diff --git a/albert/base.py b/albert/base.py
index 79c750a..273ea27 100644
--- a/albert/base.py
+++ b/albert/base.py
@@ -166,7 +166,7 @@ def factory(cls: type[Base], *args: Any, **kwargs: Any) -> Base:
     @property
     def is_leaf(self) -> bool:
         """Get whether the object is a leaf in a tree."""
-        return self.children is None
+        return not bool(self.children)
 
     @property
     def children(self) -> tuple[Base, ...]:
diff --git a/examples/rccsd.py b/examples/codegen_rccsd.py
similarity index 100%
rename from examples/rccsd.py
rename to examples/codegen_rccsd.py