human
Complete this python program:
def _dict_decorators():
assistant
#Here is the Python code you requested.

    """Tailored instrumentation wrappers for any dict-like mapping class.
    """
    def _tidy(fn):
        fn._sa_instrumented = True
        fn.__doc__ = getattr(dict, fn.__name__).__doc__
    Unspecified = util.symbol('Unspecified')
    def __setitem__(fn):
        def __setitem__(self, key, value, _sa_initiator=None):
            if (key in self):
                __del(self, self[key], _sa_initiator)
            value = __set(self, value, _sa_initiator)
            fn(self, key, value)
        _tidy(__setitem__)
        return __setitem__
    def __delitem__(fn):
        def __delitem__(self, key, _sa_initiator=None):
            if (key in self):
                __del(self, self[key], _sa_initiator)
            fn(self, key)
        _tidy(__delitem__)
        return __delitem__
    def clear(fn):
        def clear(self):
            for key in self:
                __del(self, self[key])
            fn(self)
        _tidy(clear)
        return clear
    def pop(fn):
        def pop(self, key, default=Unspecified):
            if (key in self):
                __del(self, self[key])
            if (default is Unspecified):
                return fn(self, key)
            else:
                return fn(self, key, default)
        _tidy(pop)
        return pop
    def popitem(fn):
        def popitem(self):
            __before_delete(self)
            item = fn(self)
            __del(self, item[1])
            return item
        _tidy(popitem)
        return popitem
    def setdefault(fn):
        def setdefault(self, key, default=None):
            if (key not in self):
                self.__setitem__(key, default)
                return default
            else:
                return self.__getitem__(key)
        _tidy(setdefault)
        return setdefault
    def update(fn):
        def update(self, __other=Unspecified, **kw):
            if (__other is not Unspecified):
                if hasattr(__other, 'keys'):
                    for key in list(__other):
                        if ((key not in self) or (self[key] is not __other[key])):
                           ...