def steffensen(f):
    def F(x):
        fx = f(x)
        ffx = f(fx)
        return (x*ffx - fx**2) / (ffx - 2*fx + x)
    return F
Process a chunk of markdown-formatted text and attach the parse to
dataset/ETHPy150Open fredrik-johansson/mpmath/mpmath/calculus/optimization.py/steffensen--crossover with--dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/markdown/markdown/extensions/legacy.py/MarkdownParser.parseChunk