如何使用Python将字符串解释为条件？ [英] How to make a string interpreted as a condition with Python?

问题描述

我需要使用以下语法来过滤列表操作：

I need to use the following syntax to filter the list operations:

a = [ope for ope in operations if ope[0] == 1]

如果语句条件是可变的并且可能包含多个条件：

The if statement condition is variable and may contain multiple conditions:

a = [ope for ope in operations if ope[0] == 1 and ope[1] == "test"]

我使用函数来构建条件并将其作为字符串返回：

I use a function to build the condition and return it as a string:

>>>> c = makeCondition(**{"id": 1, "title": 'test'})
>>>> c
"ope[0] == 1 and ope[1] == 'test'"

有没有办法将 c 变量集成到列表过滤中？这样的事情（当然， c 变量在下面的示例中被评估为字符串）：

Is there a way to integrate the c variable into the list filtering? Something like this (of course, the c variable is evaluated as a string in the below example):

 a = [ope for ope in operations if c]

谢谢帮助！

推荐答案

如评论所述，如果要将字符串更改为表达式，可以使用 eval（string）。

As commented, if you want to change the string to be considered as an expression, you can use eval(string).

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