使用python查找大文件中最后一次出现的单词 [英] Find the last occurrence of a word in a large file with python

问题描述

我有一个非常大的文本文件.我想搜索特定单词的最后一次出现，然后对它后面的行执行某些操作.

I have a very large text file. I want to search for the last occurrence of a specific word and then perform certain operations on the lines that follows it.

我可以这样做:

if "word" in line.split():
    do something

不过，我只对 "word" 最后一次出现感兴趣.

I am only interested in the last occurrence of "word" however.

推荐答案

一个更简单快捷的解决方案是以相反的顺序打开文件，然后搜索第一个单词的位置.

Well an easier and quicker solution would be to open the file in reversed order and then searching the first word location.

在 python 2.6 中，您可以执行类似操作(其中 word 是您要查找的字符串)

In python 2.6 you can do something like (where word is string you are looking for)

for line in reversed(open("filename").readlines()):
    if word in line:
    # Do the operations here when you find the line

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