What is Decorators in Python?
A decorator in Python in any callable Python object that is used to modify a function or a class. It takes in a function, adds some functionality, and returns it.
Decorators are a very powerful and useful tool in Python since it allows programmers to modify/control the behavior of function or class. Decorators are usually called before the definition of a function you want to decorate.
There are two different kinds of decorators in Python:
- Function decorators
- Class decorators
def test_decorator(func): def function_wrapper(x): print("Before calling " + func.__name__) res = func(x) print(res) print("After calling " + func.__name__) return function_wrapper @test_decorator def sqr(n): return n ** 2 sqr(54)
Before calling sqr 2916 After calling sqr