a_dict = ({"date": {"year": 2011, "month": 2, "day": 2}, "pay": 810, "cons": 174}, )A special problem is the construction of tuples containing 0 or 1 items: the syntax has some extra quirks to accommodate these. Empty tuples are constructed by an empty pair of parentheses; a tuple with one item is constructed by following a value with a comma (it is not sufficient to enclose a single value in parentheses)