Python 中的魔术方法

发布于 2024-09-05 18:11:13 字数 778 浏览 4 评论 0原文

我对 Python 有点陌生，我想知道是否有一种方法可以创建类似 PHP 中的神奇方法的东西（http://www.php.net/manual/en/language.oop5.overloading.php#language.oop5.overloading.methods)

我的目标是简化模型中子类的访问。我基本上有一个父类，它有 n 个子类。这些类具有三个值：语言键、翻译键和翻译值。它们描述了一种通用翻译处理。父类可以有不同语言的不同翻译键的翻译。例如，键“标题”可以翻译成德语和英语，键“描述”也可以（到目前为止等等）

我不想获取子类并按设置值进行过滤（至少我想要，但是没有明确说明，魔术方法背后的具体实现会做到这一点）。我想请求

parent_class.title['de']
# or also possible maybe
parent_class.title('de')

将标题翻译成德语 (de)。

因此必须有一个神奇的方法来获取被调用方法的名称及其参数（如 PHP 中）。据我深入研究Python，这只能通过简单的属性（__getattr__，__setattr__）或直接在类中设置/获取（__getitem__，__setitem__）来实现，这两者都不符合我的需求。

也许有一个解决方案？请帮忙！提前致谢！

原文

I'm kind of new to Python and I wonder if there is a way to create something like the magic methods in PHP (http://www.php.net/manual/en/language.oop5.overloading.php#language.oop5.overloading.methods)

My aim is to ease the access of child classes in my model. I basically have a parent class that has n child classes. These classes have three values, a language key, a translation key and a translation value. The are describing a kind of generic translation handling. The parent class can have translations for different translation key each in different languages. E.g. the key "title" can be translated into german and english and the key "description" too (and so far and so on)

I don't want to get the child classes and filter by the set values (at least I want but not explicitly, the concrete implementation behind the magic method would do this). I want to call

parent_class.title['de']
# or also possible maybe
parent_class.title('de')

for getting the translation of title in german (de).

So there has to be a magic method that takes the name of the called method and their params (as in PHP). As far as I dug into Python this is only possible with simple attributes (__getattr__, __setattr__) or with setting/getting directly within the class (__getitem__, __setitem__) which both do not fit my needs.

Maybe there is a solution for this? Please help!
Thanks in advance!

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温柔女人霸气范 2024-09-12 18:11:13

返回parent_class.title 的对象，该对象具有__getitem__ 方法。

class parent_class:
    def __init__(self):
        self.title = multilang("hello world");

class multilang:
    def __init__(self, text):
        pass
    def __getitem__(self, key):
        if key == 'en':
            return "hello world";

Return an object for parent_class.title which has a __getitem__ method.

class parent_class:
    def __init__(self):
        self.title = multilang("hello world");

class multilang:
    def __init__(self, text):
        pass
    def __getitem__(self, key):
        if key == 'en':
            return "hello world";

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溇涏 2024-09-12 18:11:13

您可以将代码重构为 parent_class['de'].title。那么这样的事情可能会起作用

from collections import defaultdict

class X(object):
    def __init__(self, title = "", description = ""):
        self.title = title
        self.description = description

parent_class = defaultdict(X)

parent_class['en'] = X("title", "description")
parent_class['de'].title = "Titel"

You could could refactor your code to parent_class['de'].title. Then something like this would probaly work

from collections import defaultdict

class X(object):
    def __init__(self, title = "", description = ""):
        self.title = title
        self.description = description

parent_class = defaultdict(X)

parent_class['en'] = X("title", "description")
parent_class['de'].title = "Titel"

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~没有更多了~