Decorators in Django are a powerful tool for adding additional functionality to your views and functions. They can be used to implement common patterns such as authentication and authorization, caching, and logging.

Here's a step-by-step guide to using decorators in Django:

Create a Decorator Function: The first step is to create a function that takes a view function as an argument and returns a modified version of the view. This function is called a decorator.

def my_decorator(view_func):
    def wrapper(request, *args, **kwargs):
        # code to be executed before the view
        response = view_func(request, *args, **kwargs)
        # code to be executed after the view
        return response
    return wrapper

Apply the Decorator: To apply the decorator to a view, simply add the @ symbol followed by the name of the decorator before the view function definition.

@my_decorator
def my_view(request):
    # code for the view
    return HttpResponse("Hello, World!")

Use Multiple Decorators: You can also apply multiple decorators to a single view by stacking them on top of each other. The decorators will be applied in the order they are listed.

@decorator1
@decorator2
@decorator3
def my_view(request):
    # code for the view
    return HttpResponse("Hello, World!")

Decorating Class-Based Views: To decorate a class-based view, simply apply the decorator to the dispatch method.

class MyView(View):
    @my_decorator
    def dispatch(self, request, *args, **kwargs):
        # code for the view
        return HttpResponse("Hello, World!")

In conclusion, decorators are a powerful tool in Django for adding additional functionality to your views and functions. They can be used to implement common patterns and improve the structure and maintainability of your code.