diff --git a/src/sage/combinat/key_polynomial.py b/src/sage/combinat/key_polynomial.py
index f8386a08478..be4d5aa8c04 100644
--- a/src/sage/combinat/key_polynomial.py
+++ b/src/sage/combinat/key_polynomial.py
@@ -863,4 +863,3 @@ def sorting_word(alpha):
                 w.append(j+1)
                 L[j], L[j + 1] = L[j + 1], L[j]
     return reversed(w), L
-
diff --git a/src/sage/combinat/schubert_polynomial.py b/src/sage/combinat/schubert_polynomial.py
index 566a6901739..7e9164db5de 100644
--- a/src/sage/combinat/schubert_polynomial.py
+++ b/src/sage/combinat/schubert_polynomial.py
@@ -499,4 +499,3 @@ def product_on_basis(self, left, right):
             X[4, 2, 1, 3]
         """
         return symmetrica.mult_schubert_schubert(left, right)
-
diff --git a/src/sage/groups/cactus_group.py b/src/sage/groups/cactus_group.py
index 2a683051597..9a481cc783c 100644
--- a/src/sage/groups/cactus_group.py
+++ b/src/sage/groups/cactus_group.py
@@ -997,4 +997,3 @@ def gens(self):
                     continue
                 gens.append(val)
         return tuple([self(g) for g in gens])
-
diff --git a/src/sage/groups/finitely_presented_named.py b/src/sage/groups/finitely_presented_named.py
index 87af55b77af..248049fadb7 100644
--- a/src/sage/groups/finitely_presented_named.py
+++ b/src/sage/groups/finitely_presented_named.py
@@ -595,4 +595,3 @@ def CactusPresentation(n):
             elt = gens[i] * gens[j] * ~gens[K.index(y)] * ~gens[K.index(x)]
             rls.append(elt)
     return FinitelyPresentedGroup(F, tuple(rls))
-
diff --git a/src/sage/groups/kernel_subgroup.py b/src/sage/groups/kernel_subgroup.py
index 8c959a81b31..024e8f47b3b 100644
--- a/src/sage/groups/kernel_subgroup.py
+++ b/src/sage/groups/kernel_subgroup.py
@@ -223,4 +223,3 @@ def __invert__(self):
                 s[1,2]*s[2,3]*s[1,2]*s[1,3]
             """
             return type(self)(self.parent(), ~self.value)
-
diff --git a/src/sage/groups/misc_gps/misc_groups_catalog.py b/src/sage/groups/misc_gps/misc_groups_catalog.py
index 045c2a22a43..5396677d0b1 100644
--- a/src/sage/groups/misc_gps/misc_groups_catalog.py
+++ b/src/sage/groups/misc_gps/misc_groups_catalog.py
@@ -25,4 +25,3 @@
 from sage.combinat.root_system.reflection_group_real import ReflectionGroup
 from sage.groups.cactus_group import CactusGroup as Cactus
 from sage.groups.cactus_group import PureCactusGroup as PureCactus
-