Method default argument whose type is the class not yet defined

Ian Kelly ian.g.kelly at
Sun Nov 11 03:43:16 CET 2012

On Sat, Nov 10, 2012 at 7:13 PM, Chris Angelico <rosuav at> 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.

More information about the Python-list mailing list