[pickle] Different version of a class

[mlauer at asmoday-atm.rz.uni-frankfurt.de]

Hi,

my application uses pickle to store and load data.

During developing cycle, many variables are added
to the classes which are pickled. Whenever I load
a file pickled with a previous version, some
variables are not existent (naturally, because
__init__ is not called). Is there an easy way
to initialize the "new" variables or must I
call __init__ - which would overwrite some of
my saved variables.

Any idea ?

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