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Thu Feb 26 20:13:16 EST 2004 · https://mail.python.org/pipermail/python-dev/2004-February/042801.html

> This is a big YES!

Actually, it's a big no.  Alex, immediately and correctly pointed out
that what is needed in a suffix rather than a separator and the way to
get that is with a generator expression:  f.writelines(x+'\n' for x in
mylines).

I had been led astray because I was experimenting with using
cStringIO.writelines() as a basis for implementing str.join() for
general iterables without creating an intermediate tuple.  Right now,
''.join(it) will unexpectedly consume much more memory than really
needed.

Raymond Hettinger

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Optional separatorargument for file.writelines()and StringIO.writelines()