How to use the zstandard.CompressionParameters function in zstandard

def test_magic_less(self):
        params = zstd.CompressionParameters.from_level(
            1, format=zstd.FORMAT_ZSTD1_MAGICLESS
        )
        cctx = zstd.ZstdCompressor(compression_params=params)
        frame = cctx.compress(b"foobar")

        self.assertNotEqual(frame[0:4], b"\x28\xb5\x2f\xfd")

        dctx = zstd.ZstdDecompressor()
        with self.assertRaisesRegex(
            zstd.ZstdError, "error determining content size from frame header"
        ):
            dctx.decompress(frame)

        dctx = zstd.ZstdDecompressor(format=zstd.FORMAT_ZSTD1_MAGICLESS)
        res = b"".join(dctx.read_to_iter(frame))
        self.assertEqual(res, b"foobar")

def test_from_level(self):
        p = zstd.ZstdCompressionParameters.from_level(1)
        self.assertIsInstance(p, zstd.CompressionParameters)

        self.assertEqual(p.window_log, 19)

        p = zstd.ZstdCompressionParameters.from_level(-4)
        self.assertEqual(p.window_log, 19)

def test_bad_precompute_compress(self):
        d = zstd.train_dictionary(8192, generate_samples(), k=64, d=16)

        with self.assertRaisesRegex(ValueError, "must specify one of level or "):
            d.precompute_compress()

        with self.assertRaisesRegex(ValueError, "must only specify one of level or "):
            d.precompute_compress(
                level=3, compression_params=zstd.CompressionParameters()
            )