w3resource

Creating a Python decorator to measure function execution time

Python Decorator: Exercise-2 with Solution

Write a Python program to create a decorator function to measure the execution time of a function.

Sample Solution:

Python Code:

import time

def measure_execution_time(func):
    def wrapper(*args, **kwargs):
        start_time = time.time()
        result = func(*args, **kwargs)
        end_time = time.time()
        execution_time = end_time - start_time
        print(f"Function {func.__name__} took {execution_time:.4f} seconds to execute")
        return result
    return wrapper

# Example usage
@measure_execution_time
def calculate_multiply(numbers):
    tot = 1
    for x in numbers:
        tot *= x
    return tot

# Call the decorated function
result = calculate_multiply([1, 2, 3, 4, 5])
print("Result:", result)

Sample Output:

Function calculate_multiply took 0.0000 seconds to execute
Result: 120

Explanation:

In the above exercise -

  • The execution_time variable is calculated by subtracting start_time from end_time, representing the elapsed time.
  • The execution time is printed to the console, indicating which function was measured and how long it took. This is done using the format string f"Function {func.__name__} took {execution_time:.4f} seconds to execute". The .4f format specifier ensures four decimal places for execution time.
  • Finally, the original function result is returned.

The @execution_time syntax is used to apply the execution_time decorator to the calculate_multiply function. This indicates that it should be decorated with the functionality provided by the execution_time function.

Flowchart:

Flowchart: Python - Creating a Python decorator to measure function execution time.

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Creating a Python decorator to log function arguments and return value.
Next: Creating a Python decorator to convert function return value.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Become a Patron!

Follow us on Facebook and Twitter for latest update.

It will be nice if you may share this link in any developer community or anywhere else, from where other developers may find this content. Thanks.

https://198.211.115.131/python-exercises/decorator/python-decorator-exercise-2.php