import sqlite3, os
def serializable(cls):
  class Wrapper(object):
    SITE_ROOT = os.path.dirname(os.path.realpath(__file__))
    DB_PATH = os.path.join(SITE_ROOT, 'db.sqlite')
    
    def serialize(self):
      conn = sqlite3.connect(self.DB_PATH)
      cursor = conn.cursor()
      for attr in self.instance.TOBD:
	cursor.execute('INSERT INTO store VALUES (?,?,?)', [attr, str(getattr(self.instance,attr)), str(self.wrapped)])
	
      conn.commit()
      cursor.close()
    
    def __init__(self):
      if not hasattr(cls, 'TOBD'):
	cls.TOBD=[]
      setattr(cls, 'serialize', self.serialize)
      self.wrapped=cls
      
    def __call__(self, *args, **kw):
      self.instance=self.wrapped(*args, **kw)
      return self.instance
  return Wrapper()
  
@serializable      
class  Foo():
  TOBD=['a','b']
  def __init__(self):
    self.a=5
    self.b=[1,2,3]
    
f=Foo()
f.serialize()
b=Foo()
b.a="sdfsdf"
b.serialize()