pyhepmc

Use when reading or writing HepMC3 event records in Python: opening HepMC2, HepMC3, LHEF, or HEPEVT files from a Monte Carlo generator, iterating over events, accessing truth particles and vertices, filtering by status code or PDG ID, traversing decay trees via particle parents/children, using the NumPy API for fast vectorized processing, visualizing events in Jupyter notebooks, or writing modified events back to a HepMC file.