在Python中将数据附加到文本文件的特定行中? [英] appending a data in a specific line of a text file in Python?

问题描述

比方说我有这个文本文件:date.txt.月|日|年

Let's say I have this textfile: date.txt. month|day|year

January|20|2014
February|10|
March|5|2013

我想将2012年2月| 10 |之后.我该怎么办?

I want to put 2012 after February|10|. how can i do that?

推荐答案

您需要将文件读入内存，修改所需的行并写回文件.

You need to read the file into memory, modify the desired line and write back the file.

temp = open('temp', 'wb')
with open('date.txt', 'r') as f:
    for line in f:
        if line.startswith('February'):
            line = line.strip() + '2012\n'
        temp.write(line)
temp.close()
shutils.move('temp', 'data.txt')

如果您不想使用临时文件:

If you don't want to use a temporary file:

with open('date.txt', 'r+') as f: #r+ does the work of rw
    lines = f.readlines()
    for i, line in enumerate(lines):
        if line.startswith('February'):
            lines[i] = lines[i].strip() + '2012\n'
    f.seek(0)
    for line in lines:
        f.write(line)

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