from collections import namedtuple
Point = namedtuple('Point', 'x, y')
POINTS = (
Point(610, 102),
Point(253, 241),
Point(341, 446),
Point(357, 42),
Point(153 ,336),
Point(203, 125),
Point(306, 492),
Point(335, 57),
Point(38, 400),
Point(191, 357),
# and many, many more points.
)
print POINTS
##
## Ok, we decided 3D is way cooler.
## But only a few points have a z coordinate != 0.
##
Point = namedtuple('Point', 'x, y z')
##
## The solution is quite simple.
## Our on-the-fly partial adapter!
##
from functools import partial
Point = partial(Point, z = 0)
POINTS = (
Point(610, 102),
Point(253, 241),
Point(341, 446, z = 23),
# But, however, our defaults have to be specified as keyword arguments.
# Otherwise we got a complaint:
# TypeError: __new__() got multiple values for keyword argument 'z'
Point(357, 42),
Point(153 ,336, z = 11),
Point(203, 125),
Point(306, 492, z = 42),
Point(335, 57),
Point(38, 400, z = 47),
Point(191, 357),
)
print POINTS
