From 5a48b6879540747b760d1732c8080c2777132710 Mon Sep 17 00:00:00 2001
From: Daniel Lidstrom <lidstrom83@protonmail.com>
Date: Thu, 17 Dec 2020 18:17:06 -0800
Subject: [PATCH] Bugfix

---
 pyqtgraph/widgets/TreeWidget.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pyqtgraph/widgets/TreeWidget.py b/pyqtgraph/widgets/TreeWidget.py
index 8c55ae2f..4540915f 100644
--- a/pyqtgraph/widgets/TreeWidget.py
+++ b/pyqtgraph/widgets/TreeWidget.py
@@ -132,7 +132,7 @@ class TreeWidget(QtGui.QTreeWidget):
     
     def listAllItems(self, item=None):
         items = []
-        if item != None:
+        if item is not None:
             items.append(item)
         else:
             item = self.invisibleRootItem()