Demo: a object that, after close, is in an invalid state. At this point, any method invocation will result in an exception. Output: http://codepad.org/34k4e7wB

closed_object.py

class Foo(object):
    def __invalid_action(self, *args, **kwargs):
        raise IOError('Sorry, we are closed')

    def __init__(self):
        print 'create'

    def read(self):
        print 'read'

    def close(self):
        print 'close'
        print '---'
        for attr in dir(self):
            if attr.startswith('_'):
                continue
            obj = getattr(self, attr)
            if not callable(obj):
                continue
            setattr(self, attr, self.__invalid_action)


f = Foo()
f.read()
f.close()
f.read()

# Output: http://codepad.org/34k4e7wB