diff --git a/.circleci/config.yml b/.circleci/config.yml
index 9fa39507cf..b51a92adea 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -9,10 +9,10 @@ jobs:
       - checkout
       - run:
           name: Install black
-          command: 'sudo pip install black'
+          command: "sudo pip install black"
       - run:
           name: Check formatting with black
-          command: 'black --check .'
+          command: "black --check ."
 
   # Core
   python-2.7-core:
@@ -25,10 +25,10 @@ jobs:
       - checkout
       - run:
           name: Install tox
-          command: 'sudo pip install tox'
+          command: "sudo pip install tox"
       - run:
           name: Test with tox
-          command: 'cd packages/python/plotly; tox -e py27-core'
+          command: "cd packages/python/plotly; tox -e py27-core"
           no_output_timeout: 20m
 
   python-3.5-core:
@@ -41,10 +41,10 @@ jobs:
       - checkout
       - run:
           name: Install tox
-          command: 'sudo pip install tox'
+          command: "sudo pip install tox"
       - run:
           name: Test with tox
-          command: 'cd packages/python/plotly; tox -e py35-core'
+          command: "cd packages/python/plotly; tox -e py35-core"
           no_output_timeout: 20m
 
   python-3.6-core:
@@ -57,10 +57,10 @@ jobs:
       - checkout
       - run:
           name: Install tox
-          command: 'sudo pip install tox'
+          command: "sudo pip install tox"
       - run:
           name: Test with tox
-          command: 'cd packages/python/plotly; tox -e py36-core'
+          command: "cd packages/python/plotly; tox -e py36-core"
           no_output_timeout: 20m
 
   python-3.7-core:
@@ -73,10 +73,10 @@ jobs:
       - checkout
       - run:
           name: Install tox
-          command: 'sudo pip install tox'
+          command: "sudo pip install tox"
       - run:
           name: Test with tox
-          command: 'cd packages/python/plotly; tox -e py37-core'
+          command: "cd packages/python/plotly; tox -e py37-core"
           no_output_timeout: 20m
 
   python-3.7-percy:
@@ -122,14 +122,14 @@ jobs:
       - checkout
       - run:
           name: Install tox
-          command: 'sudo pip install tox'
+          command: "sudo pip install tox"
       - run:
           name: Install npm dependencies
           command: cd packages/python/plotly/plotly/tests/test_optional/test_jupyter && npm install
           no_output_timeout: 20m
       - run:
           name: Test with tox
-          command: 'cd packages/python/plotly; tox -e py27-optional'
+          command: "cd packages/python/plotly; tox -e py27-optional"
           no_output_timeout: 20m
 
   python-3.5-optional:
@@ -142,14 +142,14 @@ jobs:
       - checkout
       - run:
           name: Install tox
-          command: 'sudo pip install tox'
+          command: "sudo pip install tox"
       - run:
           name: Install npm dependencies
           command: cd packages/python/plotly/plotly/tests/test_optional/test_jupyter && npm install
           no_output_timeout: 20m
       - run:
           name: Test with tox
-          command: 'cd packages/python/plotly; tox -e py35-optional'
+          command: "cd packages/python/plotly; tox -e py35-optional"
           no_output_timeout: 20m
 
   python-3.6-optional:
@@ -162,14 +162,14 @@ jobs:
       - checkout
       - run:
           name: Install tox
-          command: 'sudo pip install tox'
+          command: "sudo pip install tox"
       - run:
           name: Install npm dependencies
           command: cd packages/python/plotly/plotly/tests/test_optional/test_jupyter && npm install
           no_output_timeout: 20m
       - run:
           name: Test with tox
-          command: 'cd packages/python/plotly; tox -e py36-optional'
+          command: "cd packages/python/plotly; tox -e py36-optional"
           no_output_timeout: 20m
 
   python-3.7-optional:
@@ -182,14 +182,14 @@ jobs:
       - checkout
       - run:
           name: Install tox
-          command: 'sudo pip install tox'
+          command: "sudo pip install tox"
       - run:
           name: Install npm dependencies
           command: cd packages/python/plotly/plotly/tests/test_optional/test_jupyter && npm install
           no_output_timeout: 20m
       - run:
           name: Test with tox
-          command: 'cd packages/python/plotly; tox -e py37-optional'
+          command: "cd packages/python/plotly; tox -e py37-optional"
           no_output_timeout: 20m
 
