From b11f8b73ca3a53913d75846562c4a4457076a1ef Mon Sep 17 00:00:00 2001
From: John Vincent Cauilan <64677361+johvincau@users.noreply.github.com>
Date: Mon, 8 Jul 2024 09:37:17 -0500
Subject: [PATCH] Enforce sequence type when setting Setting.track (#3071)

---
 openmc/settings.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/openmc/settings.py b/openmc/settings.py
index b048c3a8b34..9731f54ecb1 100644
--- a/openmc/settings.py
+++ b/openmc/settings.py
@@ -1,4 +1,4 @@
-from collections.abc import Iterable, Mapping, MutableSequence
+from collections.abc import Iterable, Mapping, MutableSequence, Sequence
 from enum import Enum
 import itertools
 from math import ceil
@@ -819,7 +819,7 @@ def track(self) -> typing.Iterable[typing.Iterable[int]]:
 
     @track.setter
     def track(self, track: typing.Iterable[typing.Iterable[int]]):
-        cv.check_type('track', track, Iterable)
+        cv.check_type('track', track, Sequence)
         for t in track:
             if len(t) != 3:
                 msg = f'Unable to set the track to "{t}" since its length is not 3'