diff --git a/pandas/_testing/asserters.py b/pandas/_testing/asserters.py
index d0a95e764472d..a5641465b0be0 100644
--- a/pandas/_testing/asserters.py
+++ b/pandas/_testing/asserters.py
@@ -571,20 +571,12 @@ def raise_assert_detail(
 
     if isinstance(left, np.ndarray):
         left = pprint_thing(left)
-    elif (
-        isinstance(left, CategoricalDtype)
-        or isinstance(left, PandasDtype)
-        or isinstance(left, StringDtype)
-    ):
+    elif isinstance(left, (CategoricalDtype, PandasDtype, StringDtype)):
         left = repr(left)
 
     if isinstance(right, np.ndarray):
         right = pprint_thing(right)
-    elif (
-        isinstance(right, CategoricalDtype)
-        or isinstance(right, PandasDtype)
-        or isinstance(right, StringDtype)
-    ):
+    elif isinstance(right, (CategoricalDtype, PandasDtype, StringDtype)):
         right = repr(right)
 
     msg += f"""
diff --git a/pandas/core/indexes/base.py b/pandas/core/indexes/base.py
index 27672c82fdf15..30861fd533bc2 100644
--- a/pandas/core/indexes/base.py
+++ b/pandas/core/indexes/base.py
@@ -1648,7 +1648,7 @@ def _get_default_index_names(
         from pandas.core.indexes.multi import MultiIndex
 
         if names is not None:
-            if isinstance(names, str) or isinstance(names, int):
+            if isinstance(names, (int, str)):
                 names = [names]
 
         if not isinstance(names, list) and names is not None:
diff --git a/pyproject.toml b/pyproject.toml
index 912833f15f9a6..eca46b9417fbe 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -101,7 +101,6 @@ disable = [
 
   # pylint type "R": refactor, for bad code smell
   "comparison-with-itself",
-  "consider-merging-isinstance",
   "consider-using-ternary",
   "consider-using-with",
   "cyclic-import",