1 files changed, 19 insertions, 13 deletions
diff --git a/docs/examples/userguide/language_basics/optional_subclassing.pyx b/docs/examples/userguide/language_basics/optional_subclassing.pyx
index f655cadf3..b2a3d4dec 100644
--- a/docs/examples/userguide/language_basics/optional_subclassing.pyx
+++ b/docs/examples/userguide/language_basics/optional_subclassing.pyx
@@ -1,13 +1,19 @@
-from __future__ import print_function
-
-cdef class A:
-    cdef foo(self):
-        print("A")
-
-cdef class B(A):
-    cdef foo(self, x=None):
-        print("B", x)
-
-cdef class C(B):
-    cpdef foo(self, x=True, int k=3):
-        print("C", x, k)
+from __future__ import print_function
+
+
+cdef class A:
+
+    cdef foo(self):
+        print("A")
+
+
+cdef class B(A):
+
+    cdef foo(self, x=None):
+        print("B", x)
+
+
+cdef class C(B):
+
+    cpdef foo(self, x=True, int k=3):
+        print("C", x, k)