[Python-ideas] Fwd: Fwd: unpacking generalisations for list comprehension

[אלעזר]

On Sat, Oct 15, 2016 at 8:36 PM Chris Angelico <rosuav at gmail.com> wrote:

> On Sun, Oct 16, 2016 at 4:33 AM, אלעזר <elazarg at gmail.com> wrote:
> > You are confusing here two distinct roles of the parenthesis:
> disambiguation
> > as in "(1 + 2) * 2", and tuple construction as in (1, 2, 3). This
> overload
> > is the reason that (1) is not a 1-tuple and we must write (1,).
>
> Parentheses do not a tuple make. Commas do.
>
> 1, 2, 3, # three-element tuple
> 1, 2, # two-element tuple
> 1, # one-element tuple
>
> And what [1, 2, 3] means? It's very different from [(1,2,3)].

Python explicitly allow 1, 2, 3 to mean tuple in certain contexts, I agree.

Elazar
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