Python function producing unexpected output [duplicate]

Question

I have the following python code:

from time import time def program1(a,b): for trial in range(5): start = time() a + b print (time() - start) program1(27,59)

and according to the tutorial should produce this output:

9.53674316406e-07 2.14576721191e-06 2.14576721191e-06 3.09944152832e-06 9.53674316406e-07

Instead it produces:

0.0 0.0 0.0 0.0 0.0 >>>

I am trying to use it demonstrate the concept of time/space complexity.

Can anyone shed any light on the output and why it is not accepting the parameters?

a+b is happening too fast to have any resolution when time() - start is computed. — Rafael Barros
– Rafael Barros, Commented Sep 10, 2021 at 18:58
Can you suggest how I can achieve the output as shown in the tutorial in order to demonstrate this to students, or a better way perhaps that demonstrates — Compoot
– Compoot, Commented Sep 10, 2021 at 18:59
If you want to demonstrate time complexity, do something whose time is dependent on trial — Barmar
– Barmar, Commented Sep 10, 2021 at 19:01

Rafael Barros · Accepted Answer · 2021-09-10 19:11:21Z

Try this:

from time import time, sleep import random def program1(a,b): for trial in range(5): start = time() # gets current time time_to_sleep = random.random() # random() returns a number between 0 and 1 # sleep will block the execution here for the number of seconds passed (0.5 is half a second for instance). sleep(time_to_sleep) print (time() - start) program1(27,59)

I added the random to make it a little bit unpredictable.

Rafael - will try - could you add some comments (for teaching purposes). Explaining what is happening. For instance, what exactly is time() doing (calling what). and the sleep.random

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