What is Python Decorator?
Decorators are a very effective and also valuable device in Python since it permits programmers to modify the behavior of function or course. Decorators permit us to wrap an additional function to extend the behavior of the wrapped function, without completely changing it. But before diving deep right into decorators allow us to comprehend some ideas that will be available in handy in learning the decorators.
Importance of Using Python Decorators
Decorators are used when we want to tweak the functionality or add a feature to an existing function that we don’t have access to or don’t want to change. Also, if we want to add a specific feature to many functions, such as timing or logging, we can write a decorator function and apply it to all of them.
How to Create a Python Decorator
To create a decorator function in Python, I develop an outer function that takes a function as an argument. There is likewise an inner function that wraps around the decorated function.
Below is the syntax for a standard Python decorator:
def my_decorator_func( func):.
def wrapper_func():.
# Do something before the function.
func().
# Do something after the function.
return wrapper_func.
We make use of a decorator by positioning the name of the decorator straight above the function we intend to utilize it on. You prefix the decorator function with an @ icon.
How Decorators Works ?
First, let’s take a look at a decorator in Python. The following is a very basic illustration of what it would look like when we use a decorator.
@my_decorator
def Good Night():
print(‘Good Night’)
In Python, when you define a function, it becomes an object.
The Good Night function is a function object. @my decorator is a function that can use the Good Night object and return a different object to the interpreter. The object returned by the decorator is referred to as hello. It’s essentially the same as if you were writing your own regular function, such as Good Night = decorate (Good Night). After passing the function to Decorate, which it can utilize whatever it require.
Decorating Classes
You can use decorators on classes in two separate forms. The first is pretty similar with what you’ve done with functions: you can decorate a class’s methods. One of the reasons for the development of decorators back in the day was for this reason.
@classmethod, @staticmethod, and @property are some regularly used decorators that are even built-ins in Python. The @classmethod and @staticmethod decorators are also used to specify methods that aren’t focused on a particular instance of a class.
Conclusion
In this article, we learned about What is Decorator in Python ? , how to create a decorator, how Python decorator works , and importance of using python decorators and decorating the classes. Also, we learned that decorator can be reuse in python. You can also visit another blog on how to use python decorators. We hope you found it informative.
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