Source: 📖 Python Cookbook ch14.13 p589

Timing a function call with timetit()

The timeit module can be imported to time a function call. It takes three arguments—the first is a string containing the function you wish to time (with arguments included), the second is another string that runs before the function call to prepare the environment (import statements go here) and the third argument is the number of times the function should be run, which default to one million.

from timeit import timeit

timeit('math.sqrt(4)', 'import math', number=1000000)