： ，
# -*- coding:gbk -*-
''' 1: , '''
def myfunc():
print("myfunc() called.")
myfunc()
myfunc()
：
# -*- coding:gbk -*-
''' 2: ( )
，
: myfunc = deco(myfunc)'''
def deco(func):
print("before myfunc() called.")
func()
print(" after myfunc() called.")
return func
def myfunc():
print(" myfunc() called.")
myfunc= deco(myfunc)
myfunc()
myfunc()
： @
# -*- coding:gbk -*-
''' 3: @ ， “myfunc = deco(myfunc)”
， '''
def deco(func):
print("before myfunc() called.")
func()
print(" after myfunc() called.")
return func
@deco
def myfunc():
print(" myfunc() called.")
myfunc()
myfunc()
：
# -*- coding:gbk -*-
''' 4: ，
， '''
def deco(func):
def _deco():
print("before myfunc() called.")
func()
print(" after myfunc() called.")
# func，
return _deco
@deco
def myfunc():
print(" myfunc() called.")
return 'ok'
myfunc()
myfunc()
：
# -*- coding:gbk -*-
''' 5: ，
， '''
def deco(func):
def _deco(a, b):
print("before myfunc() called.")
ret= func(a, b)
print(" after myfunc() called. result: %s" % ret)
return ret
return _deco
@deco
def myfunc(a, b):
print(" myfunc(%s,%s) called." % (a, b))
return a+ b
myfunc(1,2)
myfunc(3,4)
：
# -*- coding:gbk -*-
''' 6: ，
(*args, **kwargs)， '''
def deco(func):
def _deco(*args,**kwargs):
print("before %s called." % func.__name__)
ret= func(*args,**kwargs)
print(" after %s called. result: %s" % (func.__name__, ret))
return ret
return _deco
@deco
def myfunc(a, b):
print(" myfunc(%s,%s) called." % (a, b))
return a+b
@deco
def myfunc2(a, b, c):
print(" myfunc2(%s,%s,%s) called." % (a, b, c))
return a+b+c
myfunc(1,2)
myfunc(3,4)
myfunc2(1,2,3)
myfunc2(3,4,5)
：
# -*- coding:gbk -*-
''' 7: 4 ， ，
。
'''
def deco(arg):
def _deco(func):
def __deco():
print("before %s called [%s]." % (func.__name__, arg))
func()
print(" after %s called [%s]." % (func.__name__, arg))
return __deco
return _deco
@deco("mymodule")
def myfunc():
print(" myfunc() called.")
@deco("module2")
def myfunc2():
print(" myfunc2() called.")
myfunc()
myfunc2()
：
# -*- coding:gbk -*-
''' 8: '''
class locker:
def __init__(self):
print("locker.__init__() should be not called.")
@staticmethod
def acquire():
print("locker.acquire() called.（ ）")
@staticmethod
def release():
print(" locker.release() called.（ ）")
def deco(cls):
'''cls acquire release '''
def _deco(func):
def __deco():
print("before %s called [%s]." % (func.__name__,cls))
cls.acquire()
try:
return func()
finally:
cls.release()
return __deco
return _deco
@deco(locker)
def myfunc():
print(" myfunc() called.")
myfunc()
myfunc()
： ， py ，
# -*- coding:gbk -*-
'''mylocker.py: for 9.py'''
class mylocker:
def __init__(self):
print("mylocker.__init__() called.")
@staticmethod
def acquire():
print("mylocker.acquire() called.")
@staticmethod
def unlock():
print(" mylocker.unlock() called.")
class lockerex(mylocker):
@staticmethod
def acquire():
print("lockerex.acquire() called.")
@staticmethod
def unlock():
print(" lockerex.unlock() called.")
def lockhelper(cls):
'''cls acquire release '''
def _deco(func):
def __deco(*args,**kwargs):
print("before %s called." % func.__name__)
cls.acquire()
try:
return func(*args,**kwargs)
finally:
cls.unlock()
return __deco
return _deco
# -*- coding:gbk -*-
''' 9: ， py
'''
from mylockerimport *
class example:
@lockhelper(mylocker)
def myfunc(self):
print(" myfunc() called.")
@lockhelper(mylocker)
@lockhelper(lockerex)
def myfunc2(self, a, b):
print(" myfunc2() called.")
return a+ b
if __name__=="__main__":
a= example()
a.myfunc()
print(a.myfunc())
print(a.myfunc2(1,2))
print(a.myfunc2(3,4))
， ， ：
1. Python http://blog.csdn.net/thy38/article/details/4471421
2. Python http://www.cnblogs.com/huxi/archive/2011/03/01/1967600.html
3. Python http://apps.hi.baidu.com/share/detail/17572338