diff --git a/src/_pytest/python_api.py b/src/_pytest/python_api.py
index bd74ec296..9ce9c62e0 100644
--- a/src/_pytest/python_api.py
+++ b/src/_pytest/python_api.py
@@ -450,26 +450,25 @@ class ApproxScalar(ApproxBase):
         # for compatibility with complex numbers.
         if math.isinf(abs(self.expected)):  # type: ignore[arg-type]
             return False
-    
-        tolerance = self.tolerance    
+
+        tolerance = self.tolerance
         expected = self.expected
-        
-        if (isinstance(self.expected, Decimal) and not isinstance(actual, Decimal)):
+
+        if isinstance(self.expected, Decimal) and not isinstance(actual, Decimal):
             try:
                 actual = Decimal(str(actual))
                 tolerance = Decimal(str(tolerance))
-            except TypeError: # 
+            except TypeError:  #
                 return False
-        elif (isinstance(actual, Decimal) and not isinstance(self.expected, Decimal)):
-            try :
+        elif isinstance(actual, Decimal) and not isinstance(self.expected, Decimal):
+            try:
                 expected = Decimal(str(expected))
                 tolerance = Decimal(str(tolerance))
             except TypeError:
                 return False
-            
 
         # Return true if the two numbers are within the tolerance.
-        result: bool = (abs(actual - expected) <= tolerance ) # type: ignore[arg-type]
+        result: bool = abs(actual - expected) <= tolerance  # type: ignore[arg-type]
         return result
 
     # Ignore type because of https://github.com/python/mypy/issues/4266.
@@ -508,11 +507,11 @@ class ApproxScalar(ApproxBase):
         # we've made sure the user didn't ask for an absolute tolerance only,
         # because we don't want to raise errors about the relative tolerance if
         # we aren't even going to use it.
-        
+
         if isinstance(self.rel, Decimal):
             relative_tolerance = set_default(
                 self.rel, self.DEFAULT_RELATIVE_TOLERANCE
-            )*Decimal(str(abs(self.expected)))
+            ) * Decimal(str(abs(self.expected)))
         else:
             relative_tolerance = set_default(
                 self.rel, self.DEFAULT_RELATIVE_TOLERANCE
diff --git a/testing/python/approx.py b/testing/python/approx.py
index eadaba1da..6bfd5a9bf 100644
--- a/testing/python/approx.py
+++ b/testing/python/approx.py
@@ -568,14 +568,14 @@ class TestApprox:
         expected = [Decimal("1"), Decimal("2")]
 
         assert actual == approx(expected)
-        
+
         expected = [1, 2]
-        
+
         assert actual == approx(expected)
-        
+
         expected = [Decimal("1"), Decimal("2")]
         actual = [1.000001, 2.000001]
-        
+
         assert actual == approx(expected)
 
     def test_list_wrong_len(self):
@@ -618,14 +618,14 @@ class TestApprox:
         expected = {"b": Decimal("2"), "a": Decimal("1")}
 
         assert actual == approx(expected)
-        
+
         actual = {"a": 1.000001, "b": 2.000001}
-        
+
         assert actual == approx(expected)
-        
+
         actual = {"a": Decimal("1.000001"), "b": Decimal("2.000001")}
         expected = {"b": 2, "a": 1}
-        
+
         assert actual == approx(expected)
 
     def test_dict_wrong_len(self):
@@ -902,4 +902,3 @@ class TestApprox:
         """pytest.approx() should raise an error on unordered sequences (#9692)."""
         with pytest.raises(TypeError, match="only supports ordered sequences"):
             assert {1, 2, 3} == approx({1, 2, 3})
-    
\ No newline at end of file