Method nonzero

pandas/core/arrays/sparse/array.py:1434–1438

(self)

            self.__dict__.update(state)

    def nonzero(self) -> tuple[npt.NDArray[np.int32]]:
        if self.fill_value == 0:
            return (self.sp_index.indices,)
        else:
            return (self.sp_index.indices[self.sp_values != 0],)

    # ------------------------------------------------------------------------
    # Reductions