PythonMagick: Convert image to gray scale (black & white)

Hello,
I want to use PythonMagick to convert an image to gray scale.  I've read 
the documentation of Magick++ on http://www.imagemagick.org/Magick++ but 
cannot figure out how to access the GrayscaleType or GRAYColorspace 
attributes from Python.  Please help.

Sample code:

import PythonMagick

filename = "test1.png"
img = PythonMagick.Image()
img.read(filename)

img.type = GrayscaleType

#img.quantizeColorSpace(??)
#img.quantize()
#img.channel(PythonMagick.ChannelType.RedChannel ??)

img.write("test2.png")
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This system is: 64bit Ubuntu 9.10.

$ apt-cache show python-pythonmagick
python-pythonmagick - Object-oriented Python interface to ImageMagick
Version: 0.9.1-1ubuntu1
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What is the best and most up2date Python binding to ImageMagick?
<http://www.procoders.net/?p=67#comments>----
ps. I know about PIL but want to use ImageMagick instead.