dash bio test

Author: olayway

doc/python/bio-test.md

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+---
+jupyter:
+  jupytext:
+    notebook_metadata_filter: all
+    text_representation:
+      extension: .md
+      format_name: markdown
+      format_version: '1.2'
+      jupytext_version: 1.3.1
+  kernelspec:
+    display_name: Python 3
+    language: python
+    name: python3
+  language_info:
+    codemirror_mode:
+      name: ipython
+      version: 3
+    file_extension: .py
+    mimetype: text/x-python
+    name: python
+    nbconvert_exporter: python
+    pygments_lexer: ipython3
+    version: 3.6.8
+  plotly:
+    description: Bio test description
+    display_as: bio
+    language: python
+    layout: base
+    name: Bio Test
+    order: 1
+    page_type: u-guide
+    permalink: python/bio-test/
+    thumbnail: thumbnail/hist2dcontour.png
+---
+
+## 2D Histogram Contours or Density Contours
+
+A 2D histogram contour plot, also known as a density contour plot, is a 2-dimensional generalization of a 
+
+```python
+import plotly.express as px
+df = px.data.tips()
+
+fig = px.density_contour(df, x="total_bill", y="tip")
+fig.show()
+```