From 716f7dd8478497558e2e270f15cb5c12f21a17db Mon Sep 17 00:00:00 2001
From: YoongHM <yoonghm@users.noreply.github.com>
Date: Sun, 22 Sep 2019 19:06:30 +0800
Subject: [PATCH] Update _chart_types.py

barnorm is default to None instead of ''
---
 packages/python/plotly/plotly/express/_chart_types.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/python/plotly/plotly/express/_chart_types.py b/packages/python/plotly/plotly/express/_chart_types.py
index 7a08d2e6ac4..5a43dcc8be4 100644
--- a/packages/python/plotly/plotly/express/_chart_types.py
+++ b/packages/python/plotly/plotly/express/_chart_types.py
@@ -779,7 +779,7 @@ def bar_polar(
     labels={},
     color_discrete_sequence=None,
     color_discrete_map={},
-    barnorm="",
+    barnorm=None,
     barmode="relative",
     direction="clockwise",
     start_angle=90,