find_unique_file.py

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#  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration

def find_unique_file(pattern):
    "Return a matching file, provided it is unique"
    import glob
    files = glob.glob(pattern)
    
    if not files:
        raise RuntimeError("No '%s' file found" % pattern)
    elif len(files) > 1:
        raise RuntimeError("More than one '%s' file found" % pattern)
    return files[0]