Armin Rigo <arigo@tunes.org> writes:
> This goes against the initial proposal, which was to have a
> lightweight and declaration-less way to build structures.
Yes. I never had the need for a lightweight and declaration-less way
to build structures. What is the need?
> point = {'x': 5, 'y': 6}
> print point['x']
> print point['y']
>
> which looks reasonably if not quite entierely nice.
If looking reasonable, or even nice, is the goal, why not write
class Point:
def __init__(self, x, y):
self.x, self.y = x, y
point = Point(5, 6)
#or
point = Point(x=5, x=6)
print point.x
print point.y
> The problem is that it is incompatible with tuples: you cannot
> smoothly go from tuples to dicts without changing your whole
> program.
So you need to enhance class Point
def __getitem__(self, index):
if index == 0:return self.x
if index == 1:return self.y
raise IndexError
> What about just allowing keyword parameters in 'tuple'?
>
> point = tuple(5, 6, color=RED, visible=False)
I have to problems imagining such an extension:
1. I'm not sure this would be useful.
2. I can't imagine how to implement it, without compromising performance
for tuples.
3. It can be easily implemented without any change to builtin types:
class Tuple(tuple):
pass
def TUPLE(*args, **kw):
res = Tuple(args)
res.__dict__=kw
return res
point = TUPLE(5, 6, color="RED", visible=False)
print point[0]
print point.color
Regards,
Martin
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