1 files changed, 13 insertions, 9 deletions
diff --git a/docs/examples/tutorial/cdef_classes/sin_of_square.pyx b/docs/examples/tutorial/cdef_classes/sin_of_square.pyx
index 7aab96056..67af294b5 100644
--- a/docs/examples/tutorial/cdef_classes/sin_of_square.pyx
+++ b/docs/examples/tutorial/cdef_classes/sin_of_square.pyx
@@ -1,9 +1,13 @@
-from libc.math cimport sin
-
-cdef class Function:
-    cpdef double evaluate(self, double x) except *:
-        return 0
-
-cdef class SinOfSquareFunction(Function):
-    cpdef double evaluate(self, double x) except *:
-        return sin(x ** 2)
+from libc.math cimport sin
+
+
+cdef class Function:
+
+    cpdef double evaluate(self, double x) except *:
+        return 0
+
+
+cdef class SinOfSquareFunction(Function):
+
+    cpdef double evaluate(self, double x) except *:
+        return sin(x ** 2)