Method default argument whose type is the class not yet defined
Roy Smith
roy at panix.com
Sun Nov 11 03:53:42 CET 2012
In article <mailman.3549.1352601828.27098.python-list at python.org>,
Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Sat, Nov 10, 2012 at 7:13 PM, Chris Angelico <rosuav at gmail.com> wrote:
> > I would not assume that. The origin is a point, just like any other.
> > With a Line class, you could deem a zero-length line to be like a
> > zero-element list, but Point(0,0) is more like the tuple (0,0) which
> > is definitely True.
>
> It's more like the number 0 than the tuple (0,0).
>
> 0 is the origin on a 1-dimensional number line.
> (0,0) is the origin on a 2-dimensional number plane.
> In fact, it might be pointed out that Point(0, 0) is a generalization
> of 0+0j, which is equal to 0.
If (0,0) is the origin on a plane, then (0,) should be the origin on a
line. If you consider 0 + 0j to be the origin of a plane, then 0 is the
origin of a line. Either way is plausible, but you need to be
consistent.
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