diff --git a/test/io/postgrest.py b/test/io/postgrest.py
index dd1af32ba..531a05bee 100644
--- a/test/io/postgrest.py
+++ b/test/io/postgrest.py
@@ -63,9 +63,9 @@ class PostgrestProcess:
         output = []
         for _ in range(10):
             self.process.stdout.flush()
-            l = self.process.stdout.readline()
-            if l:
-                output.append(l.decode())
+            line = self.process.stdout.readline()
+            if line:
+                output.append(line.decode())
                 if len(output) >= nlines:
                     break
             time.sleep(0.1)
@@ -152,7 +152,7 @@ def run(
             process.terminate()
             try:
                 process.wait(timeout=1)
-            except:
+            except subprocess.TimeoutExpired:
                 process.kill()
                 process.wait()
 
diff --git a/test/io/test_io.py b/test/io/test_io.py
index 4c4afe4db..e1275cbd2 100644
--- a/test/io/test_io.py
+++ b/test/io/test_io.py
@@ -79,9 +79,8 @@ def test_jwt_errors(defaultenv):
 
     env = {**defaultenv, "PGRST_JWT_SECRET": SECRET, "PGRST_JWT_AUD": "io tests"}
 
-    relativeSeconds = lambda sec: int(
-        (datetime.now(timezone.utc) + timedelta(seconds=sec)).timestamp()
-    )
+    def relativeSeconds(sec):
+        return int((datetime.now(timezone.utc) + timedelta(seconds=sec)).timestamp())
 
     with run(env=env) as postgrest:
         headers = jwtauthheader({}, "other secret")
@@ -328,7 +327,7 @@ def test_flush_pool_no_interrupt(defaultenv):
 def test_random_port_bound(defaultenv):
     "PostgREST should bind to a random port when PGRST_SERVER_PORT is 0."
 
-    with run(env=defaultenv, port="0") as postgrest:
+    with run(env=defaultenv, port="0"):
         assert True  # liveness check is done by run(), so we just need to check that it doesn't fail
 
 
@@ -1394,9 +1393,6 @@ def test_get_pgrst_version_with_keyval_connection_string(defaultenv):
 
 def test_log_postgrest_version(defaultenv):
     "Should show the PostgREST version in the logs"
-
-    env = {**defaultenv, "PGRST_LOG_LEVEL": "crit"}
-
     with run(env=defaultenv, no_startup_stdout=False) as postgrest:
         version = postgrest.session.head("/").headers["Server"].split("/")[1]
 
@@ -1815,14 +1811,13 @@ def test_jwt_cache_purges_expired_entries(defaultenv):
     # The verification of actual cache size reduction is done manually, see https://github.com/PostgREST/postgrest/pull/3801#issuecomment-2620776041
     # This test is written for code coverage of purgeExpired function
 
-    relativeSeconds = lambda sec: int(
-        (datetime.now(timezone.utc) + timedelta(seconds=sec)).timestamp()
-    )
+    def relativeSeconds(sec):
+        return int((datetime.now(timezone.utc) + timedelta(seconds=sec)).timestamp())
 
-    headers = lambda sec: jwtauthheader(
-        {"role": "postgrest_test_author", "exp": relativeSeconds(sec)},
-        SECRET,
-    )
+    def headers(sec):
+        return jwtauthheader(
+            {"role": "postgrest_test_author", "exp": relativeSeconds(sec)}, SECRET
+        )
 
     env = {
         **defaultenv,
diff --git a/test/io/test_sanity.py b/test/io/test_sanity.py
index fe3213587..be90057ea 100644
--- a/test/io/test_sanity.py
+++ b/test/io/test_sanity.py
@@ -21,5 +21,5 @@ def test_plain_get(defaultenv):
 def test_no_pool_connection_available(defaultenv):
     "no_pool_connection_available option is functional"
     with run(env=defaultenv, no_pool_connection_available=True) as postgrest:
-        with pytest.raises(Exception) as e:
+        with pytest.raises(Exception):
             postgrest.session.get("/projects", timeout=1)