core.py 文件源码

def __isub__(self, other):
        """
        Subtract other from self in-place.

        """
        m = getmask(other)
        if self._mask is nomask:
            if m is not nomask and m.any():
                self._mask = make_mask_none(self.shape, self.dtype)
                self._mask += m
        elif m is not nomask:
            self._mask += m
        self._data.__isub__(np.where(self._mask, self.dtype.type(0),
                                     getdata(other)))
        return self