1 import time
 2
 3 def func1():
 4     print('in func1')
 5
 6 def timer(func):
 7     def inner():
 8         start = time.time()
 9         func()
10         print(time.time() - start)
11     return inner
12
13 func1 = timer(func1)
14 func1()

 1 import time
 2 def timer(func):
 3     def inner():
 4         start = time.time()
 5         func()
 6         print(time.time() - start)
 7     return inner
 8
 9 @timer   #==> func1 = timer(func1)
10 def func1():
11     print('in func1')
12
13
14 func1()

 1 def timer(func):
 2     def inner(a):
 3         start = time.time()
 4         func(a)
 5         print(time.time() - start)
 6     return inner
 7
 8 @timer
 9 def func1(a):
10     print(a)
11
12 func1(1)
13
14 装饰器——带参数的装饰器

 1 import time
 2 def timer(func):
 3     def inner(*args,**kwargs):
 4         start = time.time()
 5         re = func(*args,**kwargs)
 6         print(time.time() - start)
 7         return re
 8     return inner
 9
10 @timer   #==> func1 = timer(func1)
11 def func1(a,b):
12     print('in func1')
13
14 @timer   #==> func2 = timer(func2)
15 def func2(a):
16     print('in func2 and get a:%s'%(a))
17     return 'fun2 over'
18
19 func1('aaaaaa','bbbbbb')
20 print(func2('aaaaaa'))

 1 import time
 2 def timer(func):
 3     def inner(*args,**kwargs):
 4         start = time.time()
 5         re = func(*args,**kwargs)
 6         print(time.time() - start)
 7         return re
 8     return inner
 9
10 @timer   #==> func2 = timer(func2)
11 def func2(a):
12     print('in func2 and get a:%s'%(a))
13     return 'fun2 over'
14
15 func2('aaaaaa')
16 print(func2('aaaaaa'))

1 1 def index():
2 2     '''这是一个主页信息'''
3 3     print('from index')
4 4
5 5 print(index.__doc__)    #查看函数注释的方法
6 6 print(index.__name__)   #查看函数名的方

 1 from functools import wraps
 2
 3 def deco(func):
 4     @wraps(func) #加在最内层函数正上方
 5     def wrapper(*args,**kwargs):
 6         return func(*args,**kwargs)
 7     return wrapper
 8
 9 @deco
10 def index():
11     '''哈哈哈哈'''
12     print('from index')
13
14 print(index.__doc__)
15 print(index.__name__)

#普通版本
def timer(func):def inner(*args,**kwargs):'''执行函数之前要做的'''re = func(*args,**kwargs)'''执行函数之后要做的'''return rereturn inner
# wraps版本
from functools import wrapsdef deco(func):@wraps(func) #加在最内层函数正上方def wrapper(*args,**kwargs):return func(*args,**kwargs)return wrapper

 1 def outer(flag):
 2     def timer(func):
 3         def inner(*args,**kwargs):
 4             if flag:
 5                 print('''执行函数之前要做的''')
 6             re = func(*args,**kwargs)
 7             if flag:
 8                 print('''执行函数之后要做的''')
 9             return re
10         return inner
11     return timer
12
13 @outer(False)
14 def func():
15     print(111)
16
17 func()

 1 def wrapper1(func):
 2     def inner():
 3         print('wrapper1 ,before func')
 4         func()
 5         print('wrapper1 ,after func')
 6     return inner
 7
 8 def wrapper2(func):
 9     def inner():
10         print('wrapper2 ,before func')
11         func()
12         print('wrapper2 ,after func')
13     return inner
14
15 @wrapper2
16 @wrapper1
17 def f():
18     print('in f')
19
20 f()