From d5cdf52b8460004c2266cc40c59fbaec24b13d5a Mon Sep 17 00:00:00 2001
From: Markus Rosenstihl <markus.rosenstihl@pkm.tu-darmstadt.de>
Date: Thu, 6 Nov 2025 17:06:44 +0100
Subject: [PATCH] fixed SyntaxWarning 'is' vs '=='

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

diff --git a/tudplot/utils.py b/tudplot/utils.py
index 751e6e2..11a022f 100644
--- a/tudplot/utils.py
+++ b/tudplot/utils.py
@@ -33,10 +33,10 @@ def facet_plot(dframe, facets, props, ydata, layout=None, newfig=True, figsize=N
     cycl = cycle(plt.rcParams['axes.prop_cycle'])
     prop_styles = {ps: next(cycl) for ps, _ in dframe.groupby(props)}
 
-    if zorder is 'default':
+    if zorder == 'default':
         dz = 1
         zorder = 0
-    elif zorder is 'reverse':
+    elif zorder == 'reverse':
         dz = -1
         zorder = 0
     else: