diff --git a/UnleashClient/__init__.py b/UnleashClient/__init__.py
index 5b94799d..89bf9fb2 100644
--- a/UnleashClient/__init__.py
+++ b/UnleashClient/__init__.py
@@ -13,7 +13,13 @@
 from apscheduler.triggers.interval import IntervalTrigger
 
 from UnleashClient.api import register_client
-from UnleashClient.constants import DISABLED_VARIATION, ETAG, METRIC_LAST_SENT_TIME, REQUEST_TIMEOUT, REQUEST_RETRIES
+from UnleashClient.constants import (
+    DISABLED_VARIATION,
+    ETAG,
+    METRIC_LAST_SENT_TIME,
+    REQUEST_RETRIES,
+    REQUEST_TIMEOUT,
+)
 from UnleashClient.events import UnleashEvent, UnleashEventType
 from UnleashClient.features import Feature
 from UnleashClient.loader import load_features
@@ -230,7 +236,7 @@ def initialize_client(self, fetch_toggles: bool = True) -> None:
                     "custom_options": self.unleash_custom_options,
                     "features": self.features,
                     "cache": self.cache,
-                    "request_timeout": self.unleash_request_timeout
+                    "request_timeout": self.unleash_request_timeout,
                 }
 
                 # Register app
@@ -243,7 +249,7 @@ def initialize_client(self, fetch_toggles: bool = True) -> None:
                         self.unleash_custom_headers,
                         self.unleash_custom_options,
                         self.strategy_mapping,
-                        self.unleash_request_timeout
+                        self.unleash_request_timeout,
                     )
 
                 if fetch_toggles:
diff --git a/UnleashClient/periodic_tasks/send_metrics.py b/UnleashClient/periodic_tasks/send_metrics.py
index 8a38c539..3df7ec7d 100644
--- a/UnleashClient/periodic_tasks/send_metrics.py
+++ b/UnleashClient/periodic_tasks/send_metrics.py
@@ -15,7 +15,7 @@ def aggregate_and_send_metrics(
     custom_options: dict,
     features: dict,
     cache: BaseCache,
-    request_timeout: int
+    request_timeout: int,
 ) -> None:
     feature_stats_list = []
 
@@ -45,7 +45,9 @@ def aggregate_and_send_metrics(
     }
 
     if feature_stats_list:
-        send_metrics(url, metrics_request, custom_headers, custom_options, request_timeout)
+        send_metrics(
+            url, metrics_request, custom_headers, custom_options, request_timeout
+        )
         cache.set(METRIC_LAST_SENT_TIME, datetime.now(timezone.utc))
     else:
         LOGGER.debug("No feature flags with metrics, skipping metrics submission.")
diff --git a/tests/unit_tests/api/test_feature.py b/tests/unit_tests/api/test_feature.py
index 806c444a..db910686 100644
--- a/tests/unit_tests/api/test_feature.py
+++ b/tests/unit_tests/api/test_feature.py
@@ -13,9 +13,9 @@
     INSTANCE_ID,
     PROJECT_NAME,
     PROJECT_URL,
-    URL,
+    REQUEST_RETRIES,
     REQUEST_TIMEOUT,
-    REQUEST_RETRIES
+    URL,
 )
 from UnleashClient.api import get_feature_toggles
 from UnleashClient.constants import FEATURES_URL
@@ -48,7 +48,13 @@ def test_get_feature_toggle(response, status, calls, expected):
     )
 
     (result, etag) = get_feature_toggles(
-        URL, APP_NAME, INSTANCE_ID, CUSTOM_HEADERS, CUSTOM_OPTIONS, REQUEST_TIMEOUT, REQUEST_RETRIES
+        URL,
+        APP_NAME,
+        INSTANCE_ID,
+        CUSTOM_HEADERS,
+        CUSTOM_OPTIONS,
+        REQUEST_TIMEOUT,
+        REQUEST_RETRIES,
     )
 
     assert len(responses.calls) == calls
@@ -66,7 +72,14 @@ def test_get_feature_toggle_project():
     )
 
     (result, etag) = get_feature_toggles(
-        URL, APP_NAME, INSTANCE_ID, CUSTOM_HEADERS, CUSTOM_OPTIONS, REQUEST_TIMEOUT, REQUEST_RETRIES, PROJECT_NAME
+        URL,
+        APP_NAME,
+        INSTANCE_ID,
+        CUSTOM_HEADERS,
+        CUSTOM_OPTIONS,
+        REQUEST_TIMEOUT,
+        REQUEST_RETRIES,
+        PROJECT_NAME,
     )
 
     assert len(responses.calls) == 1
@@ -81,7 +94,14 @@ def test_get_feature_toggle_failed_etag():
     )
 
     (result, etag) = get_feature_toggles(
-        URL, APP_NAME, INSTANCE_ID, CUSTOM_HEADERS, CUSTOM_OPTIONS, REQUEST_TIMEOUT, REQUEST_RETRIES, PROJECT_NAME,
+        URL,
+        APP_NAME,
+        INSTANCE_ID,
+        CUSTOM_HEADERS,
+        CUSTOM_OPTIONS,
+        REQUEST_TIMEOUT,
+        REQUEST_RETRIES,
+        PROJECT_NAME,
     )
 
     assert len(responses.calls) == 4
diff --git a/tests/unit_tests/api/test_metrics.py b/tests/unit_tests/api/test_metrics.py
index 2c164c94..2e3d3567 100644
--- a/tests/unit_tests/api/test_metrics.py
+++ b/tests/unit_tests/api/test_metrics.py
@@ -3,7 +3,12 @@
 from requests import ConnectionError
 
 from tests.utilities.mocks.mock_metrics import MOCK_METRICS_REQUEST
-from tests.utilities.testing_constants import CUSTOM_HEADERS, CUSTOM_OPTIONS, URL, REQUEST_TIMEOUT
+from tests.utilities.testing_constants import (
+    CUSTOM_HEADERS,
+    CUSTOM_OPTIONS,
+    REQUEST_TIMEOUT,
+    URL,
+)
 from UnleashClient.api import send_metrics
 from UnleashClient.constants import METRICS_URL
 
