diff --git a/_test/test_bools.py b/_test/test_bools.py
index d6620b3..3ed4085 100644
--- a/_test/test_bools.py
+++ b/_test/test_bools.py
@@ -1,16 +1,17 @@
+import io
+from typing import Any, Dict, List, Text  # NOQA
 
 import pytest
-import io
-import ruyaml  # NOQA
-from .roundtrip import round_trip, dedent
 
+import ruyaml  # NOQA
 from ruyaml import YAML
-from ruyaml.util import load_yaml_guess_indent
-from ruyaml.scalarbool import ScalarBoolean
 from ruyaml.comments import CommentedSeq
-from ruyaml.representer import RoundTripRepresenter, ScalarNode
 from ruyaml.constructor import RoundTripConstructor
-from typing import Text, Any, Dict, List  # NOQA
+from ruyaml.representer import RoundTripRepresenter, ScalarNode
+from ruyaml.scalarbool import ScalarBoolean
+from ruyaml.util import load_yaml_guess_indent
+
+from .roundtrip import dedent, round_trip
 
 
 def round_trip_stabler(
@@ -31,7 +32,6 @@ def round_trip_stabler(
 
 
 class TestStability:
-
     def test_lowercase_boolean(self):
         round_trip(
             """
diff --git a/lib/ruyaml/main.py b/lib/ruyaml/main.py
index fd0a4fb..7cf16a7 100644
--- a/lib/ruyaml/main.py
+++ b/lib/ruyaml/main.py
@@ -243,9 +243,11 @@ def constructor(self):
         # type: () -> Any
         attr = '_' + sys._getframe().f_code.co_name
         if not hasattr(self, attr):
-            cnst = self.Constructor(preserve_quotes=self.preserve_quotes,
-                                    preserve_bools=self.preserve_bools,
-                                    loader=self)
+            cnst = self.Constructor(
+                preserve_quotes=self.preserve_quotes,
+                preserve_bools=self.preserve_bools,
+                loader=self,
+            )
             cnst.allow_duplicate_keys = self.allow_duplicate_keys
             setattr(self, attr, cnst)
         return getattr(self, attr)