You can subclass the ABC (abstract base class) collections.Mapping
(or collections.MutableMapping
if you also want to allow code using your instances to alter the simulated/wrapped dictionary, e.g. by indexed assignment, pop
, etc).
If you do so, then, as the docs I pointed to imply somewhat indirectly, the methods you need to implement are
__len__
__iter__
__getitem__
(for a Mapping
) -- you should also implement
__contains__
because by delegating to the dict you're wrapping it can be done much faster than the iterating approach the ABC would have to apply otherwise.
If you need to supply a MutableMapping
then you also need to implement 2 more methods:
__setitem__
__delitem__
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