Something

import numpydef iterate_scenario_1(Q23i, QX, V2i, VAL):    if Q23i > 0:        if V2i > VAL/2.:            return QX        else:            return 0    elif Q23i == 0:        if V2i < 2 * VAL:            return 0        else:            return QXdef set_QX(V24i, C24i, k24, QX1, QX2):    if V24i < 1.5 * C24i/k24: return QX1    else: return QX2def model_sewer(**kwargs):    iterations = int(kwargs.get('iterations', 144))    scenario   = int(kwargs.get('scenario', 1))    CM12 = int(kwargs.get('CM12', 25))    CM24 = int(kwargs.get('CM24', 30))    k12  = int(kwargs.get('k12', 70))    k24  = int(kwargs.get('k24', 30))    VAL  = int(kwargs.get('VAL', 1))    QX1  = int(kwargs.get('QX1', 60))    QX2  = int(kwargs.get('QX2', 120))    b12 = 10./k12    b24 =  5./k24        V12 = numpy.zeros((iterations,))    V24 = numpy.zeros((iterations,))    V2  = numpy.zeros((iterations,))    C12 = numpy.zeros((iterations,))    C24 = numpy.zeros((iterations,))    Q12 = numpy.zeros((iterations,))    Q23 = numpy.zeros((iterations,))    Q24 = numpy.zeros((iterations,))    R12 = numpy.ones((iterations,)) * 20.    R12[36:36+72] = 50.    R24 = numpy.ones((iterations,)) * 10.    R24[36:36+72] = 30.    # Q: is this right, for scenario1?    QX = QX1    delta_t = 1    for i in range(iterations - 1):        if V12[i] < C12[i]/k12:            Q12[i] = k12 * V12[i]         else:            Q12[i] = C12[i]                if V24[i] < C24[i]/k24:            Q24[i] = k24 * V24[i]        else:            Q24[i] = C24[i]        if scenario == 2:            QX = set_QX(V24[i], C24[i], k24, QX1, QX2)        Q23[i + 1] = iterate_scenario_1(Q23[i], QX, V2[i], VAL)        V12[i + 1] = V12[i] + (R12[i] - Q12[i]) * delta_t        V24[i + 1] = V24[i] + (R24[i] - Q24[i]) * delta_t        V2[i + 1]  = V2[i] + (Q12[i] + Q24[i] - Q23[i]) * delta_t        if V2[i + 1] < VAL:            C12[i + 1] = CM12            C24[i + 1] = CM24        else:            C12[i + 1] = CM12 - b12 * ( V2[i + 1] - VAL )            C24[i + 1] = CM24 - b24 * ( V2[i + 1] - VAL )if __name__ == "__main__":    #from pprint import pprint    #for k, v in (model_1(scale=False)).items():    #    print k, v    model_sewer()