From 119b23b9864c258410ccb8f013dc4d9b8a72c27a Mon Sep 17 00:00:00 2001
From: John van de Wetering <john@vdwetering.name>
Date: Wed, 8 Apr 2020 10:59:42 +0200
Subject: [PATCH] Fixes #30

---
 pyzx/scripts/cnot_mapper.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pyzx/scripts/cnot_mapper.py b/pyzx/scripts/cnot_mapper.py
index ae31fffc..25777edd 100644
--- a/pyzx/scripts/cnot_mapper.py
+++ b/pyzx/scripts/cnot_mapper.py
@@ -28,7 +28,7 @@
 try:
     import numpy as np
 except:
-    np = pass
+    np = None
     
 if __name__ == '__main__':
     print("Please call this as python -m pyzx mapper ...")