ok I guess black and flake8 disagree, so we have to go with black here (since it's not configurable)

Author: radix

effect/_test_utils.py

@@ -52,7 +52,7 @@ def match(self, actual):
             traceback.TracebackException.from_exception(self.expected).format()
         )
         new = list(traceback.TracebackException.from_exception(actual).format())
-        tail_equals = lambda a, b: a == b[-len(a):]
+        tail_equals = lambda a, b: a == b[-len(a) :]
         if not tail_equals(expected[1:], new[1:]):
             return ReraisedTracebackMismatch(expected_tb=expected, got_tb=new)
 

effect/testing.py

@@ -268,7 +268,7 @@ def resolve_effect(effect, result, is_error=False):
         is_error, result = guard(cb, result)
         if type(result) is Effect:
             return Effect(
-                result.intent, callbacks=result.callbacks + effect.callbacks[i + 1:]
+                result.intent, callbacks=result.callbacks + effect.callbacks[i + 1 :]
             )
     if is_error:
         raise result

setup.cfg

@@ -6,4 +6,4 @@ universal=1
 
 [flake8]
 max-line-length = 100
-ignore = E131,E301,E302,E731,W503,E701,E704,E722
+ignore = E131,E301,E302,E731,W503,E701,E704,E722,E203