在每行的开头插入字符串 [英] Insert string at the beginning of each line

问题描述

我如何在文本文件中每行的开头插入一个字符串，我有以下代码:

How can i insert a string at the beginning of each line in a text file, i have the following code:

f = open('./ampo.txt', 'r+')
with open('./ampo.txt') as infile:
    for line in infile:
        f.insert(0, 'EDF ')
f.close

我收到以下错误:

"文件对象没有属性'插入'"

"'file' object has no attribute 'insert'"

请注意，我是一个完整的程序n00b.

Please note that im a complete programming n00b.

推荐答案

Python随附包括电池:

import fileinput
import sys

for line in fileinput.input(['./ampo.txt'], inplace=True):
    sys.stdout.write('EDF {l}'.format(l=line))

与已经发布的解决方案不同，这还保留了文件权限.

Unlike the solutions already posted, this also preserves file permissions.

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