What are decorators in Python and how do they affect performance?

What are decorators in Python and how do they affect performance?

Decorators are functions that modify the behavior of another function. They can add functionality, but may impact performance.

Can you give me an example of a decorator?

Sure! Here's a simple example:

def my_decorator(func):
    def wrapper():
        print("Something is happening before the function is called.")
        func()
        print("Something is happening after the function is called.")
    return wrapper

@my_decorator
def say_hello():
    print("Hello!")

How does using a decorator affect the execution time of the function?

Using a decorator adds some overhead due to the additional function calls. However, the impact on performance depends on what the decorator does.

Are there any best practices for using decorators?

Yes, keep decorators simple, avoid heavy computations inside them, and use them only when necessary to minimize performance impact.