I installed [pygr][1] and its prerequisites.

Running:

```
>>> from pygr import worldbase
>>> dir(worldbase)
['0root', '0version']
```

Where it was supposed to return

    ['Bio']

according to the documentation (root and version are empty).

Am I doing something wrong?

By the way, this package is five years old and nothing has been contributed to it since. Which leads me to wonder: is the *worldbase* database still maintained at UCLA?

For the curious, what I want to do next is:

```
hg17 = worldbase.Bio.Seq.Genome.HUMAN.hg17()
chr1 = hg17['chr1']
```

 [1]: https://code.google.com/p/pygr/
My experience is that pygr is not maintained anymore. I actually made https://www.biostars.org/p/93364/ as a pygr-compatible interface. You'll find that it works with more or less the same API as pygr, and if you find something that doesn't work the way you want it please tell me and I'll do my best to add it! To work with hg17, 18, or 19 you can just download a multifasta file and pass it to the `Fasta` class. From there you can do what you're attempting and use the reference like a dictionary.