python之装饰器

 1 import time
 2 def cal(l):
 3     start_time=time.time()
 4     res=0
 5     for i in l:
 6         time.sleep(0.1)
 7         res+=i
 8     stop_time = time.time()
 9     print(‘函数的运行时间是%s‘ %(stop_time-start_time))
10     return res
11 
12 print(cal(range(100)))

 1 import time
 2 def timmer(func):
 3     def wrapper(*args,**kwargs):
 4         start_time=time.time()
 5         res=func(*args,**kwargs)
 6         stop_time = time.time()
 7         print(‘函数运行时间是%s‘ %(stop_time-start_time))
 8         return res
 9     return wrapper
10 @timmer
11 def cal(l):
12     res=0
13     for i in l:
14         time.sleep(0.1)
15         res+=i
16     return res
17 
18 res=cal(range(10))
19 print(res)