如何从字符串列表中删除单词列表 [英] How to remove list of words from a list of strings

问题描述

很抱歉，这个问题有点令人困惑.这类似于此问题

Sorry if the question is bit confusing. This is similar to this question

我认为上述问题与我想要的问题很接近，但是在Clojure中.

I think this the above question is close to what I want, but in Clojure.

还有另一个问题

我需要类似这样的内容，但不是该问题中的"[br]"，而是需要搜索和删除的字符串列表.

I need something like this but instead of '[br]' in that question, there is a list of strings that need to be searched and removed.

希望我能说清楚.

我认为这是由于python中的字符串是不可变的.

I think that this is due to the fact that strings in python are immutable.

我有一个需要从字符串列表中删除的干扰词列表.

I have a list of noise words that need to be removed from a list of strings.

如果我使用列表推导，最终将一次又一次地搜索相同的字符串.因此，仅删除"of"而不删除"the".所以我的修改后的列表看起来像这样

If I use the list comprehension, I end up searching the same string again and again. So, only "of" gets removed and not "the". So my modified list looks like this

places = ['New York', 'the New York City', 'at Moscow' and many more]

noise_words_list = ['of', 'the', 'in', 'for', 'at']

for place in places:
    stuff = [place.replace(w, "").strip() for w in noise_words_list if place.startswith(w)]

我想知道我在做什么错误.

I would like to know as to what mistake I'm doing.

推荐答案

这是我的选择.这使用正则表达式.

Here is my stab at it. This uses regular expressions.

import re
pattern = re.compile("(of|the|in|for|at)\W", re.I)
phrases = ['of New York', 'of the New York']
map(lambda phrase: pattern.sub("", phrase),  phrases) # ['New York', 'New York']

无人lambda:

[pattern.sub("", phrase) for phrase in phrases]

更新

修复 gnibbler 指出的错误(谢谢！):

Fix for the bug pointed out by gnibbler (thanks!):

pattern = re.compile("\\b(of|the|in|for|at)\\W", re.I)
phrases = ['of New York', 'of the New York', 'Spain has rain']
[pattern.sub("", phrase) for phrase in phrases] # ['New York', 'New York', 'Spain has rain']

@prabhu:以上更改避免了从西班牙"中截取尾随的" in ".要验证是否对短语西班牙有雨"运行两个版本的正则表达式.

@prabhu: the above change avoids snipping off the trailing "in" from "Spain". To verify run both versions of the regular expressions against the phrase "Spain has rain".

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