Decorators with parameters in Python are an advanced feature that allow you to pass additional arguments to your decorators, enhancing their flexibility. Here's a practical example to illustrate this concept:

Basic Decorator Structure

First, let's start with a basic decorator structure:

In this example, simple_decorator is a regular decorator that modifies the behavior of the say_hello function.

Decorator with Parameters

Now, let's create a decorator that accepts parameters:

In this example, decorator_with_args is a decorator factory that accepts parameters (arg1, arg2) and returns the actual decorator (decorator). The wrapper function is the one that modifies the behavior of the decorated function (print_numbers).

Explanation

• decorator_with_args is called with its arguments ("hello", 42);
• It returns the decorator function;
• decorator takes a function print_numbers and returns the wrapper function;
• wrapper has access to both the arguments of decorator_with_args and the arguments of print_numbers.

This structure allows for greater flexibility and reusability of decorators, as you can pass custom arguments to modify their behavior.