larry-discuss team mailing list archive

[Keith Goodman <kwgoodman@xxxxxxxxx>]

On Sun, Jan 31, 2010 at 8:01 AM, Keith Goodman <kwgoodman@xxxxxxxxx> wrote:
> I added two new methods: totuples and tolist. And two new functions:
> fromtuples and fromlist.
>
> totuples can be used, for example, to prepare a larry for insertion
> into a database:
>
>        >>> y = larry([[1, 2], [3, 4]], [['a', 'b'], ['c', 'd']])
>        >>> y.totuples()
>        [('a', 'c', 1), ('a', 'd', 2), ('b', 'c', 3), ('b', 'd', 4)]
>
> And from tuples could be used to go in the other direction.

Added todict and fromdict:

        >>> y = larry([[1.0, 2.0], [3.0, 4.0]], [['a', 'b'], ['c', 'd']])
        >>> y.todict()
        {('b', 'c'): 3.0, ('a', 'd'): 2.0, ('a', 'c'): 1.0, ('b', 'd'): 4.0}

This could be used to create a regular numpy array from indices:

    >> data = {(0, 0): 1.0, (0, 1): 2.0, (1, 0): 3.0, (1, 1): 4.0}
    >> la.fromdict(data).A

    array([[ 1.,  2.],
           [ 3.,  4.]])