pylhe

Use when reading or writing Les Houches Event (LHE) files in Python: reading parton-level events from MadGraph, Powheg, Sherpa, Pythia, or Whizard generators, iterating over initial- and final-state parton four-vectors, accessing event weights and scale/PDF reweighting blocks, counting events efficiently, writing modified LHE files back to disk, visualising event topologies with graphviz, or converting events to awkward arrays for vectorized analysis. Also use when the user mentions LHEFile, LHEEvent, LHEParticle, or parsing .lhe / .lhe.gz files.