diff --git a/pandas/io/formats/excel.py b/pandas/io/formats/excel.py
index 4279a9707e692..f9b3145eab170 100644
--- a/pandas/io/formats/excel.py
+++ b/pandas/io/formats/excel.py
@@ -96,7 +96,7 @@ def __init__(
             unique_declarations = frozenset(declaration_dict.items())
             style = css_converter(unique_declarations)
 
-        return super().__init__(row=row, col=col, val=val, style=style, **kwargs)
+        super().__init__(row=row, col=col, val=val, style=style, **kwargs)
 
 
 class CSSToExcelConverter:
diff --git a/pandas/tests/apply/test_series_apply.py b/pandas/tests/apply/test_series_apply.py
index 8900aa0060559..afe1c236858ab 100644
--- a/pandas/tests/apply/test_series_apply.py
+++ b/pandas/tests/apply/test_series_apply.py
@@ -668,7 +668,7 @@ def test_map_abc_mapping_with_missing(non_dict_mapping_subclass):
     # https://github.com/pandas-dev/pandas/issues/29733
     # Check collections.abc.Mapping support as mapper for Series.map
     class NonDictMappingWithMissing(non_dict_mapping_subclass):
-        def __missing__(key):
+        def __missing__(self, key):
             return "missing"
 
     s = Series([1, 2, 3])
diff --git a/pandas/tests/dtypes/test_inference.py b/pandas/tests/dtypes/test_inference.py
index 8fe6abd3b0ed5..14f37bca71f82 100644
--- a/pandas/tests/dtypes/test_inference.py
+++ b/pandas/tests/dtypes/test_inference.py
@@ -236,7 +236,7 @@ def test_is_sequence():
     assert not is_seq(np.int64)
 
     class A:
-        def __getitem__(self):
+        def __getitem__(self, item):
             return 1
 
     assert not is_seq(A())
diff --git a/pandas/tests/frame/test_constructors.py b/pandas/tests/frame/test_constructors.py
index d00cf198b3296..fb5da7e81adbd 100644
--- a/pandas/tests/frame/test_constructors.py
+++ b/pandas/tests/frame/test_constructors.py
@@ -1390,7 +1390,7 @@ def __init__(self, lst) -> None:
             def __getitem__(self, n):
                 return self._lst.__getitem__(n)
 
-            def __len__(self, n):
+            def __len__(self):
                 return self._lst.__len__()
 
         lst_containers = [DummyContainer([1, "a"]), DummyContainer([2, "b"])]