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

Susan Sarandon
Susan SarandonOriginal
2024-12-13 19:09:11199browse

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

Iterative Approach to Writing a List to a File with Newlines

In Python, the 'writelines()' method doesn't automatically insert newlines when writing a list to a file. To circumvent this issue, an alternative solution is to iterate through the list and write each element with a newline character appended:

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

Prior to Python 3.6, the following syntax was used:

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

Alternatively, for Python 2, the 'print' function can be utilized:

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

While it's possible to perform this task with a single function call, it's recommended to remove the square brackets around the list to ensure that the strings are written sequentially, rather than creating an entire list in memory first.

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