动态创建类实例的最有效方法是什么？ [英] What is the most efficient way to dynamically create class instances?

问题描述

一开始我不知道会有多少个类实例，所以我需要动态创建它们，但是我也想保持代码整洁和可读。

I don't know how many class instances I will have from the get-go, so I need to create them dynamically, but I would also like to keep the code tidy and readable.

我正在考虑做这样的事情：

I was thinking of doing something like this:

names = ['Jon','Bob','Mary']

class Person():
    def __init__(self, name):
        self.name = name

people = {}
for name in names:
    people[name] = Person(name)

它有效，但是我似乎找不到任何人在网上进行此操作的示例（尽管我看起来并不多）。有什么理由我应该避免这样做吗？如果是这样，为什么以及什么是更好的替代方法？

It works, but I can't seem to find any examples of people doing this online (though I didn't look much). Is there any reason I should avoid doing this? If so, why and what is a better alternative?

推荐答案

如果要动态创建类实例，这正是您所需要的。是在您的代码中执行的，那么我认为您的解决方案看起来非常好，并且是执行此操作的Python方法（尽管我必须说当然还有其他方法）。只是为了给您一些思考：您可以使用这样的类注册/存储每个新实例：

If you want to create class instances dynamically, which is exactly what you are doing in your code, then I think your solution looks perfectly fine and is a pythonic way to do so (although I have to say there are of course other ways). Just to give you some food for thought: you could register/store each new instance with the class like that:

class Person():
    people={}
    @classmethod
    def create(cls,name):
        person=Person(name)
        cls.people[name]=person
        return person
    def __init__(self, name):
        self.name = name

如果您喜欢冒险，可以尝试使用元类，但是我将其留给您研究：-）

And if you are getting adventerous, you can try the same with metaclass, but I will leave that for your research :-)

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