python裝飾器應用demo，統計函數耗時

def runtime(func):
        def __runtime__(*args,**kwargs):
                tbeg = time.time()
                func(*args,**kwargs)
                tend = time.time()
                print "RUNTIME %f"%(tend - tbeg)
        return __runtime__

@runtime
def sayhello(string):
        print string


if __name__ == "__main__":
    sayhello("hello")

輸出結果：

hello
RUNTIME 0.000036