python装饰器

 1 import time
 2 def show_time(func):# 装饰器函数调用原功能函数并返回一个新的函数对象
 3     def inner():
 4         start = time.time()
 5         func()
 6         end = time.time()
 7         print(‘函数执行时间为;%s‘ % (end - start))
 8     return inner
 9 
10 @show_time# 这一步相当于func1 = show_time(func1)
11 def func1():
12     print(‘func1‘)
13     time.sleep(1)
14     print(‘func1 again‘)
15 func1()# 在这里调用func1实际上是执行了show_time函数里的inner函数

 1 import time
 2 def show_time2(func):# 带参数函数的装饰,修改inner的参数就好了
 3     def inner(values):
 4         start = time.time()
 5         func(values)
 6         end = time.time()
 7         print(‘函数执行时间为;%s‘ % (end - start))
 8     return inner
 9 @show_time2
10 def func2(values):
11     print(values)
12     time.sleep(1)
13     print(‘%s again‘ % values)
14     print(type(values))
15 func2(123)
16 
17 
18 # *************************假装是分割线*************************
19 def add_show_time(func):# 带参数函数的装饰,修改inner的参数就好了
20     def inner(*args):
21         start = time.time()
22         func(*args)
23         end = time.time()
24         print(‘函数执行时间为;%s‘ % (end - start))
25     return inner
26 @add_show_time
27 def add(*args):
28     amount = 0
29     for i in args:
30         amount += i
31     print(amount)
32     time.sleep(1)
33     return amount
34 
35 add(1,2,3,4)

1 def func3():
2     print(‘1234‘)
3 func3()
4 print(type(func3))
5 
6 func3 = ‘1234‘
7 print(func3)
8 print(type(func3))

 1 def add_show_time(flag):
 2     def show_time(func):
 3         def inner(*args):
 4             start = time.time()
 5             func(*args)
 6             end = time.time()
 7             print(‘函数执行时间为;%s‘ % (end - start))
 8             print(‘这是装饰器传入的参数:%s‘ % flag)
 9         return inner
10     return show_time
11 @add_show_time(‘Nathaniel‘)# 实际上就是将装饰器进行一次封装,再返回装饰器对象
12 # add = add_show_time(‘Nathaniel‘)
13 def add(*args):
14     amount = 0
15     for i in args:
16         amount += i
17     print(amount)
18     time.sleep(1)
19     return amount
20 
21 add(1,2,3,4)