__getattr__保持返回无，甚至当我试图返回值

Question

尝试运行下面的代码：

class Test(object): 
def func_accepting_args(self,prop,*args): 
    msg = "%s getter/setter got called with args %s" % (prop,args) 
    print msg #this is prented 
    return msg #Why is None returned? 

def __getattr__(self,name): 
    if name.startswith("get_") or name.startswith("set_"): 
     prop = name[4:] 
     def return_method(*args): 
      self.func_accepting_args(prop,*args) 
     return return_method 
    else: 
     raise AttributeError, name 

x = Test() 
x.get_prop(50) #will return None, why?!, I was hoping it would return msg from func_accepting_args 

任何与解释为什么返回None？

Answer 1

return_method()不返回任何东西。它应该返回的包裹func_accepting_args()结果：

def return_method(*args): 
    return self.func_accepting_args(prop,*args) 

Answer 2

因为return_method（）没有返回值。它只是跌破底部，因此你得到无。