I am new to python so this may sound very basic. I have imported a csv file using csv2rec. The first row has headers. I want to change the headers to 'x', 'y', 'z'. What's the best way of doing this?

>>> import matplotlib
>>> import matplotlib.mlab as mlab
>>> r= mlab.csv2rec('HeightWeight.csv', delimiter= ',')
>>> names= r.dtype.names
>>> for i in names:
     print i


index
heightinches
weightpounds
python numpy matplotlib
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