Explain decorators in python

Decorator :

• Decorator is the name used for a software design pattern.
• It is used to alter functions and methods.
• Decorators work as wrappers, modifying the behavior of the code before and after a target function execution, without the need to modify the function itself, augmenting the original functionality.
• Basically, a decorator takes in a function, adds some functionality and returns it.
• Multiple decorators can be chained in Python.
• For ex :

def addOne(myFun):

def addOneInside(*args,**kwrgs):

return myFun(*args,**kwrgs) + 1

return addOneInside

@addOne

def oldFun( x = 1 ):

return x

print oldFun(564) # prints 565