unable to construct tuple with one item

[MRAB]

On May 6, 4:04 pm, Mel Wilson <mwil... at the-wire.com> wrote:
> Vyacheslav Maslov wrote:
> > So, the main question is why using syntax like [X] python constuct list
> > with
> > one item, but when i try to construct tuple with one item using similar
> > syntax (X) python do nothing?
>
> Because `(` and  `)` are used in expressions to bracket sub-expressions.
>
> a = (4 + 3) * 2
>
> means: add 4 to 3, multiply the sum by 2.  It can't mean: make a tuple
> containing 7 and extend it to 7,7 .
>
> The real constructor for tuples is `,`.  When you see parens around
> tuple creation they're there to bracket the sub-expression that
> creates the tuple.  You see new tuples without parens all the time:
>
> for i, thing in enumerate (things): ...
>
> starter, main_course, dessert, beverage = order_meal (*hunger)
>
> etc.
>
>         Mel.
>
If it's the comma that makes the tuple, then wouldn't [1, 2] make a 2-
tuple in a list, ie == [(1, 2)]? Hmm...