Writing String to a File on a New Line Every Time

Writing string to a file on a new line every time

Use "\n":

file.write("My String\n")

See the Python manual for reference.

I can't add a new line when writing a file in Python

I think what you want is appending to the file, instead of writing (truncating the file if it already exists):

    # ...

    else:
        taken.append(file_name)
        file = open('logs.txt', 'a+')  # 'a+' mode instead of 'w' mode
        file.write(file_name + '\n')
        file.close()
    # ...

Refer to document.

Write a new line of code every time the program enters a new string to the file C#

There is a method AppendAllText() rather than WriteAllText(), as below:

File.AppendAllText(@"c:\Path\filename.txt", "the text to append" + Environment.NewLine);

Write newline character explicitly in a file

Just replace the newline character with an escaped new line character

text = "where are you going?\nI am going to the Market?"
with open("output.txt",'w', encoding="utf-8") as output:
    output.write(text.replace('\n','\\n'))

How can I make a line break when writing a string to a file?

Windows and Linux line breaks are different. Try to write \r\n.

EDIT

If you use System.lineSeparator() to get line break it will give platform based line break. So if you create a file on unix and send it to windows users they will see that file like one line. But if you are using windows os to create file, linux users will see file correct.

How can i print a new line in a text file, each time i press a button?

Use this overload of the StreamWriter constructor.

    using (StreamWriter writer = new StreamWriter(path, append: true))
    {
        writer.WriteLine(username + ' ' + password);
    }

Python Writing huge string in text file with a new line character every 240 characters

In that case, you can just do

html = "..."
i = 100
while i < len(html):
    html = html[:i] + "\n" + html[i:]
    i += 101

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