关于python装饰器

1 def logger(func):
2      def inner(*args, **kwargs):
3          print "Arguments were: %s, %s" % (args, kwargs)
4          return func(*args, **kwargs)
5      return inner

@logger
 def foo1(x, y=1):
     return x * y
@logger
 def foo2():
     return 2
foo1(5, 4)
#Arguments were: (5, 4), {}
#20
foo1(1)
#Arguments were: (1,), {}
#1
foo2()
#Arguments were: (), {}
#2

def outer(arg):  
    def wraper(func):  
        def inner():  
            print("before %s called [%s]." % (func.__name__, arg))  
            func()  
            print("  after %s called [%s]." % (func.__name__, arg))  
        return inner
    return wraper

@outer("mytest")  
def foo():  
    print(" foo() called.")  
 
foo()