If I do this:
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.
How is __m_rw.books defined? If it is a class attribute of the class of __m_rw you will see this behavior. e.g.
>>> class Mrw: ... books = [] ... >>> m=Mrw() >>> class Mrw: ... books = [] ... >>> __m_rw = Mrw() >>> __m_rw.books.append(1) >>> __m_rw.books [1]
but __m_rw.books will not be pickled with __m_rw because it belongs to the class, not the instance.
The fix is to declare books as an instance attribute:
class Mrw:
def __init__(self):
self.books = []Kent
Any clue ?
Thanks
Philippe
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