Show how trunk ZODB creates unpicklable objects on Py3k.

reproduce.py

from datetime import datetime

from BTrees.OOBTree import OOBTree
import transaction
from ZODB import DB

WORKING = datetime(5375, 12, 31, 23, 59, 59)
FAILING = datetime(5376, 12, 31, 23, 59, 59)
LASTONE = datetime(9999, 12, 31, 23, 59, 59)

def before():

    db = DB('Data.fs')
    conn = db.open()
    root = conn.root()

    tree = root['tree'] = OOBTree()
    tree[WORKING] = 'working'
    tree[FAILING] = 'failing'
    tree[LASTONE] = 'latest'

    transaction.commit()

    conn.close()
    db.close()

def after():

    db = DB('Data.fs')
    conn = db.open()
    root = conn.root()

    tree = root['tree'] 
    
    print(tree[WORKING])
    print(tree[FAILING])
    print(tree[LASTONE])

    conn.close()
    db.close()

if __name__ == '__main__':
    before()
    after()