装饰器：又叫包装函数
作用: 1. 添加说明,提醒等. 2. 添加登,验证陆装饰器
原理是在执行student时会把student作为deco的参数传到deco中执行,student函数在deco的子函数wrapper中做为参数被执行.(即在装饰器的装饰下执行函数)
def deco(func):
def wrapper():
print("======start====")
func()
print("======end====")
return wrapper
@deco
def student():
print ("student")
student()
#加了装饰器,函数就作为装饰器的参数被执行,通过wrapper返回结果
注意:解决形参问题,在装饰器中用可变参数
def deco(func):
def wrapper(*args):
print("======start====")
func(*args)
print("======end====")
return wrapper
@deco
def student(name, age):
print("student info name is {} age {}".format(name, age))
student("guohongze", 35)
完整装饰器:
def logging(level):
def wrapper(func):
def inner_wrapper(*args, **kwargs):
print("[{level}]: enter function {func}()".format(
level=level,
func=func.__name__))
return func(*args, **kwargs)
return inner_wrapper
return wrapper
@logging(level='INFO')
def say(something):
print("say {}!".format(something))
@logging(level='INFO')
def hello(name, age, sex):
print("hello student")
print("your name is {}".format(name))
print("your age is {}".format(age))
print("your sex is {}".format(sex))
say("hello world!")
hello("hf", 35, "male")