搜索文本文件并在Python中打印相关行? [英] Search a text file and print related lines in Python?

问题描述

如何在文本文件中搜索关键短语或关键字，然后打印该关键短语或关键字所在的行?

How do I search a text file for a key-phrase or keyword and then print the line that key-phrase or keyword is in?

推荐答案

searchfile = open("file.txt", "r")
for line in searchfile:
    if "searchphrase" in line: print line
searchfile.close()

以简单的方式打印出多行

To print out multiple lines (in a simple way)

f = open("file.txt", "r")
searchlines = f.readlines()
f.close()
for i, line in enumerate(searchlines):
    if "searchphrase" in line: 
        for l in searchlines[i:i+3]: print l,
        print

print l,中的逗号可防止在输出中出现多余的空格；尾随的打印语句将结果划分为不同的行.

The comma in print l, prevents extra spaces from appearing in the output; the trailing print statement demarcates results from different lines.

或更妙的是(从马克·兰森偷走):

Or better yet (stealing back from Mark Ransom):

with open("file.txt", "r") as f:
    searchlines = f.readlines()
for i, line in enumerate(searchlines):
    if "searchphrase" in line: 
        for l in searchlines[i:i+3]: print l,
        print

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