JetRecCommon.py

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# Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
 
def isMC(flags):
    """A simple filter function for  testing if we're running in MC
    returns (bool, str) where the str contains an explanation of why the bool is False.
    (probably worth re-allocating somehere else)"""
    from AthenaConfiguration.Enums import Format # Test & exclude reading MC BS, no truth info
    return (
        (flags.Input.isMC or flags.Overlay.DataOverlay)
        # Allow for case of no input file, i.e. evgen
        and (flags.Input.FileNentries==-1 or flags.Input.Format!=Format.BS)
    ), "Input file is not MC"