python装饰器的疑问,问题长度不够

Question

def wrapper(func):
    print 'before'
    func()
    print 'after'
    return func


@wrapper
def yuan():
    print 'yuan called'

yuan()
yuan()

这段代码执行的结果是这样的:
before
yuan called
after
yuan called
yuan called

为什么第二个yuan()执行的时候,装饰器没有起作用?我用的Python2.7

Answer 1

你的实现有点问题

def wrapper(func):
    def _wrapper():
        print 'before'
        func()
        print 'after'
    return _wrapper


@wrapper
def yuan():
    print 'yuan called'