From a27bd498be81d19bf71c8ec9a2b1f65d8dc01837 Mon Sep 17 00:00:00 2001
From: Emmanuelle Gouillart <emma@plot.ly>
Date: Wed, 11 Dec 2019 10:27:20 -0500
Subject: [PATCH 1/2] example with reversed colorscale

---
 doc/python/colorscales.md | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/doc/python/colorscales.md b/doc/python/colorscales.md
index abf7d47197d..ddbff75700b 100644
--- a/doc/python/colorscales.md
+++ b/doc/python/colorscales.md
@@ -5,8 +5,8 @@ jupyter:
     text_representation:
       extension: .md
       format_name: markdown
-      format_version: '1.1'
-      jupytext_version: 1.2.1
+      format_version: '1.2'
+      jupytext_version: 1.3.0
   kernelspec:
     display_name: Python 3
     language: python
@@ -62,6 +62,28 @@ fig = px.scatter(iris, x="sepal_width", y="sepal_length",
 fig.show()
 ```
 
+### Reversing a predefined colorscale
+
+You can reverse a predefined colorscale by appending `_r` to its name, for colorscales given either as a string or a `plotly` object. 
+
+```python
+import plotly.express as px
+iris = px.data.iris()
+fig = px.scatter(iris, x="sepal_width", y="sepal_length",
+                 color="sepal_length", color_continuous_scale='Magma_r')
+
+fig.show()
+```
+
+```python
+import plotly.express as px
+data = [[1, .3, .5, .9], 
+        [.3, .1, .4, 1],
+        [.2, .8, .9, .3]]
+fig = px.imshow(data, color_continuous_scale=px.colors.diverging.Tealrose_r)
+fig.show()
+```
+
 ### Custom Discretized Heatmap Colorscale
 
 ```python

From 6a62381d62f8d872019941c7a7390cf006a975f3 Mon Sep 17 00:00:00 2001
From: Emmanuelle Gouillart <emma@plot.ly>
Date: Wed, 11 Dec 2019 10:58:16 -0500
Subject: [PATCH 2/2] updated changelog

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f3ab635be68..69932340fcb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,6 +34,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
    have a `range_theta` keyword argument for representing only an angular
 section [#1969](https://github.com/plotly/plotly.py/pull/1969).
  - Docstrings of plotly.py are now doctested [#1921](https://github.com/plotly/plotly.py/pull/1921).
+ - Reversing a predefined colorscale by appending `_r` to its name [#1933](https://github.com/plotly/plotly.py/pull/1933)
 
 ## [4.3.0] - 2019-11-11