def pathOf(dir, base, ext, delim='.'):
    p = os.path
    return p.normpath(p.join(dir,"%s%s%s" % (base, delim, ext)))
Implement this method in a subclass such that it returns a serializable
dataset/ETHPy150Open xraypy/xraylarch/plugins/io/fileutils.py/pathOf--crossover with--dataset/ETHPy150Open deanhiller/databus/webapp/play1.3.x/python/Lib/json/encoder.py/JSONEncoder.default