[Python-Dev] (no subject) (original) (raw)

Greg Ewing greg.ewing at canterbury.ac.nz
Tue Feb 10 07:04:03 CET 2015

Donald Stufft wrote:

perhaps a better solution is to simply make it so that something like ``alist + aniterable`` is valid and the iterable would just be consumed and +’d onto the list.

I don't think I like the asymmetry that this would introduce into + on lists. Currently

[1, 2, 3] + (4, 5, 6)

is an error because it's not clear whether the programmer intended the result to be a list or a tuple. I think that's a good thing.

Also, it would mean that

[1, 2, 3] + foo == [1, 2, 3, "f", "o", "o"]

which would be surprising and probably not what was intended.

-- Greg

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