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Setup

Install Dependency Packages

Tip

Since you will need to install some additional Python packages, we recommend setting up a Python Virtual Environment, e.g., with venv.

Install the required packages with:

pip install -r bind/python/requirements.txt

Note

If you get an error stating that "Python.h" cannot be found, you need to install Python development headers and static libraries; depending on your OS and package manager, the relevant package to install is something like python3-dev or python3-devel.

Note

These bindings may not work for Python versions below 3.10

Building the Python Bindings

To enable Python bindings when building iguana, set the build option bind_python to True (rebuild iguana if you changed this option).

For Python to be able to find and use these bindings, you need to set some environment variables:

  • PYTHONPATH must include the path to the python subdirectory of the iguana installation
  • on macOS only, shared libraries must be found in DYLD_LIBRARY_PATH

Tip

You may use this_iguana.sh to set these variables automatically. Assuming you installed Iguana to ./iguana/:

source iguana/bin/this_iguana.sh

Important

If you have ROOT, you likely already have cppyy as part of its installation. Be sure that $PYTHONPATH prioritizes ROOT's installation, so the "correct" cppyy is used

Running the Examples

Example Python scripts are found in this directory as iguana_ex_*.py; they will be installed in the bin/ subdirectory.

Most of them are analogous to the C++ examples, but some may be specific to the Python bindings.