diff --git a/pandas/tests/indexes/interval/test_setops.py b/pandas/tests/indexes/interval/test_setops.py
index 3246ac6bafde9..d9359d717de1d 100644
--- a/pandas/tests/indexes/interval/test_setops.py
+++ b/pandas/tests/indexes/interval/test_setops.py
@@ -180,8 +180,8 @@ def test_set_incompatible_types(self, closed, op_name, sort):
         # GH 19016: incompatible dtypes
         other = interval_range(Timestamp("20180101"), periods=9, closed=closed)
         msg = (
-            "can only do {op} between two IntervalIndex objects that have "
+            f"can only do {op_name} between two IntervalIndex objects that have "
             "compatible dtypes"
-        ).format(op=op_name)
+        )
         with pytest.raises(TypeError, match=msg):
             set_op(other, sort=sort)
diff --git a/pandas/tests/indexes/multi/test_compat.py b/pandas/tests/indexes/multi/test_compat.py
index 9a76f0623eb31..ef549beccda5d 100644
--- a/pandas/tests/indexes/multi/test_compat.py
+++ b/pandas/tests/indexes/multi/test_compat.py
@@ -29,7 +29,7 @@ def test_numeric_compat(idx):
 
 @pytest.mark.parametrize("method", ["all", "any"])
 def test_logical_compat(idx, method):
-    msg = "cannot perform {method}".format(method=method)
+    msg = f"cannot perform {method}"
 
     with pytest.raises(TypeError, match=msg):
         getattr(idx, method)()
diff --git a/pandas/tests/indexes/period/test_constructors.py b/pandas/tests/indexes/period/test_constructors.py
index fcbadce3d63b1..418f53591b913 100644
--- a/pandas/tests/indexes/period/test_constructors.py
+++ b/pandas/tests/indexes/period/test_constructors.py
@@ -364,7 +364,7 @@ def test_constructor_year_and_quarter(self):
         year = pd.Series([2001, 2002, 2003])
         quarter = year - 2000
         idx = PeriodIndex(year=year, quarter=quarter)
-        strs = ["{t[0]:d}Q{t[1]:d}".format(t=t) for t in zip(quarter, year)]
+        strs = [f"{t[0]:d}Q{t[1]:d}" for t in zip(quarter, year)]
         lops = list(map(Period, strs))
         p = PeriodIndex(lops)
         tm.assert_index_equal(p, idx)
diff --git a/pandas/tests/indexes/timedeltas/test_constructors.py b/pandas/tests/indexes/timedeltas/test_constructors.py
index 0de10b5d82171..8e54561df1624 100644
--- a/pandas/tests/indexes/timedeltas/test_constructors.py
+++ b/pandas/tests/indexes/timedeltas/test_constructors.py
@@ -155,7 +155,7 @@ def test_constructor(self):
     def test_constructor_iso(self):
         # GH #21877
         expected = timedelta_range("1s", periods=9, freq="s")
-        durations = ["P0DT0H0M{}S".format(i) for i in range(1, 10)]
+        durations = [f"P0DT0H0M{i}S" for i in range(1, 10)]
         result = to_timedelta(durations)
         tm.assert_index_equal(result, expected)
 
diff --git a/pandas/tests/indexing/test_floats.py b/pandas/tests/indexing/test_floats.py
index f783c3516e357..80a4d81b20a13 100644
--- a/pandas/tests/indexing/test_floats.py
+++ b/pandas/tests/indexing/test_floats.py
@@ -53,8 +53,8 @@ def test_scalar_error(self, index_func):
             s.iloc[3.0]
 
