[Tutor] time taken to execute certain task

[tee chwee liong]

hi, 
 
i would like to know the time taken to execute a certain task in python. i used 
time.time and time.clock and i see the time taken is different? what is the 
right method to use? 
 
import time
def testtime(num):
    start=time.time()
    #print start
    for n in range(num):
        #print n
        print time.time()-start
      
testtime(101) 

start = time.clock()
for x in range(101):
  y = x  # do something
end = time.clock()
print "Time clock elapsed = ", end - start, "seconds"
 
thanks
tcl
 
                                          
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