Append Lines to a File

Open existing file, append a single line

You can use File.AppendAllText for that:

File.AppendAllText(@"c:\path\file.txt", "text content" + Environment.NewLine);

How to properly append lines to already existing file

It is because everytime you execute fprintf in "w" mode, the log gets overwritten with the new contents as the file was not opened in the 'append' mode but in 'write' mode.

Better thing would be to use:

fopen("filename", "a");

Append String to each line of .txt file in python?

You can read the lines and put them in a list. Then you open the same file with write mode and write each line with the string you want to append.

filepath = "hole.txt"
with open(filepath) as fp:
    lines = fp.read().splitlines()
with open(filepath, "w") as fp:
    for line in lines:
        print(line + "#", file=fp)

How do I append text to a file with python?

For Append File:

with open("newfile.txt", "a+") as file:
    file.write("I am adding in more lines\n")
    file.write("And more…")

For Read File:

with open('newfile.txt') as f:
    lines = f.readlines()
     print(lines)

How do I append text to a file?

cat >> filename
This is text, perhaps pasted in from some other source.
Or else entered at the keyboard, doesn't matter. 
^D

Essentially, you can dump any text you want into the file. CTRL-D sends an end-of-file signal, which terminates input and returns you to the shell.

Append lines from a text file to a list in python without '\n'

readlines() puts a newline at the end of every text line. You can use rstrip() to remove it:

f = open('./users/login.txt', 'r+')
f1 = f.readlines()
for ele in f1:
    users.append(ele.rstrip())

Appending Data In a Specific Line of Text in a File Python

You can achieve that by doing this

# define a function so you can re-use it for writing to other specific lines
def writetoendofline(lines, line_no, append_txt):
    lines[line_no] = lines[line_no].replace('\n', '') + append_txt + '\n'

# open the file in read mode to read the current input to memory
with open('./text', 'r') as txtfile:
    lines = txtfile.readlines()

# in your case, write to line number 4 (remember, index is 3 for 4th line)   
writetoendofline(lines, 3, ' 67899')

# write the edited content back to the file
with open('./text', 'w') as txtfile:
    txtfile.writelines(lines)

# close the file
txtfile.close()

---

Related Topics