1sum_of_elements = sum(<collection>)
2elementwise_sum = [sum(pair) for pair in zip(list_a, list_b)]
3sorted_by_second = sorted(<collection>, key=lambda el: el[1])
4sorted_by_both = sorted(<collection>, key=lambda el: (el[1], el[0]))
5flatter_list = list(itertools.chain.from_iterable(<list>))
6product_of_elems = functools.reduce(lambda out, el: out * el, <collection>)
7list_of_chars = list(<str>)
8