From 0f0815efabfed1083c3aab8f2654d4b9f3440562 Mon Sep 17 00:00:00 2001
From: digitalfrost <gerald.hofmaier@gmail.com>
Date: Mon, 8 Aug 2022 09:33:26 +0200
Subject: [PATCH] Use is not operator rather than not ...is

This is advocated by both PEP8 and the Google Python Style Guide
---
 plugins/X3DReader/X3DReader.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/X3DReader/X3DReader.py b/plugins/X3DReader/X3DReader.py
index bf1966d013..4ef60824f1 100644
--- a/plugins/X3DReader/X3DReader.py
+++ b/plugins/X3DReader/X3DReader.py
@@ -493,7 +493,7 @@ class X3DReader(MeshReader):
             # Columns are the unit vectors for the xz plane for the cross-section
             if orient:
                 mrot = orient[i] if len(orient) > 1 else orient[0]
-                if not mrot is None:
+                if mrot is not None:
                     m = m.dot(mrot)  # Tested against X3DOM, the result matches, still not sure :(
 
             if scale: