Python3 之装饰器

 1 # Author = Johnston
 2 import time
 3 def timer(func):
 4     def deco():
 5         start_time = time.time()
 6         func()
 7         end_time = time.time()
 8         print("the function run time is %s" %(end_time-start_time))
 9     return deco
10 
11 @timer  #bar = timer(bar),@time必须写在需装饰的函数前面
12 def bar():
13     time.sleep(3)
14     print("in the bar")
15 
16 bar()

# Author = Johnston
import time
def timer(func):
    def deco(name):                       #传递参数name
        start_time = time.time()
        func(name)
        end_time = time.time()
        print("the function run time is %s" %(end_time-start_time))
    return deco

@timer  #bar = timer(bar)，@timer必须写在需装饰的函数前面
def bar(name):
    time.sleep(3)
    print("%s is in the bar" %name)

bar("Johnston")

 1 # Author = Johnston
 2 import time
 3 def outpara(type):
 4     def timer(func):
 5         def deco(name):
 6             if type==1:          #根据外参数作为判断执行条件
 7                 start_time = time.time()
 8                 func(name)
 9                 end_time = time.time()
10                 print("the function run time is %s" %(end_time-start_time))
11             else:
12                 print("wrong type")
13         return deco
14     return timer
15 
16 @outpara(type=1)  #传递条件参数，@outpara必须写在需装饰的函数前面
17 def bar(name): 
18 　　time.sleep(3) 
19 　　print("%s is in the bar" %name) 
20 
21 bar("Johnston")