In creating a class I can set some default values:
class Point:
def __init__(self, x, y, z=0):
self.x = x
self.y = y
self.z = z
How to proceed in the same way for namedtuple?
from collection import namedtuple
Point = namedtuple('Point', 'x, y, z')
Subclass the result of namedtuple and rewrite the value of __new__ as follows:
from collections import namedtuple
class Move(namedtuple('Point', 'x, y, z')):
def __new__(nome, piece, start, to, captured=None, promotion=None):
# adicionar valores padrao
return super(Point, nome).__new__(nome, x, y, z=0)
In python3 use .__new__.__defaults__ to assign default values.
Points = namedtuple('Points', 'x y z')
Points.__new__.__defaults__ = (None,None,'Foo')
Points()
Points(x=None, y=None, z='Foo')