ContinuumIO/blaze — pull request #270 by mrocklin (2014-05-19 18:42:37+00:00)
Title: Data layer supports streaming access with `.py` getitem

The data layer's .py getitem syntax now returns a lazy sequence if given a slice or list. Also a few minor bugfixes.

```Python
In [1]: from blaze.data import *

In [2]: schema = '{transaction: int, from: int, to: int, date: string, value: real}'

In [3]: dd = CSV('user_edges.txt', schema=schema)

In [4]: dd.py[:, 'transaction']
Out[4]:
```