What are decorators in Python?

Python decorators are just plain functions or other callables which take as single argument the function or class to be decorated. As such you can use many ordinary functions as decorators and vice versa.

def message(param1, param2):
    def wrapper(wrapped):
        class WrappedClass(wrapped):
            def __init__(self):
                self.param1 = param1
                self.param2 = param2
                super(WrappedClass, self).__init__()
 
            def get_message(self):
                return "message %s %s" % (self.param1, self.param2)
 
        return WrappedClass
    return wrapper
 
 
@message("param1", "param2")
class Pizza(object):
    def __init__(self):
        pass
 
 
pizza_with_message = Pizza()
print(pizza_with_message.get_message())

Sample output of above program.

message param1 param2

Python Programming

What are decorators in Python?

Sample output of above program.