Guido van Rossum added the comment:
The issue seems to be the line
inst_dict = inst.__dict__
in _Unpickler.load_build(). (I found this out by forcing
sys.modules['_pickle'] = None, so the pure-Python pickle.py code gets used.)
This leads to a simpler repro:
# Use the same class definitions for A and B
b = B("hello")
print(b.__dict__) # Same error message as before
That is, specialized subclasses of generics don't have a working __dict__
attribute! Interestingly, A("hello").__dict__ works.
I have to ponder this more.
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<http://bugs.python.org/issue25472>
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