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Python – Measure time taken by program to execute

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  • Difficulty Level : Easy
  • Last Updated : 13 Jan, 2023
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This article aims to show how to measure the time taken by the program to execute. Calculating time helps to optimize your Python script to perform better. 

Approach #1 : 

A simple solution to it is to use time module to get the current time. The following steps calculate the running time of a program or section of a program.

  • Store the starting time before the first line of the program executes.
  • Store the ending time after the last line of the program executes.
  • Print the difference between start time and end time.

Code #1 : 

Python3




# Code to Measure time taken by program to execute.
import time
 
# store starting time
begin = time.time()
 
# program body starts
 
for i in range(5):
    print("GeeksForGeeks")
# program body ends
 
time.sleep(1)
# store end time
end = time.time()
 
# total time taken
print(f"Total runtime of the program is {end - begin}")

Output

GeeksForGeeks
GeeksForGeeks
GeeksForGeeks
GeeksForGeeks
GeeksForGeeks
Total runtime of the program is 1.0009586811065674

  Approach #2 : Using Timeit module 

Python3




# importing the required module
import timeit
 
# code snippet to be executed only once
mysetup = "from math import sqrt"
 
# code snippet whose execution time is to be measured
mycode = '''
def example():
    mylist = []
    for x in range(100):
        mylist.append(sqrt(x))
'''
 
# timeit statement
print timeit.timeit(setup = mysetup, stmt = mycode, number = 10000)

Output: 

0.00119590759277

 Approach #3 : Using default_timer() method in timeit module 

Python3




import timeit
 
startTime = timeit.default_timer()
 
for _ in range(100):
    statement = "GeeksForGeeks"
 
endTime = timeit.default_timer()
 
print(endTime - startTime)

Output

1.2153992429375648e-05

Approach #4 : Using the datetime module

Python3




import datetime
 
startTime = datetime.datetime.now()
 
for _ in range(1_00_00_000):
    statement = "GeeksForGeeks"
 
endTime = datetime.datetime.now()
 
print(endTime - startTime)

Output

0:00:00.588817

Note: Output may vary depending on the system or server load. To read more about Timeit modulule, refer – Timeit in Python with Examples


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