static object with type checking, and some slight example usage.

staticobj.py

class StaticObject(object):
    '''
    Class: StaticObject(object)
    Author: Mike "Fuzzy" Partin
    TODO:
    '''
    def __setattr__(self, key, val):
        '''
        Method: StaticObject.__setattr__(key, val)
        Author: Mike "Fuzzy" Partin
        TODO:
        NOTE:
        This only serves to ensure that our object is essentially static
        No new attributes can be added, because checking for a non-existing
        attribute will raise an AttributeError, and break us out to raise
        UnknownAttribute. In addition strict type checking is preformed, no
        deviation will be tolerated.
        '''
        try:
            tmp = object.__getattr__(self, key)
            if type(tmp) == type(val):
                object.__setattr__(self, key, val)
            else:
                raise InvalidArgument, 'Attempt was made to change the type of an attribute. OLD: %s, NEW: %s' % (
                    repr(type(tmp)), repr(type(val)))
        except AttributeError:
            raise UnknownAttribute, 'Attempt was made to set an unknown attribute in a static object.'

class Screen(StaticObject):
    '''
    Class: Screen(StaticObject)
    Author: Mike "Fuzzy" Partin
    TODO:
    '''
    runTime          = 0
    timeStamp        = time.ctime()
    loadAvg          = avgs = open("/proc/loadavg").readline().split()[:3]
    statusMsg        = ''
    currProgress     = 0
    totalProgress    = 0
    output           = []
    __screens        = {}
    __masterQueue    = Queue.Queue()
    __masterLock     = Lock()

    def __setattr__(self, key, val):
        StaticObject.__setattr__(self, key, val)
        self.__queue.put(self)

BTW, UnknownAttribute and InvalidArgument are customized exceptions I have elsewhere in code, those can easily be changed to whatever you like obviously.