python.md

title: Python bindings

DuMu^x^ Python bindings

Using DuMu^x^ from Python

• Based on just-in-time (JIT) compilation of Python binding code
• Experimental feature: only a small subset of functionality is available
• See Python test apps

Configuration

• Enabled and built by default!
• dune-common configures a Python virtual environment (dune-common/build-cmake/dune-env)
• Automatically created and set up when running dunecontrol
• On Ubuntu systems you need to install python3-venv (e.g. sudo apt install python3-venv) for venv to work properly.
• To activate:

  source dune-common/build-cmake/dune-env/bin/activate

Configuration

For more control, follow

./dune-common/bin/dunecontrol bexec rm -r CMakeFiles CMakeCache.txt
python3 -m venv venv
source venv/bin/activate
./dune-common/bin/dunecontrol --opts=dumux/cmake.opts configure
./dune-common/bin/dunecontrol --opts=dumux/cmake.opts make -j

which installs Python bindings into the activated virtual environment.

Example Python code

• See dumux/test/python/test_1p.py
• With virtual environment activated, run

python3 test_1p.py

• First time takes very long, due to a lot of JIT
• Second run is much faster

Small exercise

• Increase the number of grid cells to
  $100 \times 100$
• Add a constant source term of
  $10.0$
• Note that you don't have to recompile
• Visualization: pip install pyvista and append

import pyvista as pv
mesh = pv.read("test_1p_box_numeric-00000.vtu")
mesh.plot(show_edges=True, full_screen=True)

Further resources

• DuMu^x^ documentation