diff --git a/apt/minimization/minimizer.py b/apt/minimization/minimizer.py
index 09b7099..2ab55bc 100644
--- a/apt/minimization/minimizer.py
+++ b/apt/minimization/minimizer.py
@@ -1107,4 +1107,4 @@ class GeneralizeToRepresentative(BaseEstimator, MetaEstimatorMixin, TransformerM
                 to_remove.append(feature)
 
         for feature in to_remove:
-            del generalizations['categories'][feature]
\ No newline at end of file
+            del generalizations['categories'][feature]
diff --git a/tests/test_minimizer.py b/tests/test_minimizer.py
index d022b47..be79d27 100644
--- a/tests/test_minimizer.py
+++ b/tests/test_minimizer.py
@@ -213,11 +213,11 @@ def test_minimizer_ncp():
     gen2.transform(dataset=ad1)
     ncp6 = gen2.ncp
 
-    assert(ncp1 <= ncp3)
-    assert(ncp2 != ncp3)
-    assert(ncp3 != ncp4)
-    assert(ncp4 != ncp5)
-    assert(ncp6 == ncp4)
+    assert (ncp1 <= ncp3)
+    assert (ncp2 != ncp3)
+    assert (ncp3 != ncp4)
+    assert (ncp4 != ncp5)
+    assert (ncp6 == ncp4)
 
 
 def test_minimizer_ncp_categorical():
@@ -289,11 +289,11 @@ def test_minimizer_ncp_categorical():
     gen2.transform(dataset=ad1)
     ncp6 = gen2.ncp
 
-    assert(ncp1 <= ncp3)
-    assert(ncp2 != ncp3)
-    assert(ncp3 != ncp4)
-    assert(ncp4 != ncp5)
-    assert(ncp6 == ncp4)
+    assert (ncp1 <= ncp3)
+    assert (ncp2 != ncp3)
+    assert (ncp3 != ncp4)
+    assert (ncp4 != ncp5)
+    assert (ncp6 == ncp4)
 
 
 def test_minimizer_fit_not_transform():