   # Plot.ly
@@ -203,10 +203,10 @@ jobs:
       - checkout
       - run:
           name: Install tox
-          command: 'sudo pip install tox'
+          command: "sudo pip install tox"
       - run:
           name: Test with tox
-          command: 'cd packages/python/chart-studio; tox -e py27-plot_ly'
+          command: "cd packages/python/chart-studio; tox -e py27-plot_ly"
           no_output_timeout: 20m
 
   python-3.5-plot_ly:
@@ -219,10 +219,10 @@ jobs:
       - checkout
       - run:
           name: Install tox
-          command: 'sudo pip install tox'
+          command: "sudo pip install tox"
       - run:
           name: Test with tox
-          command: 'cd packages/python/chart-studio; tox -e py35-plot_ly'
+          command: "cd packages/python/chart-studio; tox -e py35-plot_ly"
           no_output_timeout: 20m
 
   python-3.7-plot_ly:
@@ -235,10 +235,10 @@ jobs:
       - checkout
       - run:
           name: Install tox
-          command: 'sudo pip install tox'
+          command: "sudo pip install tox"
       - run:
           name: Test with tox
-          command: 'cd packages/python/chart-studio; tox -e py37-plot_ly'
+          command: "cd packages/python/chart-studio; tox -e py37-plot_ly"
           no_output_timeout: 20m
 
   python-2-7-orca:
@@ -269,7 +269,7 @@ jobs:
             pytest packages/python/plotly/plotly/tests/test_orca
 
       - store_artifacts:
-            path: plotly/tests/test_orca/images/linux/failed
+          path: plotly/tests/test_orca/images/linux/failed
 
   python-3-5-orca:
     docker:
@@ -299,7 +299,7 @@ jobs:
             pytest packages/python/plotly/plotly/tests/test_orca
 
       - store_artifacts:
-            path: plotly/tests/test_orca/images/linux/failed
+          path: plotly/tests/test_orca/images/linux/failed
 
   python-3-7-orca:
     docker:
@@ -325,12 +325,12 @@ jobs:
           command: |
             . /home/circleci/miniconda/etc/profile.d/conda.sh
             conda activate circle_optional
-            pytest --doctest-modules --ignore packages/python/plotly/plotly/tests --ignore packages/python/plotly/plotly/matplotlylib/mplexporter/tests packages/python/plotly/plotly 
+            pytest --doctest-modules --ignore packages/python/plotly/plotly/tests --ignore packages/python/plotly/plotly/matplotlylib/mplexporter/tests packages/python/plotly/plotly
             pytest --disable-warnings packages/python/plotly/plotly/tests/test_core
             pytest packages/python/plotly/plotly/tests/test_orca
 
       - store_artifacts:
-            path: plotly/tests/test_orca/images/linux/failed
+          path: plotly/tests/test_orca/images/linux/failed
 
   plotlyjs_dev_build:
     docker:
@@ -343,13 +343,13 @@ jobs:
       - checkout
       - run:
           name: Install tox
-          command: 'sudo pip install retrying tox black inflect'
+          command: "sudo pip install retrying tox black inflect"
       - run:
           name: Update jupyterlab-plotly version
-          command: 'cd packages/python/plotly; python setup.py updateplotlywidgetversion'
+          command: "cd packages/python/plotly; python setup.py updateplotlywidgetversion"
       - run:
           name: Update plotly.js to dev
-          command: 'cd packages/python/plotly; python setup.py updateplotlyjsdev'
+          command: "cd packages/python/plotly; python setup.py updateplotlyjsdev"
       - run:
           name: Test with tox
           command: |
@@ -385,7 +385,6 @@ jobs:
       - store_artifacts:
           path: packages/python/plotly/dist
 
-
   build-doc:
     resource_class: xlarge
     docker:
@@ -393,7 +392,6 @@ jobs:
       # use `-browsers` prefix for selenium tests, e.g. `3.6.1-browsers`
       - image: circleci/python:3.6.8-node
 
-
         working_directory: ~/project
 
     steps:
@@ -419,12 +417,12 @@ jobs:
             npm install electron@1.8.4
             npm install orca
             pip install -r requirements.txt
-            if [ "${CIRCLE_BRANCH}" == "master" ]; then
+            if [ "${CIRCLE_BRANCH}" != "doc-prod" ]; then
               pip uninstall -y plotly
               cd ../packages/python/plotly
               python3 setup.py install
-              cd ../../../doc      
-            fi 
+              cd ../../../doc
+            fi
             echo 'export PATH="/home/circleci/project/doc/node_modules/.bin:$PATH"' >> $BASH_ENV
             sudo apt-get install -y poppler-utils libxtst6 xvfb libgtk2.0-0 libgconf-2-4 libnss3 libasound2
             cd ..
@@ -484,12 +482,9 @@ jobs:
 
             cd ../..
 
