ImageMagick Issue

[Sick Monkey]

I have the following:
OS = RedHat
ImagMagick installed.
Python v2.5
---------------------
When I run the following command:
ozdon at SickCodeMonkey david.huggins]# identify -format %w
'/someDIR/images/david.huggins/100_0264.JPG'

I get the following result
2304

--------------------
However, when I try to set this value to a variable, ie
w= os.system("identify -format %w
'/someDIR/images/david.huggins/100_0264.JPG'")
print w

I get
TypeError: argument 1 must be string or read-only buffer, not int

NOTE:  This is coming from a Python Servlet Page.

As always, any input is GREATLY appreciated.

Thanks

Dave
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