Replace text from file for each lines

Question

I want to add new string to all line in a text file.

I have written this program so far:

with open("texte.txt", mode="r") as mf:
    for line in mf:
        data = line + '"'
        print(data) 

But when I print the content, I get an output like this:

line
"
line2
"
line3
"
line"

So I can see it's my first line from my text which is printed OK.

I want my output to be like this:

line1"
line2"
line3"

Thanks for your assistance, I hope you understand me

Answer 1

Each line in a file ends with a line feed. You have to strip that character out of the read input before you're ready to work with the remaining string:

data = line.rstrip() + '"'

Answer 2

Use the splitlines() method:

with open("texte.txt", mode="r") as mf:
    lines = mf.read().splitlines()
    for line in lines:
        data = line + '"'
        print(data)