diff --git a/py7zr/compressor.py b/py7zr/compressor.py
index e051feec..59a95578 100644
--- a/py7zr/compressor.py
+++ b/py7zr/compressor.py
@@ -45,7 +45,7 @@
 except ImportError:
     import py7zr.bcjfilter as BCJFilter  # type: ignore  # noqa
 try:
-    import pyzstd
+    import pyzstd  # noqa
 
     import py7zr.pyzstdfilter as Zstd  # type: ignore  # noqa
 except ImportError:
@@ -254,7 +254,6 @@ def decompress(self, data: Union[bytes, bytearray, memoryview], max_length: int
         return bytes(data)
 
 
-
 class PpmdDecompressor(ISevenZipDecompressor):
 
     def __init__(self, properties: bytes):
diff --git a/tests/test_extra_codecs.py b/tests/test_extra_codecs.py
index 3d2f3732..bd74bba4 100644
--- a/tests/test_extra_codecs.py
+++ b/tests/test_extra_codecs.py
@@ -119,6 +119,7 @@ def test_pyzstd_compressor_1():
                  b"\xe4\x97BB\xd2\x01\x00\x18\xb8z\x02"
     assert outdata == compressed
 
+
 @pytest.mark.unit
 @pytest.mark.skipif(zstandard is None, reason="zstd library is not exist.")
 def test_zstd_decompressor_1():