Python Decorators

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Python’s decorators are a highly strong and practical tool because they let programmers change the behavior of a function or class. Decorators enable us to wrap another function in order to modify its behavior temporarily while extending the behavior of the wrapped function.

For example, now we have a function called hello()

def hello():
    print('hello')

We wanted to add more function temporarily. Decorators allow us to switch on and off to the additional function.

Now we create another function called hello_decorator()

def hello_decorator(func):
    def wrapper():
        print('Before hello function')
        func()
        print('After hello function')
    return wrapper

The hello_decorator() will return the wrapper(). By passing the hello() as an argument and called inside the hello_decorator().

decorated_hello = hello_decorator(hello)

Now we execute decorated_hello(), it will return

Before hello function
hello
After hello function