I can't figure out how I am doing this wrong:
```
from graph_tool.all import *
graph = collection.data['polbooks']
a = graph.vp['value']
print a
a.get_2d_array([0])
```
I get this trace:
```
<PropertyMap object with key type 'Vertex' and value type 'string',
for Graph 0x7fd6f9440f90, at 0x7fd6f37322d0>
---------------------------------------------------------------------------
IndexError Traceback (most recent call last)
<ipython-input-122-19dc354c8941> in <module>()
2 a = graph.vp['value']
3 print a
----> 4 a.get_2d_array([0])
/home/joelmo/.nix-profile/lib/python2.7/site-packages/graph_tool/__init__.pyc
in get_2d_array(self, pos)
663 for v in iters:
664 for i in range(len(p)):
--> 665 a[i][int(v)] = p[i][v]
666 if len(a) == 1:
667 a = a[0]
IndexError: list assignment index out of range
```
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