在Python中使用变量作为类名? [英] Using Variables for Class Names in Python?

问题描述

我想知道如何在Python中将变量用于对象和函数名称.在PHP中，您可以执行以下操作:

I want to know how to use variables for objects and function names in Python. In PHP, you can do this:

$className = "MyClass";

$newObject = new $className();

您如何在Python中执行此类操作?还是我完全不了解Python的一些根本区别，如果是，那是什么?

How do you do this sort of thing in Python? Or, am I totally not appreciating some fundamental difference with Python, and if so, what is it?

推荐答案

在Python中，

className = MyClass
newObject = className()

第一行使变量className与MyClass相同.然后，下一行通过className变量调用MyClass构造函数.

The first line makes the variable className refer to the same thing as MyClass. Then the next line calls the MyClass constructor through the className variable.

作为一个具体示例:

>>> className = list
>>> newObject = className()
>>> newObject
[]

(在Python中，list是list类的构造函数.)

(In Python, list is the constructor for the list class.)

区别在于，在PHP中，您将要引用的类的名称表示为字符串，而在Python中，您可以直接引用相同的类.如果必须使用字符串(例如，如果类的名称是动态创建的)，则将需要使用其他技术.

The difference is that in PHP, you represent the name of the class you want to refer to as a string, while in Python you can reference the same class directly. If you must use a string (for example if the name of the class is created dynamically), then you will need to use other techniques.

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