[Tutor] How to print corresponding keys in Dictionary

[bob gailer]

Another approach is to subclass dict such that each time you add a 
key:value pair you also create an entry in a reverse dictionary. Then 
all you need do is lookup in the reverse dictionary.

If there are several keys with the same value, then create and extend a 
list of values in the reverse dictionary.

This will fail (as any other reverse dictionary approach will)  if the 
values are not hashable

-- 
Bob Gailer
919-636-4239
Chapel Hill NC