avoid line continuation character

Author: johan12345

lib/matplotlib/lines.py

@@ -1432,8 +1432,8 @@ def __init__(self, xy1, xy2, slope, **kwargs):
 
     def get_transform(self):
         ax = self.axes
-        points_transform = self._transform + ax.transData.inverted()\
-                           + ax.transScale
+        points_transform = (self._transform + ax.transData.inverted() +
+                            ax.transScale)
 
         if self._xy2 is not None:
             # two points were given