Python 如何解释'；怪异'；关于uuu getattribute uuu、uuu getattr uuu的结果？

B类的定义如上所述，接下来我尝试做一些关于

\uuuuuu getattr\uuuuuuuuuu、\uuuuuuuuu getattribute\uuuuuuuu

的测试：

class B(object):
"""new style class"""

    def __getattribute__(self, name):
        print '__getattribute__ called'
        return super(B, self).__getattribute__(name)

    def __getattr__(self, name):
        print '__getattr__ called'

    def __setattr__(self, name, value):
        print '__setattr__ called'
        if name in ['forbid', 'refuse']:
            raise AttributeError('Attribute name invalid!')
        else:
            return super(B, self).__setattr__(name, value)

最后的结果是：

b = B()
setattr(b, 'test', 100)

print b.__dict__
print b.__getattribute__('__dict__')
print b.__getattr__('__dict__')
print getattr(b, '__dict__')

我的问题来了：

1.

打印b.\uuuuu getattribute\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

2.
打印b.\uuuuu getattr\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu？为什么不返回

上面的结果对我来说太奇怪了。我真的不明白这些方法是如何工作的。任何建议都非常感谢。谢谢

第一个
\uuuuu getattribute\uuuu
调用在执行
b.\uuuu getattribute\uuuu
时完成。你想得到一个名为
\uuuu getattribute\uuuu
的属性（是的，我知道这听起来很复杂）。当您请求名为
\uuuuuu getattribute\uuuuu
的属性时，将调用
\uuuuuu getattribute\uuuuu
并在结果中获得
\uuu getattribute\uuuuu
方法。然后您只需调用
\uuuuuu getattribute\uuuu
方法-这里是
\uuuuu getattribute\uuuu
的第二个调用

b.。\uuuuuGetAttr\uuuuuuuuuuuuuuu
调用
\uuuuuuuuGetAttr\uuuuuuuuuuuuuuuuuuu
（是的，我知道）。您将得到
\uu getattr\uu
方法作为回报。然后调用
\uu getattr\uu
方法。它不会显式返回任何内容，这意味着它不会隐式返回任何内容

以下是当您看到
类的某些对象时发生的简化版本。某些方法（）
：


调用
\uuuu getattribute\uuu
以获取名为
some\u method
的属性<代码>\uuuu getattribute\uuuu
打印“我被呼叫！”并将其任务委托给
对象。
（我认为，它检查类B的一些对象
\uu dict\uuuu
，检查其类
\uu dict\uuuu
，基类
\uu dict\uuuu
，处理描述符等。希望
对象。返回
一些方法
（希望是一个函数，或者更准确地说是一个绑定方法）
调用此函数/绑定方法。在您的示例中，绑定方法是
\uuu getattribute\uuu
本身。这就是它调用两次的原因
对于第二季度，
\uuuuuu getattr\uuuuuu
负责
返回无
；它所做的一切就是
打印
。对于第一季度，
\uuuuuu getattribute\uuuuuuuuu
被调用来解析
\uuuu getattribute\uuuuuuuuuuuuuu
！@jornsharpe Q2，在调用
\uuuuuuuuu getattr\uu
之前，
\uuuuuuuu getattribute的代码在哪里
\uuuuuu getattribute\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu
，和
b.\uuuu getattribute\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu！我明白了：）@Nigel tufnel根据我上面的评论，例如
b.\uu getattribute\uuuu（）
是
b.\uu getattribute\uuuu（“\uu getattribute\uuuuu”）（）
__getattribute__ called
{'test': 100}
__getattribute__ called
__getattribute__ called
{'test': 100}
__getattribute__ called
__getattr__ called
None
__getattribute__ called
{'test': 100}