python 修饰符（转载）

首先一个修饰符的实例：

 #!/usr/bin/env python  

 def run(fn):
     def do_hello():
         print "begin..."
         fn()
         print "end."
     return do_hello  

 @run
 def hello():
     print "Hello World!"  

 if __name__ == '__main__':
     hello() 

修饰符@也可也可以用多個，先加 @run_b 再加@run

@run

@run_b

def hello():

print "hello world!"

上面的例子是在function中使用修饰符，也可以在class中使用修饰符。

 class entryExit(object):  

     def __init__(self, f):
         self.f = f  

     def __call__(self):
         print "Entering", self.f.__name__
         self.f()
         print "Exited", self.f.__name__  

 @entryExit
 def func1():
     print "inside func1()"  

 @entryExit
 def func2():
     print "inside func2()"