OK, sorry. The hook is elsewhere:
You should provide a __setstate__ method on Tableau (or if you don't
like that, a proxy class that you provide with
register_unpickle_override). Now you have to write __setstate__ in
such a way that it can distinguish between input data for either
Tableau_class or for Tableau and take appropriate action in either
case.
The default unpickling seems to be:
- make a new class instance (but don't run __init__)
- set the instance attribute dictionary to a value obtained from the
pickle.
so if you changed the layout of the attributes that won't work.
When you supply a __setstate__ method you get to decide yourself what
goes into the dictionary (or whatever other actions you want to take).
It should probably look something like:
def __setstate__(self,a):
if <a is a dictionary for Tableau_class>:
self.new_attribute=a['old_attribute']
... and other conversions ...
else:
self.__dict__.update(a)
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