How do you calculate program run time in python?
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Good idea is this answer (short and quick): stackoverflow.com/a/1557584/3048464Max– Max2015-01-13 14:34:15 +00:00Commented Jan 13, 2015 at 14:34
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5 Answers
Quick alternative
import timeit
start = timeit.default_timer()
#Your statements here
stop = timeit.default_timer()
print('Time: ', stop - start)
3 Comments
diffracteD
@hajder the time it gives is in seconds right ?!
H.Rabiee
@diffracteD yes, UNIX EPOCH. docs.python.org/2/library/timeit.html#timeit.default_timer and epochconverter.com
karzler007
But default_timer() measures wall clock time, hence any other program will interfere with the measurement.
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
2 Comments
Thomas Winckelman
My favorite! Very simple, but I find that the final line should be 'print( datetime.now()-start )' and does not work without the parentheses.
nsane
@ThomasWinckelman: At the time I wrote the answer keeping Python 2 in mind.
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:
1 Comment
Landshark666
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.@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$
