diff --git a/pyproject.toml b/pyproject.toml
index 065382205..a0b37b966 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -222,6 +222,8 @@ extend-select = [
     "D",
     # flake8-future-annotations
     "FA",
+    # flynt
+    "FLY",
     # refurb
     "FURB",
     # isort
diff --git a/scrapy/pqueues.py b/scrapy/pqueues.py
index 5b2f81335..a04e0107b 100644
--- a/scrapy/pqueues.py
+++ b/scrapy/pqueues.py
@@ -34,7 +34,7 @@ def _path_safe(text: str) -> str:
     # as we replace some letters we can get collision for different slots
     # add we add unique part
     unique_slot = hashlib.md5(text.encode("utf8")).hexdigest()  # noqa: S324
-    return "-".join([pathable_slot, unique_slot])
+    return f"{pathable_slot}-{unique_slot}"
 
 
 class QueueProtocol(Protocol):
diff --git a/tests/test_spidermiddleware_referer.py b/tests/test_spidermiddleware_referer.py
index 23b0c17c6..cefd33e4e 100644
--- a/tests/test_spidermiddleware_referer.py
+++ b/tests/test_spidermiddleware_referer.py
@@ -891,14 +891,7 @@ class TestSettingsPolicyByName(TestCase):
         # test parsing without space(s) after the comma
         settings1 = Settings(
             {
-                "REFERRER_POLICY": ",".join(
-                    [
-                        "some-custom-unknown-policy",
-                        POLICY_SAME_ORIGIN,
-                        POLICY_STRICT_ORIGIN_WHEN_CROSS_ORIGIN,
-                        "another-custom-unknown-policy",
-                    ]
-                )
+                "REFERRER_POLICY": f"some-custom-unknown-policy,{POLICY_SAME_ORIGIN},{POLICY_STRICT_ORIGIN_WHEN_CROSS_ORIGIN},another-custom-unknown-policy"
             }
         )
         mw1 = RefererMiddleware(settings1)
@@ -907,13 +900,7 @@ class TestSettingsPolicyByName(TestCase):
         # test parsing with space(s) after the comma
         settings2 = Settings(
             {
-                "REFERRER_POLICY": ",    ".join(
-                    [
-                        POLICY_STRICT_ORIGIN_WHEN_CROSS_ORIGIN,
-                        "another-custom-unknown-policy",
-                        POLICY_UNSAFE_URL,
-                    ]
-                )
+                "REFERRER_POLICY": f"{POLICY_STRICT_ORIGIN_WHEN_CROSS_ORIGIN},    another-custom-unknown-policy,    {POLICY_UNSAFE_URL}"
             }
         )
         mw2 = RefererMiddleware(settings2)
@@ -922,13 +909,7 @@ class TestSettingsPolicyByName(TestCase):
     def test_multiple_policy_tokens_all_invalid(self):
         settings = Settings(
             {
-                "REFERRER_POLICY": ",".join(
-                    [
-                        "some-custom-unknown-policy",
-                        "another-custom-unknown-policy",
-                        "yet-another-custom-unknown-policy",
-                    ]
-                )
+                "REFERRER_POLICY": "some-custom-unknown-policy,another-custom-unknown-policy,yet-another-custom-unknown-policy"
             }
         )
         with self.assertRaises(RuntimeError):