How do you calculate program run time in python?

Question

Good idea is this answer (short and quick): http://stackoverflow.com/a/1557584/3048464 — Max, Jan 13 '15 at 14:34

score 346 · Answer 1 · edited Aug 15 '18 at 01:06

346

Quick alternative

import timeit

start = timeit.default_timer()

#Your statements here

stop = timeit.default_timer()

print('Time: ', stop - start)

edited Aug 15 '18 at 01:06

Tanya Branagan

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answered May 07 '13 at 08:04

H.Rabiee

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@hajder the time it gives is in seconds right ?! – diffracteD Mar 14 '14 at 11:22
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@diffracteD yes, UNIX EPOCH. http://docs.python.org/2/library/timeit.html#timeit.default_timer and http://www.epochconverter.com/ – H.Rabiee Mar 14 '14 at 17:48
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But default_timer() measures wall clock time, hence any other program will interfere with the measurement. – karzler007 Feb 23 '16 at 14:09

score 67 · Answer 2 · answered Jan 07 '14 at 14:41

67

I don't know if this is a faster alternative, but I have another solution -

from datetime import datetime
start=datetime.now()

#Statements

print datetime.now()-start

answered Jan 07 '14 at 14:41

nsane

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My favorite! Very simple, but I find that the final line should be 'print( datetime.now()-start )' and does not work without the parentheses. – Thomas Winckelman Jan 15 '20 at 02:08
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@ThomasWinckelman: At the time I wrote the answer keeping Python 2 in mind. – nsane Jan 15 '20 at 04:09

JoshAdel · Accepted Answer · 2011-04-11T14:50:42.247

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You might want to take a look at the timeit module:

http://docs.python.org/library/timeit.html

or the profile module:

http://docs.python.org/library/profile.html

There are some additionally some nice tutorials here:

http://www.doughellmann.com/PyMOTW/profile/index.html

http://www.doughellmann.com/PyMOTW/timeit/index.html

And the time module also might come in handy, although I prefer the later two recommendations for benchmarking and profiling code performance:

http://docs.python.org/library/time.html

edited Apr 11 '11 at 14:50

answered Apr 11 '11 at 14:45

JoshAdel

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Thanks! This worked great. One note for others who may be using timeit for the first time, you will need to import locally defined symbols via timeit's setup parameter. For example (if myOwnFunc was locally defined and what you wanted to time): `print timeit.timeit('myOwnFunc()', setup='from __main__ import myOwnFunc', number=1)`. Without the setup parameter, it will complain that it could not find myOwnFunc. – Landshark666 Dec 24 '12 at 04:13

score 6 · Answer 4 · answered Apr 11 '11 at 15:05

@JoshAdel covered a lot of it, but if you just want to time the execution of an entire script, you can run it under time on a unix-like system.

kotai:~ chmullig$ cat sleep.py 
import time

print "presleep"
time.sleep(10)
print "post sleep"
kotai:~ chmullig$ python sleep.py 
presleep
post sleep
kotai:~ chmullig$ time python sleep.py 
presleep
post sleep

real    0m10.035s
user    0m0.017s
sys 0m0.016s
kotai:~ chmullig$

score 4 · Answer 5 · edited May 23 '17 at 11:55

4

see this: Python - time.clock() vs. time.time() - accuracy?

edited May 23 '17 at 11:55

Community

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answered Apr 11 '11 at 14:46

anta40

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How do you calculate program run time in python?

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