On 3/8/2017 5:43 PM, Chris Angelico wrote:
On Thu, Mar 9, 2017 at 9:39 AM, Brice PARENT <cont...@brice.xyz> wrote:
But a possible workaround, is if we used the first positional argument of
dict() as the default value. As right now it doesn't accept positional
arguments (or at least if they are not iterable, which complicates a bit the
thing), we could allow a syntax like :
d = dict([default, ][*args, ]**kwargs)
where default is a callable, *args made of iterables, and kwargs any kwargs.
There'd still be a pile of special cases. Granted, there aren't going
to be very many objects that are both callable and iterable, but there
certainly _can be_, and if one were passed as the first argument, it
would be ambiguous.
Safer to keep this out of the signature of dict itself.
If we really want to make defaultdict feel more "builtin" (and I don't
see any reason to do so), I'd suggest adding a factory function:
dict.defaultdict(int)
Similar in spirit to dict.fromkeys(), except of course returning a
defauldict, not a dict.
Eric.
_______________________________________________
Python-ideas mailing list
Python-ideas@python.org
https://mail.python.org/mailman/listinfo/python-ideas
Code of Conduct: http://python.org/psf/codeofconduct/
