could that be a mutable object issue ?

[Fredrik Lundh]

Philippe C. Martin wrote:

> print 'LEN OF BOOK BEFORE APPEND: ', len(pickle.dumps(self.__m_rw))
> self.__m_rw.books.append( [p_col1,p_col2,p_col3] )
> print 'LEN OF BOOK AFTER APPEND: ', len(pickle.dumps(self.__m_rw))
>
> I get the same length before and after append.
>
> when I print self.__m_rw.books, I see my 'appends' in there, yet the
> pickled object does not change.

instead of checking the length, have you checked what

    pickle.loads(pickle.dumps(self.__m_rw))

returns?

</F>