diff --git a/compile.py b/compile.py
index c3c2217..88b1f14 100755
--- a/compile.py
+++ b/compile.py
@@ -28,7 +28,7 @@ def get_arch() -> str:
                 arch = k
                 break
 
-    if arch == None:
+    if arch is None:
         arch = platform.machine().lower()
 
     return arch
@@ -64,9 +64,9 @@ def copy_if_universal(wheel_name: Path, in_dir: Path, out_dir: Path) -> bool:
         src_path = Path(in_dir, wheel_name.name)
         dst_path = Path(
             out_dir,
-            wheel_name.name
-            .replace("x86_64", "universal2")
-            .replace("arm64", "universal2"),
+            wheel_name.name.replace("x86_64", "universal2").replace(
+                "arm64", "universal2"
+            ),
         )
 
         shutil.copy(src_path, dst_path)
diff --git a/scripts/opt-comp-experiment.py b/scripts/opt-comp-experiment.py
index e5441b4..29c69ee 100755
--- a/scripts/opt-comp-experiment.py
+++ b/scripts/opt-comp-experiment.py
@@ -25,9 +25,9 @@
 os.chdir(Path(__file__).resolve().parent)
 sys.path.append("../src")
 
-from sticker_convert.converter import StickerConvert
-from sticker_convert.job_option import CompOption
-from sticker_convert.utils.callback import Callback, CallbackReturn
+from sticker_convert.converter import StickerConvert  # noqa: E402
+from sticker_convert.job_option import CompOption  # noqa: E402
+from sticker_convert.utils.callback import Callback, CallbackReturn  # noqa: E402
 
 processes_max = math.ceil(cpu_count() / 2)
 
diff --git a/src/sticker_convert/converter.py b/src/sticker_convert/converter.py
index e7e5142..2cb3654 100755
--- a/src/sticker_convert/converter.py
+++ b/src/sticker_convert/converter.py
@@ -158,7 +158,7 @@ def convert(
             Callback,
         ],
         cb_return: CallbackReturn,
-    ) -> tuple[bool, Union[BytesIO, Path], Union[None, bytes, Path], int]:
+    ) -> tuple[bool, Union[None, BytesIO, Path], Union[None, bytes, Path], int]:
         sticker = StickerConvert(in_f, out_f, opt_comp, cb)
         result = sticker._convert()
         cb.put("update_bar")
@@ -342,7 +342,7 @@ def compress_fail(
 
     def compress_done(
         self, data: bytes, result_step: Optional[int] = None
-    ) -> tuple[bool, Union[BytesIO, Path], Union[None, bytes, Path], int]:
+    ) -> tuple[bool, Union[None, BytesIO, Path], Union[None, bytes, Path], int]:
         if self.out_f.stem == "none":
             out_f = None
         elif self.out_f.stem == "bytes":
diff --git a/tests/common.py b/tests/common.py
index 049a092..b347995 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -6,8 +6,6 @@
 from pathlib import Path
 from typing import Any
 
-import pytest  # type: ignore
-
 
 def get_python_path() -> str:
     path = shutil.which("python3")
diff --git a/tests/test_compression.py b/tests/test_compression.py
index b0cd638..24646e7 100644
--- a/tests/test_compression.py
+++ b/tests/test_compression.py
@@ -2,14 +2,13 @@
 import sys
 from pathlib import Path
 
-import pytest  # type: ignore
 
 from tests.common import COMPRESSION_DICT, PYTHON_EXE, SAMPLE_DIR, SRC_DIR, run_cmd
 
 os.chdir(Path(__file__).resolve().parent)
 sys.path.append("../src")
 
-from sticker_convert.utils.media.codec_info import CodecInfo
+from sticker_convert.utils.media.codec_info import CodecInfo  # noqa: E402
 
 SIZE_MAX_IMG = COMPRESSION_DICT.get("custom").get("size_max").get("img")
 SIZE_MAX_VID = COMPRESSION_DICT.get("custom").get("size_max").get("vid")
diff --git a/tests/test_export.py b/tests/test_export.py
index 864ad45..08b2b1a 100644
--- a/tests/test_export.py
+++ b/tests/test_export.py
@@ -20,7 +20,7 @@
 os.chdir(Path(__file__).resolve().parent)
 sys.path.append("../src")
 
-from sticker_convert.utils.media.codec_info import CodecInfo
+from sticker_convert.utils.media.codec_info import CodecInfo  # noqa: E402
 
 TEST_UPLOAD = os.environ.get("TEST_UPLOAD")
 
@@ -163,7 +163,7 @@ def test_upload_telegram_emoji(tmp_path):  # type: ignore
 def test_export_wastickers(tmp_path):  # type: ignore
     _run_sticker_convert(tmp_path, "whatsapp", "whatsapp")  # type: ignore
 
-    wastickers_path = Path(tmp_path, f"sticker-convert-test.wastickers")  # type: ignore
+    wastickers_path = Path(tmp_path, "sticker-convert-test.wastickers")  # type: ignore
     assert Path(wastickers_path).is_file()