Re: Fixed PL/Python hint about array of composites

On 05/29/2017 07:43 PM, Daniele Varrazzo wrote:
> On Mon, May 29, 2017 at 5:38 PM, Daniele Varrazzo
> <daniele(dot)varrazzo(at)gmail(dot)com> wrote:
>> The error message hint suggests [('foo')]. ('foo') is not a valid
>> Python tuple: it's a literal with redundant parentheses. ('foo',) is a
>> valid tuple.
>>
>> Patch to correct the hints and an occurrence in the test suite attached.

> -HINT: To return a composite type in an array, return the composite type as a Python tuple, e.g. "[('foo')]"
> +HINT: To return a composite type in an array, return the composite type as a Python tuple, e.g. "[('foo',)]".

Huh, that looks weird. Perhaps we should use an example with two-element
tuple in the example, to avoid the awkward trailing comma?

Then again, it's a useful to have it in the example, exactly because
it's not obvious what you need to do with a 1-element tuple. Or maybe
use "[('foo', 'bar',)]" in the example?

Maybe this is well known to all Python programmers, and I'm worrying
about nothing.. I'm not too familiar with Python.

- Heikki