def lw(W, Wref=1.0e-12):
    """
    Sound power level :math:`L_{w}` for sound power :math:`W` and reference power :math:`W_{ref}`.
    
    :param W: Sound power :math:`W`.
    :param Wref: Reference power :math:`W_{ref}`. Default value is :math:`10^{12}` watt.
    """
    W = np.asarray(W)
    return 10.0 * np.log10(Wref/W)
dataset/ETHPy150Open python-acoustics/python-acoustics/acoustics/descriptors.py/lw/swapped operands of `/`