             "Dimensions",
             "Coordinates",
             "a",