如何通过检查字典中是否存在另一个单词列表来过滤字典列表？答案

【问题标题】：How to filter a list of dictionaries by checking if another list of words are existed in those dictionaries?如何通过检查字典中是否存在另一个单词列表来过滤字典列表？
【发布时间】：2020-07-21 09:43:38
【问题描述】：

您好，我有一个字典列表，我想检查这些字典中是否包含单词列表中的特定单词，我想匹配确切的单词例如，如果有一个名为 'badest' 的单词，我想匹配单词 'bad' 我不想包含它，这就是我使用正则表达式的原因在这里，我已经做到了，但我只是想知道是否有更好、更易读的方法来做到这一点。

这是我的代码：

import re


words = ['bad', 'sad']


books = [

 {
    'title': 'bad book',
    'description': 'this book contains bad text'
},

{
    'title': 'book two',
    'description': 'this book also contains Bad text'
},

{
    'title': 'good book',
    'description': 'this book will help you to overcome baddest habits'
},
{

    'title': 'book four',
    'description': 'this book is about a sad story'
}
 ]


 def filter_books(book):

    if not any(re.search(rf'\b{word}\b', book['title'], flags=re.IGNORECASE)
           or re.search(rf'\b{word}\b', book['description'], flags=re.IGNORECASE)
           for word in words):
      return True

  return False


  good_books = list(filter(filter_books, books))


  print(good_books)

【问题讨论】：

标签： python python-3.x regex list filter

【解决方案1】：

import re

words = ['bad', 'sad']

books = [

    {
        'title': 'bad book',
        'description': 'this book contains bad text'
    },

    {
        'title': 'book two',
        'description': 'this book also contains Bad text'
    },

    {
        'title': 'good book',
        'description': 'this book will help you to overcome baddest habits'
    },
    {

        'title': 'book four',
        'description': 'this book is about a sad story'
    }
]


def is_word_present(word):
    for w in words:
        if (re.search(rf'\b{w}\b', word, flags=re.IGNORECASE)):
            return True
    return False


def _filter(books):
    res = []
    for book in books:
        if is_word_present(book['title']) or is_word_present(book['description']):
            pass
        else:
            res.append(book)
    return res


good_books = _filter(books)
print(good_books)

【讨论】：

【解决方案2】：

你可以使用类似的东西：

def filter(book):
    result = False
    all = book['title'] + ' ' + book['description']
    for item in words:
        if item in re.split(pattern='.| |,|;', string=all):
            result = True
    return result

这会检查您的words 列表中的单词之一是否在标题或描述中。一件坏事：这是区分大小写的。

【讨论】：

【解决方案3】：

这里有几种方法，

# using set data-structure

words = {'bad', 'sad'}

# 6.99 µs ± 426 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
print([
    book for book in books
    if set(book['title'].lower().split()).intersection(words)
       or set(book['description'].lower().split()).intersection(words)
])

# using regex

import re

words = re.compile("|".join(words), re.IGNORECASE)

# 11 µs ± 874 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
print([
    book for book in books
    if words.findall(book['title'])
       or words.findall(book['description'])
])

【讨论】：