Python technique

Python technique

flatten [item for sublist in l for item in sublist] http://stackoverflow.com/questions/952914/making-a-flat-list-out-of-list-of-lists-in-python

Nested in an associative array

defaultdict(list) http://stackoverflow.com/questions/10664856/make-dictionary-with-duplicate-keys-in-python

The set of sets is union ()

set().union(*list) http://stackoverflow.com/questions/2151517/pythonic-way-to-create-union-of-all-values-contained-in-multiple-lists

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