I have a function with a string as an argument that returns two lists
e.g.
def return_words(string):
return list1, list2
Obviously there's code in between. I want to be able to time this function accurately for various strings as I need to improve efficiency when long strings are inputted.
Sorry if this is a trivial question as I am new to python.
Thanks
You can use timeit module and pass the arguments in timeit's setup argument:
from timeit import timeit
inp = """
def return_words(string):
return list1, list2
return_words(string)
"""
for s in list_of_inputs:
print '{}'.format(s), '->', timeit(stmt=inp,
number=1000000,
setup="string = '{}'".format(s))
Demo :
inp = """
def return_words(string):
return [i for i in string if i.isdigit()]
return_words(string)
"""
list_of_inputs = ['inputstring1', 'inp2']
for s in list_of_inputs:
print '{}'.format(s), '->', timeit(stmt=inp,
number=1000000,
setup="string = '{}'".format(s))
Output:
inputstring1 -> 0.986068964005
inp2 -> 0.548749923706
Note that timeit also accepts a function as the first argument which is defined in your code, but you can not pass argument to it. In that case it's better to create a wrapper which will call your function with relative arguments. Read http://pythoncentral.io/time-a-python-function/ for more info.
With Python 3.7, there is a new nanosecond timer:
>>> st={time.time_ns() for e in range(10000000)}
>>> (max(st)-min(st))/10**9
2.275888
So a range counter (and calling time.time_ns() that many times) to 10,000,000 takes 2.275888 seconds...
There is also a nanosecond precision performance timer (how long does the range part take?):
>>> t1=time.perf_counter_ns(); x={y for y in range(10000000)}; t2=time.perf_counter_ns()
>>> (t2-t1)/10**9
0.860256448
Or the timeit module:
>>> timeit.timeit("x={_ for _ in range(10000000)}",number=1)
0.7478707919999579
Another option is to use time and timedelta. You can modify the code below
import time
from datetime import timedelta
start_time = time.time()
//do stuff
end_time = time.time()
time_slice = end_time - start_time
human_time = str(timedelta(seconds=int(time_slice)))
