could that be a mutable object issue ?

[Philippe C. Martin]

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.

Any clue ?

Thanks


Philippe



--
***************************
Philippe C. Martin
SnakeCard LLC
www.snakecard.com
***************************

 

[Kent Johnson]

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.
... books = []
... ... 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

 

[Philippe C. Martin]

You are correct and I still don't know Python (sigh).

Thanks

Philippe

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.
... books = []
...... 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