简体繁体 English

python：选择性地覆盖getattr

[英]python: selectively override __getattr__

原文 2017-08-01 16:47:28 9 1 python/ function/ methods/ getattr

I have successfully overridden the __getattr__ method in order to allow for complex behavior. 我已经成功重写了__getattr__方法，以允许复杂的行为。 However I still would like to allow some of the __builtin__ functions to be default. 但是，我仍然希望允许某些__builtin__函数为默认函数。 For example, I have used __getattr__ to handle __add__ , __sub__ , __mul__ , etc. However, the __iadd__ , __isub__ , __imul__ , etc. are trying to use the __getattr__ method and are throwing an error. 例如，我已经使用__getattr__处理__add__ ， __sub__ ， __mul__ ，等等。然而， __iadd__ ， __isub__ ， __imul__等正在尝试使用__getattr__方法，并抛出一个错误。 I could just define their behaviors as well, but I think that allowing these methods to run as default would be better. 我也可以定义它们的行为，但是我认为允许这些方法默认运行会更好。

Bottom line: I would like to allow __getattr__ to filter which attributes it handles, and which it allows to run as default. 底线：我想允许__getattr__过滤它处理的属性，以及允许它默认运行的属性。

1 个解决方案

Answered my own question. 回答了我自己的问题。 I used if statements to handle groups of attributes, and then as a last resort, used return getattr(my_cls_name, attr) to allow any other builtin function to run normally. 我使用if语句来处理属性组，然后作为最后的选择，使用return getattr(my_cls_name, attr)来允许任何其他内置函数正常运行。 So now when it realizes there is no __iadd__ handler, it uses my __add__ instead. 因此，现在当它意识到没有__iadd__处理程序时，它将使用我的__add__代替。 same with the other operators. 与其他运营商相同。