def get_in(d, t, default=None):
    """
    look up if you can get a tuple of values from a nested dictionary,
    each item in the tuple a deeper layer

    example: get_in({1: {2: 3}}, (1, 2)) -> 3
    example: get_in({1: {2: 3}}, (2, 3)) -> {}
    """
    result = reduce(lambda d, t: d.get(t, {}), t, d)
    if not result:
        return default
    else:
        return result
look up if you can get a tuple of values from a nested dictionary,
    each item in the tuple a deeper layer

    example: get_in({1: {2: 3}}, (1, 2)) -> 3
    example: get_in({1: {2: 3}}, (2, 3)) -> {}