刪除包含在Python中的兩個字典中的類對象實例

Question

我正在尋找一種方便的方法來刪除包含在兩個字典中的類對象的實例。當我從一個字典刪除對象實例時，我應該在第二個字典中自動刪除。這無論如何可能嗎？

class node(): 

    def __init__(self, vID): 
     self.vID = vID 

    def __hash__(self): 
     return hash(self.vID) 

    def __eq__(self, other): 
     return self.vID == other.vID 

class structure(): 

    def __init__(self): 
     self.point_index_a = {} 
     self.point_index_b = {} 

    def add_point(self,x,y): 

     x_object = node(x) 
     self.point_index_a[x_object] = None 
     self.point_index_b[x_object] = None 

    def a_iter(self): 

     for k,v in self.point_index_a.iteritems(): 
      print k,v  

    def b_iter(self): 

     for k,v in self.point_index_b.iteritems(): 
      print k,v 

mg = structure() 
mg.add_point(1, 8) 
mg.add_point(3, 4) 

# point index a 
for k,v in mg.point_index_a.iteritems(): 
    print k,v 
# point index b 
for k,v in mg.point_index_b.iteritems(): 
    print k,v 

to_del = mg.point_index_a.iterkeys().next() 
del to_del 

# point index a, object to_del still exists in both dicts 
for k,v in mg.point_index_a.iteritems(): 
    print k,v 
# point index b 
for k,v in mg.point_index_b.iteritems(): 
    print k,v 

Answer 1

我將實現如下：

class structure(): 

    ... 

    def remove(self, point): 
     del self.point_index_a[point] 
     del self.point_index_b[point]