The best way to understand the decoration

Question

Hi guys!

Code:
****************

def decor(func):
print ("decor(func) is running one time only.")

def wrap():
print("============")
func()
print("============")
return wrap

def print_text():
print("Hello world!")

print_text = decor(print_text)
print("decor(func) will never work again.")

print_text();
print_text();
print_text();

Output:
****************

decor(func) is running one time only.
decor(func) will never work again.
============
Hello world!
============
============
Hello world!
============
============
Hello world!
============

Answer 1

Deconstruct it and rebuild it function by function?

Answer 2

What is the question?