Re: [psycopg] Solving the SQL composition problem

On 01/05/2017 11:26 AM, Daniele Varrazzo wrote:
> On Thu, Jan 5, 2017 at 6:59 PM, Adrian Klaver <adrian.klaver@aklaver.com> wrote:
>
>> Not sure it applies here, but I just ran across a blog from Armin Ronacher.
>> I don't always understand what he says, in this case I think I do and it
>> might be worth a look:
>>
>> http://lucumr.pocoo.org/2016/12/29/careful-with-str-format/
>
> It's a reasonable concern, but no, it doesn't apply to us. From the
> Python library I'm only using the parser to parse the format
> micro-language, but not doing anything special with the field name, in
> particular not applying attribute lookup: trying `{0.__class__}`
> wouldn't try to extract the `__class__` attribute from the first
> positional argument, but would look up for a keyword argument with
> such name and fail with a KeyError. Also, we check and explicitly
> forbid placeholder modifier.
>
> https://github.com/psycopg/psycopg2/blob/a8a3a298/lib/sql.py#L227

Alright, good to know.
>
> -- Daniele
>


--
Adrian Klaver
adrian.klaver@aklaver.com