在 Python 中将函数传递给 re.sub [英] Passing a function to re.sub in Python

问题描述

我的字符串中某处包含一个数字，我试图用它们的文字符号(即 3 -> 3)替换这个数字.我有一个功能可以做到这一点.现在的问题是找到字符串中的数字，同时保持字符串的其余部分完好无损.为此，我选择使用 re.sub 函数，它可以接受可调用".但是，传递给它的对象是内部 _sre.SRE_Match 并且我不确定如何处理它.我的函数接受数字或其字符串表示.

I have strings that contain a number somewhere in them and I'm trying to replace this number with their word notation (ie. 3 -> three). I have a function that does this. The problem now is finding the number inside the string, while keeping the rest of the string intact. For this, I opted to use the re.sub function, which can accept a "callable". However, the object passed to it is the internal _sre.SRE_Match and I'm not sure how to handle it. My function accepts a number or its string representation.

我应该如何编写一些辅助函数来桥接 re.sub 调用与我的函数执行所需的处理?或者，有没有更好的方法来做我想做的事?

How should I write some helper function which can be used to bridge the re.sub call with my function doing the required processing? Alternatively, is there a better way to do what I want?

推荐答案

你应该调用 group() 来获取匹配的字符串:

You should call group() to get the matching string:

import re

number_mapping = {'1': 'one',
                  '2': 'two',
                  '3': 'three'}
s = "1 testing 2 3"

print re.sub(r'\d', lambda x: number_mapping[x.group()], s)

印刷品:

one testing two three

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