How to use time.clock() function in python

[yinglcs at gmail.com]

Hi,

I am following this python example trying to time how long does an
operation takes, like this:

My question is why the content of the file (dataFile) is just '0.0'?
I have tried "print >>dataFile, timeTaken" or "print >>dataFile,str(
timeTaken)", but gives me 0.0.
Please tell me what am I missing?


        t1 = time.clock()
        os.system(cmd)

        outputFile = str(i) + ".png"

        t2 = time.clock()

        timeTaken = t2 - t1
        allTimeTaken += timeTaken
        print >>dataFile, timeTaken