How to Filter List Elements by Keywords in Python: Two Simple Methods

Introduction

A fan asked how to filter a list of titles so that only those containing both "python" and "应用" (application) remain. The issue arises because the titles are stored as nested lists, requiring an extra extraction step.

Method 1: Regular reading

# -*- coding: utf-8 -*-
keywordlist = ['python', '应用']
title = [['人生苦短，我应用python'], ['Rick Xiang 666'], ['歪歪nb'], ['为才哥打call'], ['网络爬虫的应用']]
for luwen in title:
    if keywordlist[0] in luwen[0] and keywordlist[1] in luwen[0]:
        print(luwen)

Running the code prints the matching sub‑list:

Method 2: Using the operator library

# -*- coding: utf-8 -*-
import operator
keywordlist = ['python', '应用']
title = [['人生苦短，我应用python'], ['Rick Xiang 666'], ['歪歪nb'], ['为才哥打call'], ['网络爬虫的应用'], ['python爬虫与数据挖掘']]
for luwen in title:
    if operator.contains(luwen[0], keywordlist[0]) and operator.contains(luwen[0], keywordlist[1]):
        print(luwen)

The execution yields the matching entry as shown:

Conclusion

The two approaches successfully locate list elements that contain the required keywords. While the article demonstrates only these two methods, other techniques are possible, and readers are encouraged to experiment further.