decorator wrap order && decorator execution order

__wrapped__.py

from functools import wraps

def decorator1(func):
    print("start wrap1")
    @wraps(func)
    def wrapper(*args, **kwargs):
        print("in decorator1")
        result = func(*args, **kwargs)
        print("return decorator1")
        return result
    print("wrap1 finish")
    return wrapper

def decorator2(func):
    print("start wrap2")
    @wraps(func)
    def wrapper(*args, **kwargs):
        print("in decorator2")
        result = func(*args, **kwargs)
        print("return decorator2")
        return result
    print("wrap2 finish")
    return wrapper

def decorator3(func):
    print("start wrap3")
    @wraps(func)
    def wrapper(*args, **kwargs):
        print("in decorator3")
        result = func(*args, **kwargs)
        print("return decorator3")
        return result
    print("wrap3 finish")
    return wrapper


@decorator1
@decorator2
@decorator3
def addNum(x, y):
    return x+y

addNum(1,2)
#     
# print(addNum.__wrapped__(1, 2))
# print(addNum.__wrapped__.__wrapped__(1, 2))
# print(addNum.__wrapped__.__wrapped__.__wrapped__(1, 2))