import time

def timer(func):  #timer(test1)  func=test1
    def deco(*args,**kwargs):
        start_time=time.time()
        func(*args,**kwargs)
        stop_time=time.time()
        print("the func run time %s" %(stop_time-start_time))
    return deco

@timer  #test1=timer(test1)
def test1():
    time.sleep(3)
    print("in the test1")

@timer
def test2(name,age):
    time.sleep(2)
    print("in the test2" ,name,age)


test1()
test2("joan",5)


输出结果：

in the test1
the func run time 3.0043931007385254
in the test2 joan 5
the func run time 2.0034029483795166

python装饰器小例子