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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_tile(self, codepoint: int) -> np.array: """Return a copy of a tile for the given codepoint. If the tile does not exist yet then a blank array will be returned. The tile will have a shape of (height, width, rgba) and a dtype of uint8. Note that most grey-scale tiles will only use the alpha channel and will usually have a solid white color channel. """

        tile = np.zeros(self.tile_shape + (4,), dtype=np.uint8)
        lib.TCOD_tileset_get_tile_(
            self._tileset_p,
            codepoint,
            ffi.cast("struct TCOD_ColorRGBA*", tile.ctypes.data),
        )
        return tile