装饰器 | 参数 |demo
----
====== 不带参数的装饰器 ======

<code>
def dec(fun):
    def _fun(*arg,**args):
        print "pre"
        print args
        res=fun(*arg)
        print "after"
        return res
    return _fun

@dec
def a(i,j,a='0'):
    print 'run  fun a'
    return i+j
    
print a(3,4,a='b')
</code>
====== 带参数的装饰器 ======
<code>
def decc(i):
    def dec(fun):
        def _fun(*arg,**args):
            print "pre"
            print args,i
            res=fun(*arg)
            print "after"
            return res
        return _fun
    return dec

@decc(100)
def b(a,b,c='aa'):
    return a+b

print b(1,2,a='aaa')
</code>