diff --git a/src/_pytest/doctest.py b/src/_pytest/doctest.py
index 0784f431b..7d37be2ac 100644
--- a/src/_pytest/doctest.py
+++ b/src/_pytest/doctest.py
@@ -656,7 +656,7 @@ def _init_checker_class() -> Type["doctest.OutputChecker"]:
                 precision = 0 if fraction is None else len(fraction)
                 if exponent is not None:
                     precision -= int(exponent)
-                if float(w.group()) == approx(float(g.group()), abs=10 ** -precision):
+                if float(w.group()) == approx(float(g.group()), abs=10**-precision):
                     # They're close enough. Replace the text we actually
                     # got with the text we want, so that it will match when we
                     # check the string literally.
diff --git a/testing/io/test_terminalwriter.py b/testing/io/test_terminalwriter.py
index 4866c94a5..6fe718b53 100644
--- a/testing/io/test_terminalwriter.py
+++ b/testing/io/test_terminalwriter.py
@@ -56,7 +56,7 @@ def test_terminalwriter_not_unicode() -> None:
     file = io.TextIOWrapper(buffer, encoding="cp1252")
     tw = terminalwriter.TerminalWriter(file)
     tw.write("hello 🌀 wôrld אבג", flush=True)
-    assert buffer.getvalue() == br"hello \U0001f300 w\xf4rld \u05d0\u05d1\u05d2"
+    assert buffer.getvalue() == rb"hello \U0001f300 w\xf4rld \u05d0\u05d1\u05d2"
 
 
 win32 = int(sys.platform == "win32")
diff --git a/testing/python/approx.py b/testing/python/approx.py
index f417a5992..eb9bcd874 100644
--- a/testing/python/approx.py
+++ b/testing/python/approx.py
@@ -771,7 +771,7 @@ class TestApprox:
     def test_expected_value_type_error(self, x, name):
         with pytest.raises(
             TypeError,
-            match=fr"pytest.approx\(\) does not support nested {name}:",
+            match=rf"pytest.approx\(\) does not support nested {name}:",
         ):
             approx(x)
 
diff --git a/testing/test_assertrewrite.py b/testing/test_assertrewrite.py
index dd1573935..ae18b4be3 100644
--- a/testing/test_assertrewrite.py
+++ b/testing/test_assertrewrite.py
@@ -1313,7 +1313,7 @@ class TestIssue2121:
 
 
 @pytest.mark.skipif(
-    sys.maxsize <= (2 ** 31 - 1), reason="Causes OverflowError on 32bit systems"
+    sys.maxsize <= (2**31 - 1), reason="Causes OverflowError on 32bit systems"
 )
 @pytest.mark.parametrize("offset", [-1, +1])
 def test_source_mtime_long_long(pytester: Pytester, offset) -> None:
@@ -1332,7 +1332,7 @@ def test_source_mtime_long_long(pytester: Pytester, offset) -> None:
     # use unsigned long timestamp which overflows signed long,
     # which was the cause of the bug
     # +1 offset also tests masking of 0xFFFFFFFF
-    timestamp = 2 ** 32 + offset
+    timestamp = 2**32 + offset
     os.utime(str(p), (timestamp, timestamp))
     result = pytester.runpytest()
     assert result.ret == 0