Timeit module -passing arguments to python timeit module

Question

from python timeit module i want to check how much time does it take to print the following , how to do so,

import timeit
x = [x for x in range(10000)]
timeit.timeit("print x[9999]")
d=[{i:i} for i in x]
timeit.timeit("print d[9999]")

NameError: global name 'x' is not defined
NameError: global name 'd' is not defined

unrelated: you could also use the command-line interface: python -mtimeit -s'x = list(range(10000)); d = [{i:i} for i in x]' 'd[9999]' — jfs
– jfs, Commented Feb 16, 2015 at 23:53

jonrsharpe · Accepted Answer · 2015-02-16 08:47:14Z

4

Per the docs:

To give the timeit module access to functions you define, you can pass a setup parameter which contains an import statement

In your case, that would be e.g.:

timeit.timeit('print d[9999]', 
              setup='from __main__ import d')

answered Feb 16, 2015 at 8:47

jonrsharpe

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jonrsharpe Over a year ago

Not infinite, but timeit runs 1,000,000 times by default. Did you read the documentation at all?!

Vlad Bezden · Accepted Answer · 2019-01-21 15:10:37Z

2

Here is an example of how you can do it:

import timeit

x = [x for x in range(10000)]
d = [{i: i} for i in x]

for i in [x, d]:
    t = timeit.timeit(stmt="print(i[9999])", number=100, globals=globals())
    print(f"took: {t:.4f}")

Output:

took: 0.0776
took: 0.0788

Please notice I added number=100, so it runs 100 times each test. By default it 1,000,000 times.

answered Jan 21, 2019 at 15:10

Vlad Bezden

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