diff --git a/cyaron/query.py b/cyaron/query.py
index 5a93958..2eed967 100644
--- a/cyaron/query.py
+++ b/cyaron/query.py
@@ -70,8 +70,10 @@ def get_one_query(
                 cur_range = position_range[i]
 
             if cur_range[0] > cur_range[1]:
-                raise ValueError("upper-bound should be larger than lower-bound")
-            if mode == RangeQueryRandomMode.less and cur_range[0] == cur_range[1]:
+                raise ValueError(
+                    "upper-bound should be larger than lower-bound")
+            if mode == RangeQueryRandomMode.less and cur_range[0] == cur_range[
+                    1]:
                 raise ValueError(
                     "mode is set to less but upper-bound is equal to lower-bound"
                 )
diff --git a/cyaron/tests/range_query_test.py b/cyaron/tests/range_query_test.py
index 8f91f7d..98db57a 100644
--- a/cyaron/tests/range_query_test.py
+++ b/cyaron/tests/range_query_test.py
@@ -24,6 +24,7 @@ def valid_query(l, r, mode: RangeQueryRandomMode, limits) -> bool:
 
 
 class TestRangeQuery(unittest.TestCase):
+
     def test_allow_equal_v1(self):
         dimension = random.randint(1, 10)
         limits = Vector.random(dimension, [1000])  # n1, n2 ...
@@ -31,8 +32,8 @@ def test_allow_equal_v1(self):
         self.assertEqual(len(Q), 10**5)
         for i in range(10**5):
             self.assertTrue(
-                valid_query(Q[i][0], Q[i][1], RangeQueryRandomMode.allow_equal, limits)
-            )
+                valid_query(Q[i][0], Q[i][1], RangeQueryRandomMode.allow_equal,
+                            limits))
 
     def test_allow_equal_v2_throw(self):
         dimension = random.randint(1, 10)
@@ -46,10 +47,8 @@ def test_allow_equal_v2_throw(self):
             self.assertEqual(len(Q), 10**5)
             for i in range(10**5):
                 self.assertTrue(
-                    valid_query(
-                        Q[i][0], Q[i][1], RangeQueryRandomMode.allow_equal, limits
-                    )
-                )
+                    valid_query(Q[i][0], Q[i][1],
+                                RangeQueryRandomMode.allow_equal, limits))
         except:
             throw = True
 
@@ -65,8 +64,8 @@ def test_allow_equal_v2_no_throw(self):
         self.assertEqual(len(Q), 10**5)
         for i in range(10**5):
             self.assertTrue(
-                valid_query(Q[i][0], Q[i][1], RangeQueryRandomMode.allow_equal, limits)
-            )
+                valid_query(Q[i][0], Q[i][1], RangeQueryRandomMode.allow_equal,
+                            limits))
 
     def test_less_v1(self):
         dimension = random.randint(1, 10)
@@ -75,8 +74,8 @@ def test_less_v1(self):
         self.assertEqual(len(Q), 10**5)
         for i in range(10**5):
             self.assertTrue(
-                valid_query(Q[i][0], Q[i][1], RangeQueryRandomMode.less, limits)
-            )
+                valid_query(Q[i][0], Q[i][1], RangeQueryRandomMode.less,
+                            limits))
 
     def test_less_v2_throw(self):
         dimension = random.randint(1, 10)
@@ -90,8 +89,8 @@ def test_less_v2_throw(self):
             self.assertEqual(len(Q), 10**5)
             for i in range(10**5):
                 self.assertTrue(
-                    valid_query(Q[i][0], Q[i][1], RangeQueryRandomMode.less, limits)
-                )
+                    valid_query(Q[i][0], Q[i][1], RangeQueryRandomMode.less,
+                                limits))
         except:
             throw = True
 
@@ -110,5 +109,5 @@ def test_less_v2_no_throw(self):
         self.assertEqual(len(Q), 10**5)
         for i in range(10**5):
             self.assertTrue(
-                valid_query(Q[i][0], Q[i][1], RangeQueryRandomMode.less, limits)
-            )
+                valid_query(Q[i][0], Q[i][1], RangeQueryRandomMode.less,
+                            limits))