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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def mfpt(totflux, pi, qminus):
 r"""Mean first passage time for reaction A to B. Parameters totflux : float The total flux between reactant and product pi : (M,) ndarray Stationary distribution qminus : (M,) ndarray Backward comittor Returns ------- tAB : float The mean first-passage time for the A to B reaction See also -------- rate Notes ----- Equal to the inverse rate, see [1]. References .. [1] F. Noe, Ch. Schuette, E. Vanden-Eijnden, L. Reich and T. Weikl: Constructing the Full Ensemble of Folding Pathways from Short Off-Equilibrium Simulations. Proc. Natl. Acad. Sci. USA, 106, 19011-19016 (2009) """

    return dense.tpt.mfpt(totflux, pi, qminus)