134     def __getitem__(self, key):  argument
143     def __delitem__(self, key):  argument
153     def __contains__(self, key):  argument
165     def __setitem__(self, key, value):  argument
195     def get(self, key, default=None):  argument
262     def pop(self, key, *args):  argument
277     def setdefault(self, key, default=None):  argument
336     def __new__(type, ob, callback, key):  argument
341     def __init__(self, ob, callback, key):  argument
391     def __delitem__(self, key):  argument
395     def __getitem__(self, key):  argument
408     def __setitem__(self, key, value):  argument
432     def get(self, key, default=None):  argument
435     def __contains__(self, key):  argument
484     def pop(self, key, *args):  argument
488     def setdefault(self, key, default=None):  argument