udst_compatibility-v04-02-04.py

#!/usr/bin/env python3
 
 
 
"""
Test backwards compatibility for a udst file produced with release-04-01-04.
 
This is not always guaranteed. Analysis objects may break backwards
compatibility for older files. Some niche corner cases might be problematic for
file produced with release older than release-05-00-00.
 
See https://confluence.desy.de/display/BI/Backward+Compatibility for more
"""
 
import basf2
import b2test_utils
import udst
 
if __name__ == "__main__":
 
    # clear out stray env variables and set seeding for reproducible results
    b2test_utils.configure_logging_for_tests()
    basf2.set_random_seed(1)
 
    # configure processing path - input file is the first 3 events from Phil's
    # favourite test udst file from https://questions.belle2.org/question/9758/
    main = basf2.create_path()
    main.add_module(
        "RootInput", inputFileName=basf2.find_file("analysis/tests/udst-v04-02-04.root")
    )
    main.add_module("EventInfoPrinter")
 
    # this function does the hard work
    udst.add_udst_dump(main, True)
 
    # also dump some variables just in case the DataStorePrinter hides some
    # problems (like has happened once: GitLab issue #7023).
    sanity_check_variables = [
        "mcPDG",
        "daughter(0, mcPDG)",  # check the MCParticle <--> Particle relation (or array index lookup)
        "Mbc", "InvM", "deltaE",
        "daughter(1, pionID)",  # check the PIDLikelihoods <--> Particle relation
        "daughter(1, kaonID)",
        "daughter(1, clusterE)",  # check the ECLCluster <--> Particle relation (or array index lookup)
        "daughter(1, klmClusterLayers)",  # check the KLMCluster <--> Particle relation (or array index lookup)
    ]
    main.add_module(
        "ParticlePrinter", listName="B0:semileptonic", variables=sanity_check_variables)
 
    # only 3 events in the file, but set explicitly case this test script gets copied
    basf2.process(main, 3)