def diffSeries(requestContext, *seriesLists):
    if not seriesLists or not any(seriesLists):
        return []
    seriesList, start, end, step = normalize(seriesLists)
    name = "diffSeries(%s)" % formatPathExpressions(seriesList)
    values = (safeDiff(row) for row in zip_longest(*seriesList))
    series = TimeSeries(name, start, end, step, values)
    series.pathExpression = name
    return [series]
tests that if the ratio of Cs to Ds is greater than the golden ratio then strategy defects
dataset/ETHPy150Open brutasse/graphite-api/graphite_api/functions.py/diffSeries--crossover with--dataset/ETHPy150Open Axelrod-Python/Axelrod/axelrod/tests/unit/test_mathematicalconstants.py/TestGolden.test_when_greater_than_golden_ratio