diff --git a/slowapi/wrappers.py b/slowapi/wrappers.py
index 4c39744..a149f9b 100644
--- a/slowapi/wrappers.py
+++ b/slowapi/wrappers.py
@@ -29,7 +29,9 @@ class Limit(object):
         self.methods = methods
         self.error_message = error_message
         self.exempt_when = exempt_when
-        self._exempt_when_takes_request = len(inspect.signature(self.exempt_when).parameters) == 1
+        self._exempt_when_takes_request = (
+            len(inspect.signature(self.exempt_when).parameters) == 1
+        )
         self.cost = cost
         self.override_defaults = override_defaults