Python Tutorial for Beginners 49 - Python Decorators- https://youtu.be/o77mO0ZOzkIIn this Python Programming Tutorial for Beginners video I am going to show you How to use decorators in Python.

decorators_example1.py

def decorator_func(func):
    def wrapper_func():
        print('X' * 20)
        func()
        print('Y' * 20)

    return wrapper_func

@decorator_func
def say_hello():
    print('Hello World')

#hello = decorator_func(say_hello)
#hello()
say_hello()
# ----------------------------------------------------
def decorator_X(func):
    def wrapper_func():
        print('X' * 20)
        func()
        print('X' * 20)

    return wrapper_func

def decorator_Y(func):
    def wrapper_func():
        print('Y' * 20)
        func()
        print('Y' * 20)

    return wrapper_func
@decorator_X
@decorator_Y
def say_hello_again():
    print('Hello World')

#hello = decorator_X(decorator_Y(say_hello_again))
#hello()
say_hello_again()

decorators_example2.py

def decorator_divide(func):
    def wrapper_func(a, b):
        print('divide ', a, ' and ', b)
        if b == 0:
            print('division with zero is not allowed')
            return 0
        return a / b

    return wrapper_func

@decorator_divide
def divide(x, y):
    return x / y

print(divide(15, 0))

decorators_example3.py

from time import  time
def timing(func):
    def wrapper_func(*args, **kwargs):
      start = time()
      print(start)
      result = func(*args, **kwargs)
      end = time()
      print(end)
      print('Elapsed time: {}'.format(end - start))
      return result

    return wrapper_func

@timing
def my_func(num):
    sum = 0
    for i in range(num+1):
        sum += i

    return sum

print(my_func(20000000))