portfolio_utils interaction

In [2]: pwd
Out[2]: u'/Users/travis/git/experimental/portfolio_metrics'

In [3]: import price_utils
In [4]: d = price_utils.get_yahoo_prices(symbol="VLO", startdate="1995-1-1", enddate="2011-08-24")

In [5]: d.dtype
Out[5]: dtype([('symbol', '|S8'), ('date', ('<M8[us]', {})), ('open', '<f8'), ('high', '<f8'), ('low', '<f8'), ('close', '<f8'), ('volume', '<f8'), ('adj_close', '<f8')])

In [6]: len(d)
Out[6]: 4186

In [7]: d[0]
Out[7]: ('VLO', datetime.datetime(2011, 8, 24, 0, 0), 20.12, 20.56, 19.8, 20.46, 9280400.0, 20.46)