         msg = (
-            "cannot do positional indexing on {klass} with these "
-            r"indexers \[3\.0\] of type float".format(klass=type(i).__name__)
+            fr"cannot do positional indexing on {type(i).__name__} with these "
+            r"indexers \[3\.0\] of type float"
         )
         with pytest.raises(TypeError, match=msg):
             s.iloc[3.0] = 0
@@ -95,10 +95,10 @@ def test_scalar_non_numeric(self, index_func):
                     error = TypeError
                     msg = (
                         r"cannot do (label|positional) indexing "
-                        r"on {klass} with these indexers \[3\.0\] of "
+                        fr"on {type(i).__name__} with these indexers \[3\.0\] of "
                         r"type float|"
                         "Cannot index by location index with a "
-                        "non-integer key".format(klass=type(i).__name__)
+                        "non-integer key"
                     )
                 with pytest.raises(error, match=msg):
                     idxr(s)[3.0]
@@ -116,8 +116,8 @@ def test_scalar_non_numeric(self, index_func):
                 error = TypeError
                 msg = (
                     r"cannot do (label|positional) indexing "
-                    r"on {klass} with these indexers \[3\.0\] of "
-                    r"type float".format(klass=type(i).__name__)
+                    fr"on {type(i).__name__} with these indexers \[3\.0\] of "
+                    "type float"
                 )
             with pytest.raises(error, match=msg):
                 s.loc[3.0]
@@ -128,8 +128,8 @@ def test_scalar_non_numeric(self, index_func):
             # setting with a float fails with iloc
             msg = (
                 r"cannot do (label|positional) indexing "
-                r"on {klass} with these indexers \[3\.0\] of "
-                r"type float".format(klass=type(i).__name__)
+                fr"on {type(i).__name__} with these indexers \[3\.0\] of "
+                "type float"
             )
             with pytest.raises(TypeError, match=msg):
                 s.iloc[3.0] = 0
@@ -165,8 +165,8 @@ def test_scalar_non_numeric(self, index_func):
         s[3]
         msg = (
             r"cannot do (label|positional) indexing "
-            r"on {klass} with these indexers \[3\.0\] of "
-            r"type float".format(klass=type(i).__name__)
+            fr"on {type(i).__name__} with these indexers \[3\.0\] of "
+            "type float"
         )
         with pytest.raises(TypeError, match=msg):
             s[3.0]
@@ -181,12 +181,10 @@ def test_scalar_with_mixed(self):
         for idxr in [lambda x: x, lambda x: x.iloc]:
 
             msg = (
-                r"cannot do label indexing "
-                r"on {klass} with these indexers \[1\.0\] of "
+                "cannot do label indexing "
+                fr"on {Index.__name__} with these indexers \[1\.0\] of "
                 r"type float|"
-                "Cannot index by location index with a non-integer key".format(
-                    klass=Index.__name__
-                )
+                "Cannot index by location index with a non-integer key"
             )
             with pytest.raises(TypeError, match=msg):
                 idxr(s2)[1.0]
@@ -203,9 +201,9 @@ def test_scalar_with_mixed(self):
         for idxr in [lambda x: x]:
 
             msg = (
-                r"cannot do label indexing "
-                r"on {klass} with these indexers \[1\.0\] of "
-                r"type float".format(klass=Index.__name__)
+                "cannot do label indexing "
+                fr"on {Index.__name__} with these indexers \[1\.0\] of "
+                "type float"
             )
             with pytest.raises(TypeError, match=msg):
                 idxr(s3)[1.0]
@@ -321,9 +319,9 @@ def test_scalar_float(self):
                 s.iloc[3.0]
 
             msg = (
-                r"cannot do positional indexing "
-                r"on {klass} with these indexers \[3\.0\] of "
-                r"type float".format(klass=Float64Index.__name__)
+                "cannot do positional indexing "
+                fr"on {Float64Index.__name__} with these indexers \[3\.0\] of "
+                "type float"
             )
             with pytest.raises(TypeError, match=msg):
                 s2.iloc[3.0] = 0
@@ -355,8 +353,8 @@ def test_slice_non_numeric(self, index_func):
 
                 msg = (
                     "cannot do positional indexing "
-                    r"on {klass} with these indexers \[(3|4)\.0\] of "
-                    "type float".format(klass=type(index).__name__)
+                    fr"on {type(index).__name__} with these indexers \[(3|4)\.0\] of "
+                    "type float"
                 )
                 with pytest.raises(TypeError, match=msg):
                     s.iloc[l]
@@ -365,9 +363,9 @@ def test_slice_non_numeric(self, index_func):
 
                     msg = (
                         "cannot do (slice|positional) indexing "
-                        r"on {klass} with these indexers "
+                        fr"on {type(index).__name__} with these indexers "
                         r"\[(3|4)(\.0)?\] "
-                        r"of type (float|int)".format(klass=type(index).__name__)
+                        r"of type (float|int)"
                     )
                     with pytest.raises(TypeError, match=msg):
                         idxr(s)[l]
@@ -377,8 +375,8 @@ def test_slice_non_numeric(self, index_func):
 
