http://projects.scipy.org/numpy/browser/branches/1.3.x/numpy/lib/recfunctions.py?rev=8229
did you import?
from numpy.lib import recfunctions
recfunctions.append_fields(*your_args) # base, names, data, ...
Seems like everything is working:
Python 2.6.6 (r266:84292, Sep 15 2010, 15:52:39)
[GCC 4.4.5] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> numpy.__version__
'1.3.0'
>>> from numpy.lib.recfunctions import append_fields
>>> append_fields
<function append_fields at 0x9e3e80c>
>>>