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A mutable mapping data structure which compares using "is".

This is necessary because we have trackable objects (_ListWrapper) which have behavior identical to built-in Python lists (including being unhashable and comparing based on the equality of their contents by default).



D.clear() -> None. Remove all items from D.


D.get(k[,d]) -> D[k] if k in D, else d. d defaults to None.


D.items() -> a set-like object providing a view on D's items


D.keys() -> a set-like object providing a view on D's keys


D.pop(k[,d]) -> v, remove specified key and return the corresponding value. If key is not found, d is returned if given, otherwise KeyError is raised.


D.popitem() -> (k, v), remove and return some (key, value) pair as a 2-tuple; but raise KeyError if D is empty.


D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D


D.update([E, ]**F) -> None. Update D from mapping/iterable E and F. If E present and has a .keys() method, does: for k in E: D[k] = E[k] If E present and lacks .keys() method, does: for (k, v) in E: D[k] = v In either case, this is followed by: for k, v in F.items(): D[k] = v


D.values() -> an object providing a view on D's values



Return self==value.


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