                 msg = (
                     "cannot do positional indexing "
-                    r"on {klass} with these indexers \[(3|4)\.0\] of "
-                    "type float".format(klass=type(index).__name__)
+                    fr"on {type(index).__name__} with these indexers \[(3|4)\.0\] of "
+                    "type float"
                 )
                 with pytest.raises(TypeError, match=msg):
                     s.iloc[l] = 0
@@ -386,9 +384,9 @@ def test_slice_non_numeric(self, index_func):
                 for idxr in [lambda x: x.loc, lambda x: x.iloc, lambda x: x]:
                     msg = (
                         "cannot do (slice|positional) indexing "
-                        r"on {klass} with these indexers "
+                        fr"on {type(index).__name__} with these indexers "
                         r"\[(3|4)(\.0)?\] "
-                        r"of type (float|int)".format(klass=type(index).__name__)
+                        r"of type (float|int)"
                     )
                     with pytest.raises(TypeError, match=msg):
                         idxr(s)[l] = 0
@@ -427,8 +425,8 @@ def test_slice_integer(self):
                 # positional indexing
                 msg = (
                     "cannot do slice indexing "
-                    r"on {klass} with these indexers \[(3|4)\.0\] of "
-                    "type float".format(klass=type(index).__name__)
+                    fr"on {type(index).__name__} with these indexers \[(3|4)\.0\] of "
+                    "type float"
                 )
                 with pytest.raises(TypeError, match=msg):
                     s[l]
@@ -451,8 +449,8 @@ def test_slice_integer(self):
             # positional indexing
             msg = (
                 "cannot do slice indexing "
-                r"on {klass} with these indexers \[-6\.0\] of "
-                "type float".format(klass=type(index).__name__)
+                fr"on {type(index).__name__} with these indexers \[-6\.0\] of "
+                "type float"
             )
             with pytest.raises(TypeError, match=msg):
                 s[slice(-6.0, 6.0)]
@@ -477,8 +475,8 @@ def test_slice_integer(self):
                 # positional indexing
                 msg = (
                     "cannot do slice indexing "
-                    r"on {klass} with these indexers \[(2|3)\.5\] of "
-                    "type float".format(klass=type(index).__name__)
+                    fr"on {type(index).__name__} with these indexers \[(2|3)\.5\] of "
+                    "type float"
                 )
                 with pytest.raises(TypeError, match=msg):
                     s[l]
@@ -495,8 +493,8 @@ def test_slice_integer(self):
                 # positional indexing
                 msg = (
                     "cannot do slice indexing "
-                    r"on {klass} with these indexers \[(3|4)\.0\] of "
-                    "type float".format(klass=type(index).__name__)
+                    fr"on {type(index).__name__} with these indexers \[(3|4)\.0\] of "
+                    "type float"
                 )
                 with pytest.raises(TypeError, match=msg):
                     s[l] = 0
@@ -518,8 +516,8 @@ def test_integer_positional_indexing(self):
                 klass = RangeIndex
                 msg = (
                     "cannot do (slice|positional) indexing "
-                    r"on {klass} with these indexers \[(2|4)\.0\] of "
-                    "type float".format(klass=klass.__name__)
+                    fr"on {klass.__name__} with these indexers \[(2|4)\.0\] of "
+                    "type float"
                 )
                 with pytest.raises(TypeError, match=msg):
                     idxr(s)[l]
@@ -546,8 +544,8 @@ def f(idxr):
                 # positional indexing
                 msg = (
                     "cannot do slice indexing "
-                    r"on {klass} with these indexers \[(0|1)\.0\] of "
-                    "type float".format(klass=type(index).__name__)
+                    fr"on {type(index).__name__} with these indexers \[(0|1)\.0\] of "
+                    "type float"
                 )
                 with pytest.raises(TypeError, match=msg):
                     s[l]
@@ -561,8 +559,8 @@ def f(idxr):
             # positional indexing
             msg = (
                 "cannot do slice indexing "
-                r"on {klass} with these indexers \[-10\.0\] of "
-                "type float".format(klass=type(index).__name__)
+                fr"on {type(index).__name__} with these indexers \[-10\.0\] of "
+                "type float"
             )
             with pytest.raises(TypeError, match=msg):
                 s[slice(-10.0, 10.0)]
@@ -580,8 +578,8 @@ def f(idxr):
                 # positional indexing
                 msg = (
                     "cannot do slice indexing "
-                    r"on {klass} with these indexers \[0\.5\] of "
-                    "type float".format(klass=type(index).__name__)
+                    fr"on {type(index).__name__} with these indexers \[0\.5\] of "
+                    "type float"
                 )
                 with pytest.raises(TypeError, match=msg):
                     s[l]
@@ -597,8 +595,8 @@ def f(idxr):
                 # positional indexing
                 msg = (
                     "cannot do slice indexing "
-                    r"on {klass} with these indexers \[(3|4)\.0\] of "
-                    "type float".format(klass=type(index).__name__)
+                    fr"on {type(index).__name__} with these indexers \[(3|4)\.0\] of "
+                    "type float"
                 )
                 with pytest.raises(TypeError, match=msg):
                     s[l] = 0