Python - SUMAS RIEMANN --- MEDICION ALTURA DEL RECTANGULO

def riemanSum(start, stop, step):

    result = 0.0

    increment = (stop - start)/step

    increment_tmp = increment/2

    x =start

    i=0.0

    while i < step:

        result += increment * f(x+increment_tmp)

        x += increment

        i+=1

    return result