intersection, union, difference, symmetric difference for dictionaries

mauro mauro at gmail.com
Tue Feb 25 21:32:38 CET 2014


 Dictionaries and sets share a few properties:
- Dictionaries keys are unique as well as sets items
- Dictionaries and sets are both unordered
- Dictionaries and sets are both accessed by key
- Dictionaries and sets are both mutables

So I wonder why operations such us intersection, union, difference, 
symmetric difference that are available for sets and are not available 
for dictionaries without going via key dictviews. 



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