![]() Among other features, ChainMap objects are coupled to their underlying dictionaries and they handle removing items in an interesting way. We may be okay with this if our code practices duck typing, but we’ll need to inspect the features of ChainMap to be sure. ![]() Does this actually give us a dictionary?Ī ChainMap object is not a dictionary but it is a dictionary-like mapping. Changes to ChainMap objects affect the first dictionary provided and we don’t want user to change so we provided an empty dictionary first. Why is there an empty dictionary before user? The dictionaries are searched in order, so user returns matches before defaults. We ordered our arguments this way to ensure requirement 1 was met. > user =, user, defaults )Ī ChainMap groups dictionaries together into a proxy object (a “view”) lookups query each provided dictionary until a match is found. For concerns about mutability of nested objects, we should look into epcopy. Note: In 5, we’re focused on updates to the dictionary, not contained objects. updates made to context should never alter defaults or user Now, i need to merge these two lists into a dictionary, wherein the elements of list1 will serve as keys and elements of list2 will serve as.defaults and user should not change during the creation of context.the values in defaults and user can be anything.keys in defaults and user may be any valid keys. ![]()
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