Bobo and Principia (Web Techniques, Feb 1999)

# Basic persistence and object database use

import BoboPOS

class Customer(BoboPOS.Persistent):
    "A persistent class"

    def __init__(self,name):
        self.name=name

    def set_favorite(self,food):
        self.favorite_food=food

# open the object store
db=BoboPOS.PickleDictionary("customers.bbb")

# if amos is not already in the object store
if not db.has_key("amos"):

    # create a Customer instance in the object store
    db["amos"]=Customer("Amos")

    # change an attribute of the persistent object
    db["amos"].set_favorite("spam")

    # commit the change
    get_transaction().commit()

# prints "Amos' favorite food is spam"	
print "Amos' favorite food is", db["amos"].favorite_food