How to Efficiently Write a List to a File with Newlines in Python?

Writing a List to a File with Newlines in Python

To write a list to a file with newlines, the writelines() method is often used. However, this method does not automatically insert newline characters. A workaround is to loop through the list and write each line individually.

Alternative Loop-Based Approach

A more straightforward approach is to use a loop with the write() method. This will ensure that newline characters are inserted between each line.

with open('your_file.txt', 'w') as f:
    for line in lines:
        f.write(f"{line}\n")

For Python < 3.6

In older versions of Python (before 3.6), the following loop can be used:

with open('your_file.txt', 'w') as f:
    for line in lines:
        f.write("%s\n" % line)

For Python 2

In Python 2, the print statement can be used to write lines to a file:

with open('your_file.txt', 'w') as f:
    for line in lines:
        print >> f, line<p><strong>Efficient Function Call</strong></p>
<p>If a single function call is preferred, the square brackets [] can be removed from the writelines() method. This will result in a more efficient operation, as the strings will be generated one by one instead of being materialized into a list first.</p>
<pre class="brush:php;toolbar:false">f.writelines(f"{line}\n" for line in lines)

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