python装饰器入门-白红宇

按别人的教程弄的。
要清楚基于类和基于函数的实现的不同之处。
#!/usr/bin/env python# -*- coding: utf-8 -*-'''class entryExit(object):    def __init__(self, f):        self.f = f    def __call__(self):        print "Enering", self.f.__name__        self.f()        print "Exited", self.f.__name__def entryExit(f):    def new_f():        print "Entering", f.__name__        f()        print "Exited", f.__name__    return new_f@entryExitdef func1():    print "inside func1()"@entryExitdef func2():    print "inside func2()"func1()func2()class decoratorWithoutArguments(object):    def __init__(self, f):        print "Inside __init__()"        self.f = f    def __call__(self, *args):        print "Inside __call__()"        self.f(*args)        print "After self.f(*args)"@decoratorWithoutArgumentsdef sayHello(a1, a2, a3, a4):    print 'sayHello arguments:', a1, a2, a3, a4print "After decoration"print "Preparing to call sayHello()"sayHello("say", "hello", "argument", "list")print "After first sayHello() call"sayHello("a", "different", "set of", "arguments")print "After second sayHello() call"class decoratorWithArguments(object):    def __init__(self, arg1, arg2, arg3):        print "Inside __init__()"        self.arg1 = arg1        self.arg2 = arg2        self.arg3 = arg3    def __call__(self, f):        print "Inside __call__()"        def wrapped_f(*args):            print "Inside wrapped_f()"            print "Decorator arguments:", self.arg1, self.arg2, self.arg3            f(*args)            print "After f(*args)"        return wrapped_f@decoratorWithArguments("hello", "world", 42)def sayHello(a1, a2, a3, a4):    print 'sayHello arguments:', a1, a2, a3, a4print "After decoration"print "Preparing to call sayHello()"sayHello("say", "hello", "argument", "list")print "After first sayHello() call"sayHello("a", "different", "set of", "arguments")print "After second sayHello() call"'''def decoratorFunctionWithArguments(arg1, arg2, arg3):    def wrap(f):        print "Inside wrap()"        def wrapped_f(*args):            print "Inside wrapped_f()"            print "Decorator arguments:", arg1, arg2, arg3            f(*args)            print "After f(*args)"        return wrapped_f    return wrap@decoratorFunctionWithArguments("Hello", "world", 42)def sayHello(a1, a2, a3, a4):    print 'sayHello arguments:', a1, a2, a3, a4print "After decoration"print "Preparing to call sayHello()"sayHello("say", "hello", "argument", "list")print "After first sayHello() call"sayHello("a", "different", "set of", "arguments")print "After second sayHello() call"