下面是我正在使用的文本文件的示例:
437868313,2436413,Wyatt,Trenton,08/21/2003,211000010262002,211000010262002,2014,01,54435A000,510,Social Studies (Grade 5),08/14/2013,5-2,02,0,02,02,01,,,,,,100,05/29/2014,
437868313,2436413,Wyatt,Trenton,08/21/2003,211000010262002,211000010262002,2014,01,53235A000,500,Science (Grade 5),08/14/2013,5-2,02,0,02,02,01,,,,,,100,05/29/2014,
437868313,2436413,Wyatt,Trenton,08/21/2003,211000010262002,211000010262002,2014,01,58035A000,560,Physical Education (Grade 5),08/14/2013,5-2,02,0,02,02,01,,,,,,1,05/29/2014,
我试着在每隔一行的末尾加上一个字母"S"。所以,上面总共有3条记录。就在2014年5月29日之后,我想插入S。所以每条记录看起来都是这样的:
437868313,2436413,Wyatt,Trenton,08/21/2003,211000010262002,211000010262002,2014,01,54435A000,510,Social Studies (Grade 5),08/14/2013,5-2,02,0,02,02,01,,,,,,100,05/29/2014,S
我意识到这将是非常简单的转换为CSV并使用excel,但我在传输回txt时遇到了各种格式问题。想用蟒蛇试试。我正在尝试使用append,据我所知,write将覆盖我现有的文件:
myFile = open("myFile.txt", "a")
for line in myFile:
myFile.write('S')
我不经常使用python,我想知道如何对它进行索引,使它从第2行开始,并在逗号后面添加行的末尾,就像我上面提到的那样。
您需要逐行读取文件,然后再次逐行输出。这比使用CSV甚至电子表格处理软件要简单得多,这真的让我害怕。
with open('input.txt', 'r') as istr:
with open('output.txt', 'w') as ostr:
for i, line in enumerate(istr):
# Get rid of the trailing newline (if any).
line = line.rstrip('n')
if i % 2 == 0:
line += 'S'
print(line, file=ostr)
如果您仍在使用Python 2,请使用
ostr.write(line + 'n')
而不是CCD_ 1。
更新:如果您想每隔(而不是每隔一行)追加到,只需使用:
with open('input.txt', 'r') as istr:
with open('output.txt', 'w') as ostr:
for line in istr:
line = line.rstrip('n') + 'S'
print(line, file=ostr)
打开一个用于读取和写入的文件,并枚举输入文件。使用mod 2确定偶数行。将s附加到偶数行,然后写入输出文件。
with open('myfile.txt', 'rb') as infile, with open('outfile.txt', 'wb') as outfile:
for lineno, line in enumerate(infile):
if lineno % 2 == 0:
line = line + 'S'
outfile.write(line)
OP希望每个记录都符合他的编辑,所以不需要测试偶数行。
import os
with open('myfile.txt', 'rb') as infile, with open('outfile.txt', 'wb') as outfile:
for line in infile:
line = line.replace(os.linesep, 'S' + os.linesep)
outfile.write(line)
试试这个:
filename = "file.txt"
file = open(filename, "r")
for line in file:
print line.replace("n","Sn")
最简单的方法是将文件作为一个块打开,并将逗号和换行符替换为,S表示逗号和换行。
open("data.txt").read().replace(',n','S,n').write()
试试这个:
myFile = open("myFile.txt", "a")
Colist = str(myFile.read()).split('n')
for line in Colist:
myFile.write(line + 'S' + 'n')