diff --git a/unitary/examples/quantum_chinese_chess/enums.py b/unitary/examples/quantum_chinese_chess/enums.py
index 83e3b63d..3009a0b5 100644
--- a/unitary/examples/quantum_chinese_chess/enums.py
+++ b/unitary/examples/quantum_chinese_chess/enums.py
@@ -54,20 +54,21 @@ class Color(enum.Enum):
 
 
 class Type(enum.Enum):
-    """ The four values are symbols corresponding to
-            English red
-            English black
-            Chinese red
-            Chinese black
-    """    
-    EMPTY    = [".", ".", ".", "."]
-    SOLDIER  = ["s", "S", "兵", "卒"]
-    CANNON   = ["c", "C", "炮", "砲"]
-    ROOK     = ["r", "R", "车", "車"]
-    HORSE    = ["h", "H", "马", "馬"]
+    """The four values are symbols corresponding to
+    English red
+    English black
+    Chinese red
+    Chinese black
+    """
+
+    EMPTY = [".", ".", ".", "."]
+    SOLDIER = ["s", "S", "兵", "卒"]
+    CANNON = ["c", "C", "炮", "砲"]
+    ROOK = ["r", "R", "车", "車"]
+    HORSE = ["h", "H", "马", "馬"]
     ELEPHANT = ["e", "E", "象", "相"]
-    ADVISOR  = ["a", "A", "士", "仕"]
-    GENERAL  = ["g", "G", "将", "帥"]
+    ADVISOR = ["a", "A", "士", "仕"]
+    GENERAL = ["g", "G", "将", "帥"]
 
     @staticmethod
     def type_of(c: str) -> Optional["Type"]:
diff --git a/unitary/examples/quantum_chinese_chess/piece.py b/unitary/examples/quantum_chinese_chess/piece.py
index 62777fcf..0e9462d4 100644
--- a/unitary/examples/quantum_chinese_chess/piece.py
+++ b/unitary/examples/quantum_chinese_chess/piece.py
@@ -11,14 +11,12 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from unitary.alpha import (
-    QuantumObject
-)
+from unitary.alpha import QuantumObject
 from unitary.examples.quantum_chinese_chess.enums import (
     SquareState,
     Language,
     Color,
-    Type
+    Type,
 )
 
 
diff --git a/unitary/examples/quantum_chinese_chess/piece_test.py b/unitary/examples/quantum_chinese_chess/piece_test.py
index 2dfdf327..c7df0358 100644
--- a/unitary/examples/quantum_chinese_chess/piece_test.py
+++ b/unitary/examples/quantum_chinese_chess/piece_test.py
@@ -16,7 +16,7 @@
     SquareState,
     Language,
     Color,
-    Type
+    Type,
 )
 from unitary.examples.quantum_chinese_chess.piece import Piece
 from unitary.alpha import QuantumWorld
@@ -44,4 +44,6 @@ def test_enum():
     p1 = Piece("b1", SquareState.OCCUPIED, Type.HORSE, Color.BLACK)
     p2 = Piece("c2", SquareState.EMPTY, Type.EMPTY, Color.NA)
     board = QuantumWorld([p0, p1, p2])
-    assert board.peek() == [[SquareState.OCCUPIED,SquareState.OCCUPIED,SquareState.EMPTY]]
+    assert board.peek() == [
+        [SquareState.OCCUPIED, SquareState.OCCUPIED, SquareState.EMPTY]
+    ]