分層次理解python裝飾器

import logging
#普通裝飾器
def foo1(func):
    def wrapper(*args,**kwargs):
        logging.warn('I am %s'%func.__name__)
        func(*args,**kwargs)
    return wrapper
@foo1
def bar1(num):
    print 'I am bar1',num+1

bar1(9)

#帶參數的裝飾器
def foo2(level='漂亮'):
    def decorator(func):
        def wrapper(*args,**kwargs):
            logging.warn('I am %s%s'%(func.__name__,level))
            if level=='漂亮':
                print '果然是個大美人！'
            else:
                print '呵呵，有點失望哦！'
            func(*args,**kwargs)
        return wrapper
    return decorator

@foo2('漂亮')
def bar2(num):
    print num-1

bar2(9)

#類裝飾器
class Decorator():
    def __init__(self,func):
        self._func=func

    def __call__(self, *args, **kwargs):
        logging.warn('I am %s'%self._func.__name__)
        self._func(*args,**kwargs)

@Decorator
def bar3(str):
    print str

bar3('妹子好靚！')