fix minor styling issue

benchmarks/test_basic_doc_ops.py

@@ -135,6 +135,7 @@ def test_big_doc():
         % (timeit(create_and_delete_company, 10) * 10 ** 3)
     )
 
+
 if __name__ == "__main__":
     test_basic()
     print("-" * 100)

mongoengine/base/datastructures.py

@@ -426,7 +426,7 @@ class StrictDict(object):
         return listitems(self) == listitems(other)
 
     def __ne__(self, other):
-        return not(self == other)
+        return not (self == other)
 
     @classmethod
     def create(cls, allowed_keys):

setup.py

@@ -143,7 +143,7 @@ setup(
     long_description=LONG_DESCRIPTION,
     platforms=["any"],
     classifiers=CLASSIFIERS,
-    install_requires=['pymongo>=3.4', 'six', 'future'],
+    install_requires=["pymongo>=3.4", "six", "future"],
     cmdclass={"test": PyTest},
     **extra_opts
 )

tests/fields/test_sequence_field.py

@@ -267,8 +267,8 @@ class TestSequenceField(MongoDBTestCase):
         foo = Foo(name="Foo")
         foo.save()
 
-        assert (
-            "base.counter" not in self.db["mongoengine.counters"].find().distinct("_id")
+        assert "base.counter" not in self.db["mongoengine.counters"].find().distinct(
+            "_id"
         )
         existing_counters = self.db["mongoengine.counters"].find().distinct("_id")
         assert "foo.counter" in existing_counters

tests/test_signals.py

@@ -58,7 +58,9 @@ class TestSignal(unittest.TestCase):
 
             @classmethod
             def post_save(cls, sender, document, **kwargs):
-                dirty_keys = list(document._delta()[0].keys()) + list(document._delta()[1].keys())
+                dirty_keys = list(document._delta()[0].keys()) + list(
+                    document._delta()[1].keys()
+                )
                 signal_output.append("post_save signal, %s" % document)
                 signal_output.append("post_save dirty keys, %s" % dirty_keys)
                 if kwargs.pop("created", False):