示例1
from time import ctime,sleep
#导包就不需要使用包名.函数了
def timefun(func):
def wrappedfunc():
print("%s called at %s"%(func.__name__,ctime()))
func()#内部函数需要使用外部函数的参数
return wrappedfunc#返回内部函数
@timefun #timefun是一个闭包函数
def foo():#将foo函数传递给timefun闭包函数
print("I'm foo ")
foo()
sleep(3)
foo()
'''
foo called at Fri May 8 01:00:18 2020
I'm foo
foo called at Fri May 8 01:00:21 2020
I'm foo
'''
示例2
from time import ctime,sleep
import functools
def timefun(func):
#functools.wraps(func)
def wrappedfunc(a,b):#使用了timefun函数的参数a，b
print("%s called at %s"%(func.__name__,ctime()))
print(a,b)
func(a,b)
return wrappedfunc
@timefun
def foo(a,b):
print(a+b)
foo(3,5)
sleep(2)
foo(2,4)
'''
foo called at Fri May 8 01:01:16 2020
3 5
8
foo called at Fri May 8 01:01:18 2020
2 4
6
'''
示例3
from time import ctime,sleep
def timefun(func):
def wrappedfunc(*args,**kwargs):
# *args主要是元组，列表，单个值的集合
# **kwargs 主要是键值对，字典
print("%s called at %s"%(func.__name__,ctime()))
func(*args,**kwargs)
return wrappedfunc
@timefun
def foo(a,b,c):
print(a+b+c)
foo(3,5,7)
sleep(2)
foo(2,4,9)
'''
foo called at Fri May 8 01:01:38 2020
15
foo called at Fri May 8 01:01:40 2020
15
'''
示例4
def timefun(func):
def wrappedfunc( ):
return func( )#闭包函数返回调用的函数(原函数有return)
return wrappedfunc
@timefun
def getInfo():
return '----haha----'
info = getInfo()#接收函数的返回值
print(info)#输出getInfo 如果闭包函数没有return 返回，则为None
'''
----haha----
'''
示例5
from time import ctime,sleep
def timefun_arg(pre = "Hello"):#使用了pre默认参数
def timefun(func):
def wrappedfunc():#闭包函数嵌套闭包函数
print("%s called at %s"%(func.__name__,ctime()))
print(pre)
# func.__name__函数名 ctime()时间
return func#返回使用了装饰器的函数
return wrappedfunc
return timefun
@timefun_arg("foo的pre")#对闭包函数中最外部函数进行形参传递pre
def foo( ):
print("I'm foo")
@timefun_arg("too的pre")
def too():
print("I'm too")
foo()
sleep(2)
foo()
too()
sleep(2)
too()
'''foo called at Fri May 8 01:02:34 2020
foo的pre
foo called at Fri May 8 01:02:36 2020
foo的pre
too called at Fri May 8 01:02:36 2020
too的pre
too called at Fri May 8 01:02:38 2020
too的pre
'''
2020-05-08