Querying for Unique Ancestors of models in Google App Engine DS -


anyone have clean ways unique list of ancestors of entities of particular model?

eg if there class a, , class b(parent=a), can 1 find a's have b's

ended doing 1 liner; 

a_with_b = set([b.parent() b in b.all(keys_only=true)]) #list comprehension

fyi, in python 3, 

a_with_b = {b.parent() b in b.all(keys_only=true)} #set comprehension

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