diff --git a/src/pyGroupedTransforms/GroupedTransform.py b/src/pyGroupedTransforms/GroupedTransform.py
index c083a84..128114e 100644
--- a/src/pyGroupedTransforms/GroupedTransform.py
+++ b/src/pyGroupedTransforms/GroupedTransform.py
@@ -433,7 +433,9 @@ def get_matrix(self):
                 u1 = (0,)
             else:
                 u1 = s1.u
-            F_direct = s1.mode.get_matrix(s1.bandwidths, self.X[:, u1].T, bases=s1.bases)
+            F_direct = s1.mode.get_matrix(
+                s1.bandwidths, self.X[:, u1].T, bases=s1.bases
+            )
             for idx, s in enumerate(self.settings):
                 if idx == 0:
                     continue
diff --git a/src/pyGroupedTransforms/__init__.py b/src/pyGroupedTransforms/__init__.py
index 023e8af..1327bbb 100644
--- a/src/pyGroupedTransforms/__init__.py
+++ b/src/pyGroupedTransforms/__init__.py
@@ -15,7 +15,8 @@
 # import modules
 from .cardinal_bspline import *
 from .DeferredLinearOperator import *
-from .GroupedCoefficients import *  # NFFTtools, NFCTtools, NFMTtools and CWWTtools are imported with GroupedCoefficients
+from .GroupedCoefficients import \
+    *  # NFFTtools, NFCTtools, NFMTtools and CWWTtools are imported with GroupedCoefficients
 from .GroupedTransform import *
 from .GroupedTransforms import *