diff --git a/src/openqlab/analysis/cavity.py b/src/openqlab/analysis/cavity.py
index 02e7c069e33e25be4dd110c9db16af68aee06edb..8b57c25ae45659b1e7f01397c18e61e3d33a2e9f 100644
--- a/src/openqlab/analysis/cavity.py
+++ b/src/openqlab/analysis/cavity.py
@@ -227,7 +227,7 @@ def linewidth(
 
         plt.figure()
         plt.plot(
-            plot_frequency, data["Error_filtered"], marker="x", label="Error function",
+            plot_frequency, data["Error_filtered"], marker="x", label="Error function"
         )
         plt.plot(plot_frequency, data["Error_gradient"], ls="-", label="Gradient")
         plt.plot(
@@ -242,7 +242,7 @@ def linewidth(
 
         plt.figure()  # pylint: disable=unused-variable
         plt.plot(
-            plot_frequency_window, data_offset, linestyle=" ", marker=".", label="data",
+            plot_frequency_window, data_offset, linestyle=" ", marker=".", label="data"
         )
         plt.plot(plot_frequency_window, fit, label="fit")
 
diff --git a/src/openqlab/io/importers/keysight_visa.py b/src/openqlab/io/importers/keysight_visa.py
index 952c4026d828546e0a1e37e41b85ca2763b93d3a..e766e795358db19e79954205ad200ba428b9a91a 100644
--- a/src/openqlab/io/importers/keysight_visa.py
+++ b/src/openqlab/io/importers/keysight_visa.py
@@ -57,12 +57,7 @@ class KeysightVisa(VisaImporter):
         preamble = self.query("WAV:PREamble?").strip()
         entries = preamble.split(",")
 
-        type_dict = {
-            0: "normal",
-            1: "peak detect",
-            2: "average",
-            3: "hresolution",
-        }
+        type_dict = {0: "normal", 1: "peak detect", 2: "average", 3: "hresolution"}
 
         self._header = dict(
             # format=entries[0],
diff --git a/src/tests/test_io/test_importers/test_gwinstek/test_gwinstek.py b/src/tests/test_io/test_importers/test_gwinstek/test_gwinstek.py
index 617641d8f31564be87a489931842eb7dbb38f6b9..b82ed6f7cb97ca1f5aa0d52554879a76e830df32 100644
--- a/src/tests/test_io/test_importers/test_gwinstek/test_gwinstek.py
+++ b/src/tests/test_io/test_importers/test_gwinstek/test_gwinstek.py
@@ -54,10 +54,7 @@ class TestGwinstek(unittest.TestCase):
                 raise AssertionError(f"{file} did not raise {UnknownFileType}") from e
 
     def test_missing_data(self):
-        files = [
-            filedir / "missing_data.csv",
-            filedir / "missing_data_1.csv",
-        ]
+        files = [filedir / "missing_data.csv", filedir / "missing_data_1.csv"]
         for file in files:
             try:
                 with self.assertRaises(EmptyDataError):