On Tue, Oct 31, 2017 at 10:31:50AM +0000, אלעזר wrote:
> Off topic: why can't we simply allow something like this:
>
> (the_bob) = (name for name in ('bob','fred') if name=='bob')
Parens don't make a tuple. They are just for grouping. If you want a
tuple, you need a comma:
the_bob, = ...
with or without the parens. It would be terribly surprising if (x) was a
sequence on the left hand side but not on the right hand side of an
assignment.
> Why does Python treat the parenthesis at the LHS as grouping parens?
> operators are not allowed anyway; (a + (b + c)) = [1] is syntax error.
a, (b, c), d = [1, "xy", 2]
> Currently
>
> (x) = 1
>
> works, but I can't see why should it.
Why shouldn't it?
Its just a trivial case of the fact that the left hand side can be
certain kinds of expressions, some of which require parens:
(spam or ham)[x] = value
There are lots of possible expressions allowed on the LHS, and no good
reason to prohibit (x) even though its pointless.
--
Steve
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