@@ -27,7 +32,9 @@
 def test_send_metrics(payload, status, expected):
     responses.add(responses.POST, FULL_METRICS_URL, **payload, status=status)
 
-    result = send_metrics(URL, MOCK_METRICS_REQUEST, CUSTOM_HEADERS, CUSTOM_OPTIONS, REQUEST_TIMEOUT)
+    result = send_metrics(
+        URL, MOCK_METRICS_REQUEST, CUSTOM_HEADERS, CUSTOM_OPTIONS, REQUEST_TIMEOUT
+    )
 
     assert len(responses.calls) == 1
     assert expected(result)
diff --git a/tests/unit_tests/api/test_register.py b/tests/unit_tests/api/test_register.py
index 1bd696b6..7ee670a6 100644
--- a/tests/unit_tests/api/test_register.py
+++ b/tests/unit_tests/api/test_register.py
@@ -9,8 +9,8 @@
     DEFAULT_STRATEGY_MAPPING,
     INSTANCE_ID,
     METRICS_INTERVAL,
+    REQUEST_TIMEOUT,
     URL,
-    REQUEST_TIMEOUT
 )
 from UnleashClient.api import register_client
 from UnleashClient.constants import REGISTER_URL
@@ -43,7 +43,7 @@ def test_register_client(payload, status, expected):
         CUSTOM_HEADERS,
         CUSTOM_OPTIONS,
         DEFAULT_STRATEGY_MAPPING,
-        REQUEST_TIMEOUT
+        REQUEST_TIMEOUT,
     )
 
     assert len(responses.calls) == 1
diff --git a/tests/unit_tests/periodic/test_aggregate_and_send_metrics.py b/tests/unit_tests/periodic/test_aggregate_and_send_metrics.py
index 66271576..25dd36dd 100644
--- a/tests/unit_tests/periodic/test_aggregate_and_send_metrics.py
+++ b/tests/unit_tests/periodic/test_aggregate_and_send_metrics.py
@@ -10,8 +10,8 @@
     CUSTOM_OPTIONS,
     INSTANCE_ID,
     IP_LIST,
+    REQUEST_TIMEOUT,
     URL,
-    REQUEST_TIMEOUT
 )
 from UnleashClient.cache import FileCache
 from UnleashClient.constants import METRIC_LAST_SENT_TIME, METRICS_URL
@@ -56,7 +56,14 @@ def test_aggregate_and_send_metrics():
     features = {"My Feature1": my_feature1, "My Feature 2": my_feature2}
 
     aggregate_and_send_metrics(
-        URL, APP_NAME, INSTANCE_ID, CUSTOM_HEADERS, CUSTOM_OPTIONS, features, cache, REQUEST_TIMEOUT
+        URL,
+        APP_NAME,
+        INSTANCE_ID,
+        CUSTOM_HEADERS,
+        CUSTOM_OPTIONS,
+        features,
+        cache,
+        REQUEST_TIMEOUT,
     )
 
     assert len(responses.calls) == 1
@@ -89,7 +96,14 @@ def test_no_metrics():
     features = {"My Feature1": my_feature1}
 
     aggregate_and_send_metrics(
-        URL, APP_NAME, INSTANCE_ID, CUSTOM_HEADERS, CUSTOM_OPTIONS, features, cache, REQUEST_TIMEOUT
+        URL,
+        APP_NAME,
+        INSTANCE_ID,
+        CUSTOM_HEADERS,
+        CUSTOM_OPTIONS,
+        features,
+        cache,
+        REQUEST_TIMEOUT,
     )
 
     assert len(responses.calls) == 0
diff --git a/tests/unit_tests/periodic/test_fetch_and_load.py b/tests/unit_tests/periodic/test_fetch_and_load.py
index 773a01b8..3db4cd59 100644
--- a/tests/unit_tests/periodic/test_fetch_and_load.py
+++ b/tests/unit_tests/periodic/test_fetch_and_load.py
@@ -13,9 +13,9 @@
     INSTANCE_ID,
     PROJECT_NAME,
     PROJECT_URL,
-    URL,
+    REQUEST_RETRIES,
     REQUEST_TIMEOUT,
-    REQUEST_RETRIES
+    URL,
 )
 from UnleashClient.constants import ETAG, FEATURES_URL
 from UnleashClient.features import Feature
diff --git a/tests/unit_tests/test_client.py b/tests/unit_tests/test_client.py
index 0c2475e6..f2bcda83 100644
--- a/tests/unit_tests/test_client.py
+++ b/tests/unit_tests/test_client.py
@@ -31,9 +31,9 @@
     PROJECT_URL,
     REFRESH_INTERVAL,
     REFRESH_JITTER,
-    URL,
+    REQUEST_RETRIES,
     REQUEST_TIMEOUT,
-    REQUEST_RETRIES
+    URL,
 )
 from UnleashClient import INSTANCES, UnleashClient
 from UnleashClient.cache import FileCache
@@ -163,7 +163,7 @@ def test_UC_initialize_full():
         CUSTOM_HEADERS,
         CUSTOM_OPTIONS,
         REQUEST_TIMEOUT,
-        REQUEST_RETRIES
+        REQUEST_RETRIES,
     )
     assert client.unleash_instance_id == INSTANCE_ID
     assert client.unleash_refresh_interval == REFRESH_INTERVAL