Solve #309 with flake8 constrain

pygal/graph/line.py

@@ -99,12 +99,9 @@ class Line(Graph):
             for i, (x, y) in enumerate(view_values):
                 if None in (x, y):
                     continue
-                    
-                #modified
                 if self.logarithmic:
-                    if points[i][1] == None or points[i][1] <= 0:
+                    if points[i][1] is None or points[i][1] <= 0:
                         continue
-                    
                 if (serie.show_only_major_dots and
                         self.x_labels and i < len(self.x_labels) and
                         self.x_labels[i] not in self._x_labels_major):
@@ -170,14 +167,12 @@ class Line(Graph):
             else:
                 # plain vanilla rendering
                 sequences = [view_values]
-
-			#modified
 			if self.logarithmic:
                 for seq in sequences:
                     for ele in seq[::-1]:
-                        if points[seq.index(ele)][1]==None or points[seq.index(ele)][1] <= 0:
+                    	y = points[seq.index(ele)][1]
+                        if y is None or y <= 0:
                             del seq[seq.index(ele)]			
-			
             for seq in sequences:
                 self.svg.line(
                     serie_node['plot'], seq, close=self._self_close,

pygal/test/test_line_log_none_max_solved.py

@@ -8,8 +8,8 @@ from pygal import Line
 from pygal.test.utils import texts
 from math import cos, sin
 
-chart = Line(title='test', x_label_rotation=90, human_readable=True, logarithmic=True)
-chart.add('test 1', [None, None, None, None, -38, 48, None, 4422, 34443, 345586, 40003452, 1235533, 2235533])
-chart.add('test 2', [ 1, 7, 19, 30, 40, 20, 38, 283, 2937, 29374, 20399, 293874, 3947])
+chart = Line(title='test', logarithmic=True)
+chart.add('test 1', [None, -38, 48, 4422, 35586, 1003452, 225533])
+chart.add('test 2', [1, 40, 20, 38, 2937, 20399, 3947])
 q = chart.render_pyquery()
 assert len(q(".dots")) == 20