什么时候应该在Python中使用类型检查? [英] When should I use type checking (if ever) in Python?

问题描述

我开始学习Python，作为一名主要的Java开发人员，我最大的问题是了解何时以及何时不使用类型检查.大多数人似乎在说Python代码不需要进行类型检查，但是在很多情况下，我认为这是必要的.例如，假设我需要使用一个方法参数来执行算术运算，为什么我不应该确保该参数是数字数据类型呢?

I'm starting to learn Python and as a primarily Java developer the biggest issue I am having is understanding when and when not to use type checking. Most people seem to be saying that Python code shouldn't need type checking, but there are many cases when I believe it is necessary. For example, let's say I need to use a method parameter to perform an arithmetic operation, why shouldn't I make sure the argument is a numeric data type?

此问题不仅限于功能.对于类变量，我也经历了同样的思考过程.为什么以及何时不应该使用属性(使用@property)而不是定期执行的类变量来检查类型?

This issue is not only limited to functions. The same thought process occurs to me for class variables. Why and when should I or shouldn't I use properties (using @property) to check type instead of regularly implemented class variables?

这对我来说是一种新的发展方式，希望能帮助我理解.

This is a new way of approaching development for me so I would appreciate help understanding.

推荐答案

不是 Pythonic 来检查类型信息，而是使用鸭子类型:如果它看起来像鸭子一样 ，走路像鸭子一样， quacks 像鸭子一样，然后是鸭子.

It's not Pythonic to check type info, use duck typing instead: if it looks like a duck, walks like a duck and quacks like a duck then it is a duck.

def quack(duck):
    duck.quack()

这仅在duck具有可调用的quack属性时运行，否则将引发异常，否则可能被调用者捕获.

this will only run if duck has a callable quack attrubute, it will raise an exception otherwise which can be caught by the caller.

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