如何使用字符串引用类的实例？ [英] How to refer to an instance of a class using a string?

问题描述

我对python有点经验，我一直在搜索和搜索，但是找不到一个有用的答案。

I'm a bit inexperienced with python, and I've been searching and searching but can't find a useful answer to this.

我有实例一个名为tool1，tool2等的类。

I have instances of a class named tool1, tool2, etc.

如何获取由用户输入定义的字符串，并使用它来设置一个变量（current_tool）类的实例？例如：

How do I take a string that is defined by user input and use it to set a variable (current_tool) equal to one of the instances of the class? For example:

tool1 = ...
tool2 = ...

current_tool = 0

my_string = 'tool1'

如何设置current_tool等于到my_string，以便 current_tool = tool1 ？

我本质上是在寻找如何'该字符串使得该字符串只是一段代码。任何使用exec或eval的尝试都没有成功。

I'm essentially looking for how to 'remove' the quotes from the string so that the string is just a piece of code. Any attempts I've made using exec or eval haven't worked.

任何帮助将不胜感激。谢谢。

Any help would be appreciated. Thank you.

推荐答案

使用字典：

tools = {'tool1': ...,
         'tool2': ...}

my_string = 'tool1'
current_tool = tools[my_string]

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