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Fri Feb 27 04:30:33 EST 2004 · https://mail.python.org/pipermail/python-dev/2004-February/042809.html

On Feb 27, 2004, at 4:12 AM, Raymond Hettinger wrote:

> [Bob Ippolito]
>> Currently, it seems that ''.join is faster than cStringIO.writelines
>> anyway, even if you just pass it a big list.
>
> I suspect something wrong with your timing suite.  Under the hood,
> cStringIO.writelines() actually is ''.join().  It appears that the
> whole comparison is circular.

Circular in that "ends up doing approximately the same thing but has a 
lot more overhead" kind of way ;)...  I think the difference is easily 
explained by:
* N calls to join2
* N StringIO()
* N StringIO.writelines
* N StringIO.getvalue
* N StringIO dealloc
* [ probably also memcpy's 2 or 3 times as much ]

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