Double-pendulum-model-in-Python.md

+<table>
+  <tr>
+    <th colspan="2">Double pendulum model in Python</th>
+  </tr>
+  <tr>
+    <td style="text-align:center"><img src="Double-pendulum-model-in-Python_screenshot1.png" width=100%></td>
+    <td style="text-align:center"><img src="Double-pendulum-model-in-Python_screenshot2.png" width=100%></td>
+  </tr>
+  <tr>
+    <th colspan="2">Browse <a href="https://gitlab.onelab.info/doc/tutorials/tree/master/PendulumPython/">model files</a></th>
+  </tr>
+</table>
+
+## Quick start
+
+To run the model, open `pend.py` with Gmsh and click on the "Run" button in the
+left panel.
+
+## Features addressed in this tutorial
+
+  * Python ONELAB model
+
+## Additional information
+
+Any Python script can become a native ONELAB client by importing the
+`[onelab.py](https://gitlab.onelab.info/gmsh/gmsh/tree/master/contrib/onelab/python/onelab.py)`
+module. This module comes pre-installed with Gmsh, in the same directory as the
+Gmsh executable. When you open a ONELAB-enabled Python solver with Gmsh, Gmsh
+automatically finds the onelab.py module. You can also install `onelab.py` in
+any directory of your choosing; in this case don't forget to update your
+`PYTHONPATH` environment variable.
+
+----
+*Model developed by @henrotte and @geuzaine.*