Python timing

[CrazyMonkeyFox]

I have been writing quite a few small python scripts lately, and I am interested in finding out the time it takes for these scripts to execute. I am aware of the time module, but unsure how to implement it, also whether its the most reliable or not.

I include a script that gets the sum of all primes below 2 million here. If I wanted to time it, how would I go about it?


#!/usr/bin/env python

def isprime(n):
for x in range(2, int(n**0.5)+1):
if n % x == 0:
return False
return True

sum = 0

for i in range (3, 2000000, 2):
if isprime(i) == True: sum += i

sum = sum + 2
print sumThanks in advance :)

[pepperphd]

you@computer$ time pythonscript.py

[CrazyMonkeyFox]

you@computer$ time pythonscript.py


I was kind of looking for an in-script way of doing it. I am aware of that method, but thanks anyway.

[unutbu]

Check out the print_timing decorator:

http://www.daniweb.com/code/snippet368.html#

And if you use IPython, you might also like its builtin timeit function:

http://scienceoss.com/test-the-speed-of-your-code-interactively-in-ipython/

[smartbei]

You can use python's basic time functions and create your own.


import time
t1 = time.time()
EXECUTE_FUNC()
print time.time() - t1

Of course, you can stick that in a function, make it execute the function a large number of times, average it out, etc.