Datastructures

[enryH]

The python introduction (notebooks prefixed with 1_) does not introduce dictionaries (dicts), tuples or sets. It introduces the list type extensively. As both pandas and scikit-learn at least partly use or return dicts (and one exercise of numpy gets easier with dicts), I would suggest to add a brief, final notebook in the intro part introducting dicts.

The list.ipynb could be complemented with a distinction between lists and tuples.