def readkwargs(**kwargs):
    flag=0
    for key in kwargs.keys():
        if key=='SAFEDISTANCE':
            SAFEDISTANCE=kwargs[key]
            flag=1
        if key=='MAX_BACK_TIMES':
            MAX_BACK_TIMES=kwargs[key]
        if key=='im_step':
            im_step=kwargs[key]
        if key=='im_self2other':
            im_self2other=kwargs[key]
        if key=='MAX_ITER':
            MAX_ITER_STEP,MAX_ITER_SELECT,MAX_ITER_SIMULA=kwargs[key]
    if flag!=1:
        SAFEDISTANCE=0
    return (SAFEDISTANCE,MAX_BACK_TIMES,im_step,im_self2other,MAX_ITER_STEP,MAX_ITER_SELECT,MAX_ITER_SIMULA)