diff --git a/more_executors/_impl/futures/zip.py b/more_executors/_impl/futures/zip.py
index a4e35711..320163ec 100644
--- a/more_executors/_impl/futures/zip.py
+++ b/more_executors/_impl/futures/zip.py
@@ -41,7 +41,7 @@ def __init__(self, fs):
         self.lock = Lock()
         self.count_remaining = len(self.fs)
 
-        for (idx, future) in enumerate(self.fs):
+        for idx, future in enumerate(self.fs):
             chain_cancel(self.out, future)
             future.add_done_callback(weak_callback(partial(self.handle_done, idx)))
 
diff --git a/tests/retry/test_retry.py b/tests/retry/test_retry.py
index fd4f0851..6de0664c 100644
--- a/tests/retry/test_retry.py
+++ b/tests/retry/test_retry.py
@@ -87,7 +87,6 @@ def do_test_basic_retry(executor):
 
 
 def test_fail(executor):
-
     calls = []
 
     def fn():
@@ -113,7 +112,6 @@ def fn():
 
 
 def test_cancel_delegate():
-
     queue = Queue(1)
 
     def null_submit(*args, **kwargs):