#!/usr/bin/env python
"""Persistent Modular Storage. Sean B. Palmer. GPL 2"""

import sys, os.path, types, shelve

class Permod(types.ModuleType): 
   def __init__(self, name, fn): 
      types.ModuleType.__init__(self, name, __doc__)
      self.__db = shelve.open(fn)
      for (key, value) in self.__db.iteritems(): 
         setattr(self, key, value)

   def __setattr__(self, attr, item): 
      if not attr.startswith('_'): 
         self.__db[attr] = item
         self.__db.sync()
      object.__setattr__(self, attr, item)

if __name__ != "__main__": 
   fn, ext = os.path.splitext(__file__)
   permod = Permod(__name__, fn + '.data')
   sys.modules[__name__] = permod
else: print __doc__