[Boost-users] BGL python bindings: pickling broken by graph property attribute change

From: John Reid (j.reid_at_[hidden])
Date: 2007-05-02 04:31:11

Hi,

Sorry to find another bug when I know you're busy. :(

I guess this was broken when the graph property attributes were 
renamed/refactored:

import boost.graph as bgl
import pickle
g = bgl.Graph()
p = g.add_vertex_property( 'prop', 'float' )
pickle.dump( g, open( 'graph.pickle', 'w' ) )
pickle.load( open( 'graph.pickle', 'r' ) )

raises the following error:

    1368
    1369 def load(file):
-> 1370     return Unpickler(file).load()
    1371
    1372 def loads(str):

c:\apps\Python25\lib\pickle.py in load(self)
     856             while 1:
     857                 key = read(1)
--> 858                 dispatch[key](self)
     859         except _Stop, stopinst:
     860             return stopinst.value

c:\apps\Python25\lib\pickle.py in load_build(self)
    1215         setstate = getattr(inst, "__setstate__", None)
    1216         if setstate:
-> 1217             setstate(state)
    1218             return
    1219         slotstate = None

<type 'exceptions.AttributeError'>: 'Graph' object has no attribute 
'vertex_property_map'

John.