Can't use variants

After installing python-chess library with `pip install python-chess` and verifying that I have the latest version 

```
import chess
chess.__version__  # '0.16.2'
```

I see that I can't use variants `board = chess.variant.GiveawayBoard()` results in `'module' object has no attribute 'variant'`. I am on ubuntu, using python 2.7.12 |Anaconda 4.2.0 (64-bit)

Any idea what's wrong here?