From cbec1ab035a4b4aaca8a102889de59a864b16813 Mon Sep 17 00:00:00 2001
From: John Vincent Cauilan <64677361+johvincau@users.noreply.github.com>
Date: Wed, 10 Jul 2024 17:04:09 -0500
Subject: [PATCH] Correct openmc.Geometry initializer to accept iterables of
 openmc.Cell (#3081)

---
 openmc/geometry.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/openmc/geometry.py b/openmc/geometry.py
index db927c46ec1..e37a69c73d2 100644
--- a/openmc/geometry.py
+++ b/openmc/geometry.py
@@ -41,7 +41,7 @@ class Geometry:
 
     def __init__(
         self,
-        root: typing.Optional[openmc.UniverseBase] = None,
+        root: openmc.UniverseBase | typing.Iterable[openmc.Cell] | None = None,
         merge_surfaces: bool = False,
         surface_precision: int = 10
     ):