将kwargs转换为变量? [英] Converting kwargs into variables?

问题描述

如何将kwargs对象转换为局部变量?我是一名数学老师，我想编写一个辅助函数，可以在其中使用JS样式的模板字符串编写问题.

How do I convert kwargs objects into local variables? I am a math teacher and I want to write a helper function where I can use JS-style template strings to write problems.

我想做这样的事情:

TemplateString('{{a*b}} apples are shared among {{a}} children. How many apples do each child get?', {'a': 3, 'b': 5})
//return '15 apples are shared among 3 children...'

我将在字符串中搜索"{{}}"，然后在其中的内容上调用eval().但是首先我需要将{'a':3，'b':5}转换为局部变量a = 3和b = 5.变量可以是int，float或str.最好的方法是什么?

I am going to search for '{{}}' in strings and call eval() on what is inside that. But first I need to convert {'a': 3, 'b': 5} into local variables a=3 and b=5. The variables could be int, float or str. What is the best way to do this?

推荐答案

如果您打算使用 eval ，则根本不需要将其转换为本地语言. eval 需要可选的 globals 和/或 locals 自变量，用于定义该表达式的活动范围变量.如果您提供 globals (第二个位置参数)而不提供 locals (第三个位置)，那么 globals 将被重新用作 locals ，例如:

If you're planning to use eval, you don't need to convert them to locals at all. eval takes optional globals and/or locals arguments that defines the active scope variables for that expression. If you provide globals (the second positional argument) and not locals (the third), then globals is reused as locals, so for example:

>>> eval('a * b', {'a': 5, 'b': 3})
15

这篇关于将kwargs转换为变量?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！