The shelve module provides a persistent dictionary
Idea: works like a dictionary, but data is stored on disk
import shelve
d = shelve.open("data") # Open a 'shelf'
d['foo'] = 42 # Save data
x = d['bar'] # Retrieve data
Shelf operations
d[key] = obj # Store an object
obj = d[key] # Retrieve an object
del d[key] # Delete an object
d.has_key(key) # Test for existence of key
d.keys() # Return a list of all keys
d.close() # Close the shelf