Writing a list to a file with Python, with newlines

Question

How do I write a list to a file? writelines() doesn't insert newline characters, so I need to do:

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

Answer 1

Use a loop:

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

For Python <3.6:

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

For Python 2, one may also use:

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

If you're keen on a single function call, at least remove the square brackets [], so that the strings to be printed get made one at a time (a genexp rather than a listcomp) -- no reason to take up all the memory required to materialize the whole list of strings.