python3-mergedict 1.0.0-3 (amd64 binary) in ubuntu oracular

 A MergeDict is a dict with a merge() method. merge() is like
 dict.update(), but it can be subclassed to create custom
 "merge" operations based on the type of an item value.
 .
 Themergedict module comes with a ConfigDict that will
 extend/update lists/sets/dicts.