decorator-装饰器

decorator

# 无参仅需2层函数
def log_print(func):
	def wrapper(*args, **kwargs):
		print("before " + func.__name__)
		result = func(*args, **kwargs)
		print("after " + func.__name__)
		return result
	return wrapper

# 有参3层函数
def log_print2(params: bool = False):
	def decorator(func):
		def wrapper(*args, **kwargs):
			print(f"bool:{params}")
			print("before " + func.__name__)
			result = func(*args, **kwargs)
			print("after " + func.__name__)
			return result
		return wrapper
	return decorator
def test(a, b):
	print(f"入参项为:{a},{b}")
	return a + b


@log_print2(params=True)
def test2(a, b):
	print(f"入参项为:{a},{b}")
	return a + b

test(1, 2)

test2(1, 2)`

装饰器2

import functools
def my_demo_new(name = any,value = any):
    def my_demo(f):
        print(f"my_demo function {name}  {value}")
        
        @functools.wraps(f)
        def wrapper(*args, **kwargs):
            print("wrapper of my_demo")
            return f(*args, **kwargs)
        return wrapper
    return my_demo


@my_demo_new(value="AAA",name="1111")
def test(x,y,z):
    """
    hello test
    """
    print("test function {}".format(x))



test(1,2,3)

test.__name__
test.__doc__