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

Writing a List to a File: Incorporating Newline Characters with Python

When writing a list to a file using Python, it's important to consider the incorporation of newline characters. The writelines() method does not automatically add newlines, which can lead to a single, continuous string in the file.

To address this, you can employ a loop to write each line individually with a newline character. For Python 3.6 and above, the preferred method is:

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

In Python versions prior to 3.6, you can use:

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

For Python 2, another option is:

with open('your_file.txt', 'w') as f:
    for line in lines:
        print >> f, line

It's recommended to use a single function call for efficiency. However, instead of using square brackets ([]), which create a list, you can use a generator expression to iterate over each string one at a time, saving memory:

f.writelines(f"{line}\n" for line in lines)

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