
    The *out* argument to `numpy.power` is not supported, `third` has to be
    None.

    Examples
    --------
    >>> import numpy.ma as ma
    >>> x = [11.2, -3.973, 0.801, -1.41]
    >>> mask = [0, 0, 0, 1]
    >>> masked_x = ma.masked_array(x, mask)
    >>> masked_x
    masked_array(data=[11.2, -3.973, 0.801, --],
             mask=[False, False, False,  True],
       fill_value=1e+20)
    >>> ma.power(masked_x, 2)
    masked_array(data=[125.43999999999998, 15.784728999999999,
                   0.6416010000000001, --],
             mask=[False, False, False,  True],
       fill_value=1e+20)
    >>> y = [-0.5, 2, 0, 17]
    >>> masked_y = ma.masked_array(y, mask)
    >>> masked_y
    masked_array(data=[-0.5, 2.0, 0.0, --],
             mask=[False, False, False,  True],
       fill_value=1e+20)
    >>> ma.power(masked_x, masked_y)
    masked_array(data=[0.29880715233359845, 15.784728999999999, 1.0, --],
             mask=[False, False, False,  True],
       fill_value=1e+20)

    Nz