price_utils interaction2

In [8]: price_utils.save_to_db(d, "test.db")
Out[8]: 4186

In [9]: d2 = price_utils.load_from_db("VLO", "1995-1-1", "2011-08-24", "test.db")

In [10]: d2[0]
Out[10]: ('VLO', datetime.datetime(1995, 1, 3, 0, 0), 10.57, 10.57, 10.41, 10.49, 480400.0, 1.05)

In [11]: d2[-1]
Out[11]: ('VLO', datetime.datetime(2011, 8, 24, 0, 0), 20.12, 20.56, 19.8, 20.46, 9280400.0, 20.46)