[Python知识库]python学习第二天——装饰器

# decrator of python
# definition of func

# def func() :
# 	print('Hello world')

# def new_func() :
# 	print('decrating new_func')
# 	func()
# 	print('end decrating')

# new_func()

# when other func needs decrating, we should define another new_func
# how to resolve this problem

# def add(a, b) :
# 	return a + b
# def sub(a, b) :
# 	return a - b

# def mult(a, b) :
# 	return a * b

def new_func(func) :
	def wrapper(*args, **argvs) :
		print('decrating begin')
		ret = func(*args, **argvs)
		print('decrating end')
		return ret
	return wrapper

def new_new_func(func) :
	def wrapper(*args, **argvs) :
		print('new decrating begin')
		ret = func(*args, **argvs)
		print('new decrating end')
		return ret
	return wrapper

@new_func
def add(a, b) :
	return a + b
print(add(3, 78))

@new_new_func
@new_func
def func() :
	print('Hello world')

print(func())