Applied pep8

graph_drawing @ dd15ea76

-Subproject commit c8ecf7081c6b944228a208617ad539e67091ef78
+Subproject commit dd15ea769014473840174ed8688892bbded82dc2

tests/test_parser.py

@@ -106,7 +106,6 @@ class TestParser(RulesTestCase):
         self.assertEqual(tree('sin (cos x) ^ 2'), sin(cos(x)) ** 2)
         self.assertEqual(tree('sin((cos x) ^ 2)'), sin(cos(x) ** 2))
 
-
     def test_brackets(self):
         self.assertEqual(*tree('[x], x'))
         self.assertEqual(*tree('[x], (x)'))