Python Shelving

shelving.py

def add(x, y):
    return x + y

def subtract(x, y):
    return x - y

import shelve

d = shelve.open('shelve_state.dat')

d['add'] = add
d['subtract'] = subtract

func = d['add']
print func(3,5)

func = d['subtract']
print func(5, 1)

d.close