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Tue Feb 10 06:47:19 CET 2015 · https://mail.python.org/pipermail/python-dev/2015-February/138105.html

Donald Stufft wrote:
> 
> why is:
> 
> print(*[1], *[2], 3) better than print(*[1] + [2] + [3])?

It could potentially be a little more efficient by
eliminating the construction of an intermediate list.

> defining + or | or some other symbol for something similar 
> to [1] + [2] but for dictionaries. This would mean that you could simply do:
> 
> func(**dict1 | dict(y=1) | dict2)

Same again, multiple ** avoids construction of an
itermediate dict.

-- 
Greg

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