diff --git a/tests/common/test_utilites.py b/tests/common/test_utilites.py
index 5c01f67..ea59441 100644
--- a/tests/common/test_utilites.py
+++ b/tests/common/test_utilites.py
@@ -1,4 +1,4 @@
-from common.utilities import bitand, bitor, lshift, rshift, bitnot
+from common.utilities import bitand, bitnot, bitor, lshift, rshift
 
 
 def test_bit_ops():
diff --git a/tests/y_2015/test_2015_day7.py b/tests/y_2015/test_2015_day7.py
index 704dfc0..3c977d3 100644
--- a/tests/y_2015/test_2015_day7.py
+++ b/tests/y_2015/test_2015_day7.py
@@ -30,14 +30,14 @@ def test_calculate_2():
 
 
 def test_Element_resolve():
-    element = Element('123')
+    element = Element("123")
     assert element.resolve({}) == 123
 
-    element = Element('a')
-    assert element.resolve({'a': Element('1')}) == 1
+    element = Element("a")
+    assert element.resolve({"a": Element("1")}) == 1
 
-    element = Element('NOT 1')
+    element = Element("NOT 1")
     assert element.resolve({}) == 65534
 
-    element = Element('a')
-    assert element.resolve({'a': Element('b AND b'), 'b': Element('1')}) == 1
+    element = Element("a")
+    assert element.resolve({"a": Element("b AND b"), "b": Element("1")}) == 1
diff --git a/y_2015/day7.py b/y_2015/day7.py
index b4dd0f7..98320b4 100644
--- a/y_2015/day7.py
+++ b/y_2015/day7.py
@@ -3,10 +3,7 @@
 from pydantic.dataclasses import dataclass
 
 from common.aoc import AoCDay
-
-
-from common.utilities import bitand, bitor, lshift, rshift, bitnot
-
+from common.utilities import bitand, bitnot, bitor, lshift, rshift
 
 OPERATORS: Dict[str, Any] = {
     "NOT": bitnot,