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How to create a dictionary with ordered and read-only items, returning default value with non-existent key, grouping multiple dictionaries into a single map and much more. If you want your dictionary to behave in a particular way that it would take some thoughts to implement? Let’s look at 4 different scenarios when you want to have a specialized implementation, such as: create an ordered dictionary, return default values when there is no requested key, group dictionaries together like a chain. ChainMap allows users to access and change the items within the dictionary.