Hi,
I've been pickling some data to store in a datastore blob, and recently I
tried to download and unpickle the data on my local machine. I got errors
whenever I tried to do this because it seems like production uses a
different version of ProtocolBuffers than the SDK.
Part of the pickled data contained an appengine Key, which contains a
reference to a google.appengine.datastore.entity_pb.Reference, which is a
subclass of google.net.proto.ProtocolBuffer.ProtocolMessage. On the SDK,
this is old-style python class. But it looks like its a new-style class on
production. (Of course, I can't see the code, but it hasattr '__new__' and
'__class__').
I'm not sure if this is a bug. It seems like you should be able to pickle
app engine classes, and it would be nice if you could read that data in the
SDK.
This is the exception that I get when trying to unpickle in the dev SDK:
Traceback (most recent call last):
File "<console>", line 1, in <module>
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py",
line 1382, in loads
return Unpickler(file).load()
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py",
line 858, in load
dispatch[key](self)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py",
line 1083, in load_newobj
obj = cls.__new__(cls, *args)
AttributeError: class Reference has no attribute '__new__'
--Alex
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