[Python-3000] PEP 3101 Updated

[Guido van Rossum]

On 8/22/07, Eric Smith <eric+python-dev at trueblade.com> wrote:
> James Thiele wrote:
> > In the section "Explicit Conversion Flag" of PEP 3101 it says:
> >
> > Currently, two explicit conversion flags are recognized:
> >
> >         !r - convert the value to a string using repr().
> >         !s - convert the value to a string using str().
> > --
> > It does not say what action is taken if an unrecognized explicit
> > conversion flag is found.
>
> My implementation raises a ValueError, which I think is the desired
> behavior:
>
>  >>> "{0!x}".format(1)
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
> ValueError: Unknown converion specifier x

You raise ValueErrors for other errors with the format, right? If
there's a reason to be more lenient, the best approach would probably
be to interpret it as !r.

> I agree the PEP should be explicit about this.

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)