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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Fri, 31 May 2013 09:43:54 -0600
Subject: Re: How clean/elegant is Python's syntax?
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On Thu, May 30, 2013 at 1:38 PM, MRAB <python@mrabarnett.plus.com> wrote:
> And additional argument (pun not intended) for putting sep second is
> that you can give it a default value:
>
>    def join(iterable, sep=""): return sep.join(iterable)

One argument against the default is that it is specific to the str
type.  If you then tried to use join with an iterable of bytes objects
and the default sep argument, you would get a TypeError.  At least not
having the default forces you to be explicit about which string type
you're joining.