Changing format of output text file

Question

I have a text file like this:-

V1xx AB1
V2xx AC34
V3xx AB1

Can we add ; at each end of line through python script?

V1xx AB1;
V2xx AC34;
V3xx AB1;

Do you want to create a new file, or write it to existing file? — Rohit Jain
– Rohit Jain, Commented Oct 16, 2012 at 22:16
Yes, it's trivial to add a semicolon to each line and write it to a new file. What part are you having trouble with? — Mark Ransom
– Mark Ransom, Commented Oct 16, 2012 at 22:25
What problem are you facing? You can iterate over all lines, add a ; to them and append to a new file? — Rohit Jain
– Rohit Jain, Commented Oct 16, 2012 at 22:34

Rohit Jain · Accepted Answer · 2012-10-16 22:50:47Z

1

Here's what you can try. I have overwritten the same file though.

You can try creating a new one(I leave it to you) - You'll need to modify your with statement a little : -

lines = ""

with open('D:\File.txt') as file:
    for line in file:
        lines += line.strip() + ";\n"

file = open('D:\File.txt', "w+")
file.writelines(lines)

file.flush()

UPDATE: - For in-place modification of file, you can use fileinput module: -

import fileinput

for line in fileinput.input('D:\File.txt', inplace = True):
    print line.strip() + ";"

edited Oct 16, 2012 at 22:50

answered Oct 16, 2012 at 22:35

Rohit Jain

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3 Comments

iruvar Over a year ago

Fileinput module supports in-place modification of file allthough appears that the OP is looking to have things served up on a platter

Rohit Jain Over a year ago

@cravoori Thanks for the information. Can you take a look at my added code. Is it correct way of doing it?

Sudha Verma Over a year ago

Thanks, it works. I was using perl and that too worked as well.

martineau · Accepted Answer · 2013-12-21 10:33:06Z

1

input_file_name = 'input.txt'
output_file_name = 'output.txt'

with open(input_file_name, 'rt') as input, open(output_file_name, 'wt') as output:
    for line in input:
        output.write(line[:-1]+';\n')

edited Dec 21, 2013 at 10:33

answered Oct 16, 2012 at 22:40

martineau

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Comments

Dlinet · Accepted Answer · 2012-10-16 22:34:08Z

0

#Open the original file, and create a blank file in write mode
File     = open("D:\myfilepath\myfile.txt")
FileCopy = open("D:\myfilepath\myfile_Copy.txt","w")

#For each line in the file, remove the end line character,
#insert a semicolon, and then add a new end line character.
#copy these lines into the blank file
for line in File:
    CleanLine=line.strip("\n")
    FileCopy.write(CleanLine+";\n")
FileCopy.close()
File.close()

#Replace the original file with the copied file
File = open("D:\myfilepath\myfile.txt","w")
FileCopy = open("D:\myfilepath\myfile_Copy.txt")
for line in FileCopy:
    File.write(line)
FileCopy.close()
File.close()

Notes: I have left the "copy file" in there as a back up. You can manually delete it or use os.remove() (if you do that don't forget to import the os module)

answered Oct 16, 2012 at 22:34

Dlinet

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1 Comment

Sudha Verma Over a year ago

Thanks, it works. I was using perl and that too worked as well.

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