Python中eval的替代方法 [英] Alternative to eval in Python

问题描述

Python eval相当慢.我需要使用逻辑运算符(例如"True或False")评估简单的布尔表达式.我正在对数千行数据进行此操作，并且eval在性能方面是一个巨大的瓶颈.真的很慢.还有其他方法吗?

Python eval is quite slow. I need to evaluate simple boolean expression with logical operators (like "True or False"). I am doing this for thousands of line of data and eval is a huge bottleneck in terms of performance. It's really slow.. Any alternative approaches?

我尝试创建可能的表达式组合及其预期输出的dict，但这确实很丑！！

I tried creating a dict of possible expression combinations and their expected output, but this is really ugly!

此刻我有以下代码:

eval('%s %s %s' % (True, operator, False))

推荐答案

import operator
ops = { 'or': operator.or_, 'and': operator.and_ }
print ops[op](True, False)

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