How to generate "a, b, c, and d"?

[Ian Kelly]

On Thu, Dec 15, 2011 at 11:51 AM, Tim Chase
<python.list at tim.thechases.com> wrote:
> For the fun/challenge?  Because you have a REALLY big data source that you
> don't want to keep in memory (in addition the resulting string)?

If you have that much data, then I question why you would want to
build such a large human-readable list in the first place.  Nobody is
going to want to read that no matter how you format it.