diff --git a/amqtt/client.py b/amqtt/client.py
index b6611779..ec018d3e 100644
--- a/amqtt/client.py
+++ b/amqtt/client.py
@@ -244,7 +244,7 @@ async def reconnect(self, cleansession=None):
                         "Maximum number of connection attempts reached. Reconnection aborted"
                     )
                     raise ConnectException("Too many connection attempts failed") from e
-                exp = 2 ** nb_attempt
+                exp = 2**nb_attempt
                 delay = exp if exp < reconnect_max_interval else reconnect_max_interval
                 self.logger.debug("Waiting %d second before next attempt" % delay)
                 await asyncio.sleep(delay, loop=self._loop)
diff --git a/docs/conf.py b/docs/conf.py
index 3283c91a..c50a51d2 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -306,7 +306,6 @@ def setup(app):
         # app.add_javascript("custom.js")
         app.add_stylesheet("theme_overrides.css")
 
-
 else:
     # Override default css to get a larger width for ReadTheDoc build
     html_context = {
diff --git a/tests/plugins/test_plugins.py b/tests/plugins/test_plugins.py
index bfacac3b..284421e9 100644
--- a/tests/plugins/test_plugins.py
+++ b/tests/plugins/test_plugins.py
@@ -29,11 +29,13 @@ def _verify_module(module, plugin_module_name):
             continue
 
         obj = clazz(_TestContext())
-        with pytest.raises(AttributeError, match=f"'{name}' object has no attribute '{_INVALID_METHOD}'"):
+        with pytest.raises(
+            AttributeError,
+            match=f"'{name}' object has no attribute '{_INVALID_METHOD}'",
+        ):
             getattr(obj, _INVALID_METHOD)
         assert hasattr(obj, _INVALID_METHOD) is False
 
-
     for name, obj in inspect.getmembers(module, inspect.ismodule):
         _verify_module(obj, plugin_module_name)