Added vertical lines connecting whiskers to main box

pygal/graph/box.py

@@ -110,6 +110,16 @@ class Box(Graph):
                           coords=[(left_edge, self.view.y(whisker)), (left_edge + width, self.view.y(whisker))],
                           attrib={'stroke-width': 3})
 
+        # draw lines connecting whiskers to box (Q1 and Q3)
+        self.svg.line(parent_node,
+                      coords=[(left_edge + width / 2, self.view.y(quartiles[0])),
+                              (left_edge + width / 2, self.view.y(quartiles[1]))],
+                      attrib={'stroke-width': 2})
+        self.svg.line(parent_node,
+                      coords=[(left_edge + width / 2, self.view.y(quartiles[4])),
+                              (left_edge + width / 2, self.view.y(quartiles[3]))],
+                      attrib={'stroke-width': 2})
+
         # box, bounded by Q1 and Q3
         self.svg.node(parent_node,
                       tag='rect',