-
       - store_artifacts:
           path: doc/build
           destination: doc/build
-     
-
 
 workflows:
   version: 2
diff --git a/.gitignore b/.gitignore
index ddcf80c21f..7b9716095e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -43,3 +43,4 @@ plotly/tests/test_orca/images/*/tmp
 /plotly-package/plotly/tests/test_core/test_offline/plotly.min.js
 temp-plot.html
 .vscode
+doc/python/.ipynb_checkpoints
diff --git a/doc/python/polar-chart.md b/doc/python/polar-chart.md
index 248c8b2bf3..08019307d8 100644
--- a/doc/python/polar-chart.md
+++ b/doc/python/polar-chart.md
@@ -20,7 +20,7 @@ jupyter:
     name: python
     nbconvert_exporter: python
     pygments_lexer: ipython3
-    version: 3.6.7
+    version: 3.6.8
   plotly:
     description: How to make polar charts in Python with Plotly.
     display_as: scientific
@@ -75,6 +75,15 @@ fig.show()
 See also the [wind rose page](https://plot.ly/python/wind-rose-charts/) for more wind rose visualizations in polar coordinates.
 
 
+You can plot less than a whole circle with the `range_theta` argument, and also control the `start_angle` and `direction`:
+
+```python
+import plotly.express as px
+fig = px.scatter_polar(r=range(0,90,10), theta=range(0,90,10), 
+                       range_theta=[0,90], start_angle=0, direction="counterclockwise")
+fig.show()
+```
+
 ## Polar Scatter Plot with go.Scatterpolar
 
 If Plotly Express does not provide a good starting point, you can use the more generic `go.Scatterpolar`. All the options are documented in the [reference page](https://plot.ly/python/reference/#scatterpolar).
diff --git a/packages/python/plotly/plotly/express/_chart_types.py b/packages/python/plotly/plotly/express/_chart_types.py
index e41c684967..9be0a02c03 100644
--- a/packages/python/plotly/plotly/express/_chart_types.py
+++ b/packages/python/plotly/plotly/express/_chart_types.py
@@ -734,6 +734,7 @@ def scatter_polar(
     start_angle=90,
     size_max=None,
     range_r=None,
+    range_theta=None,
     log_r=False,
     render_mode="auto",
     title=None,
@@ -776,6 +777,7 @@ def line_polar(
     line_shape=None,
     render_mode="auto",
     range_r=None,
+    range_theta=None,
     log_r=False,
     title=None,
     template=None,
@@ -811,6 +813,7 @@ def bar_polar(
     direction="clockwise",
     start_angle=90,
     range_r=None,
+    range_theta=None,
     log_r=False,
     title=None,
     template=None,
diff --git a/packages/python/plotly/plotly/express/_core.py b/packages/python/plotly/plotly/express/_core.py
index 849b874f00..21b52a5cb7 100644
--- a/packages/python/plotly/plotly/express/_core.py
+++ b/packages/python/plotly/plotly/express/_core.py
@@ -534,6 +534,9 @@ def configure_polar_axes(args, fig, orders):
     else:
         if args["range_r"]:
             radialaxis["range"] = args["range_r"]
+
+    if args["range_theta"]:
+        layout["polar"]["sector"] = args["range_theta"]
     fig.update(layout=layout)
 
 
diff --git a/packages/python/plotly/plotly/express/_doc.py b/packages/python/plotly/plotly/express/_doc.py
index d30c1217d4..3ee3df4e5a 100644
--- a/packages/python/plotly/plotly/express/_doc.py
+++ b/packages/python/plotly/plotly/express/_doc.py
@@ -303,6 +303,10 @@
         "list of two numbers",
         "If provided, overrides auto-scaling on the radial axis in polar coordinates.",
     ],
+    range_theta=[
+        "list of two numbers",
+        "If provided, overrides auto-scaling on the angular axis in polar coordinates.",
+    ],
     title=["str", "The figure title."],
     template=[
         "or dict or plotly.graph_objects.layout.Template instance",