Decorator Chaining

We can define multiple decorators for the same function and all these decorators will form decorator chaining.

Syntax

Python

@decor1
@decor
def fun():
  # Business Requirment

For fun() function we are applying 2 decorator functions. First inner decorator will work then outer decorator.

Example

Python

def decor1(func):
  print('decor1 executed')
  def inner():
    x=func()
    return x*x
  return inner

def decor(func):
  print('decor executed')
  def inner():
    x=func()
    return 2*x
  return inner

@decor1
@decor
def num():
    return 10
print(num())

Output

PowerShell

decor executed
decor1 executed
400

Example

Python

def decor(func):
  def inner(name):
    print("First Decor(decor) Function Execution")
    func(name)
  return inner

def decor1(func):
  def inner(name):
    print("Second Decor(decor1) Execution")
    func(name)
  return inner

@decor1
@decor
def wish(name):
    print("Hello",name,"Good Morning")
wish("Naveen")

Output

PowerShell

Second Decor(decor1) Execution
First Decor(decor) Function Execution
Hello Naveen Good Morning

Ungraded Questions

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