import shelve
db = shelve.open('persondb')               # Reopen shelf with same filename

for key in sorted(db):                     # Iterate to display database objects
    print(key, '\t=>', db[key])            # Prints with custom format

sue = db['Sue Jones']                      # Index by key to fetch
sue.giveRaise(.10)                         # Update in memory using class's method
db['Sue Jones'] = sue                      # Assign to key to update in shelf
db.close()                                 # Close after making changes