On Wed, Nov 30, 2016 at 7:09 AM, Ethan Furman <et...@stoneleaf.us> wrote:
> On 11/30/2016 02:32 AM, Jelte Fennema wrote: > > It would be nice to have a supported way to add defaults to namedtuple, >> so the slightly hacky solution here does not have to be used: >> http://stackoverflow.com/a/18348004/2570866 >> > > Actually, the solution right below it is better [1]: > > --> from collections import namedtuple > --> class Node(namedtuple('Node', ['value', 'left', 'right'])): > --> __slots__ = () > --> def __new__(cls, value, left=None, right=None): > --> return super(Node, cls).__new__(cls, value, left, right) > > But even more readable than that is using the NamedTuple class from my > aenum [3] library (and on SO as [3]): > > --> from aenum import NamedTuple > --> class Node(NamedTuple): > --> val = 0 > --> left = 1, 'previous Node', None > --> right = 2, 'next Node', None > > shamelessly-plugging-my-own-solutions'ly yrs, > Ditto: with PEP 526 and the latest typing.py (in 3.6) you will be able to do this: class Employee(NamedTuple): name: str id: int We should make it so that the initial value in the class is used as the default value, too. (Sorry, this syntax still has no room for a docstring per attribute.) -- --Guido van Rossum (python.org/~guido <http://python.org/%7Eguido>)
_______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
