xyz = point was correct in last version

tfields/bounding_box.py

-import tfields
-import numpy as np
-import matplotlib.pyplot as plt
-import sympy
 import copy
 import logging
+import numpy as np
+import sympy
+import tfields
 
 
 class Node(object):
     """
-    This class allows to increase the performance with cuts in x,y and z direction
+    This class allows to increase the performance with cuts in
+    x,y and z direction
     An extension to arbitrary cuts might be possible in the future
 
     Args:
@@ -22,7 +22,7 @@ class Node(object):
         >>> mesh = tfields.Mesh3D.grid((5.6, 6.2, 3),
         ...                            (-0.25, 0.25, 4),
         ...                            (-1, 1, 10))
-        
+
         >>> cuts = {'x': [5.7, 6.1],
         ...         'y': [-0.2, 0, 0.2],
         ...         'z': [-0.5, 0.5]}