Newbie: question regarding references and class relationships
Roy Smith
roy at panix.com
Mon Jun 10 09:35:43 EDT 2013
In article <kp4jf4$5fu$1 at dont-email.me>,
Rui Maciel <rui.maciel at gmail.com> wrote:
> Essentially, a Model object stores lists of Point objects and Line objects,
> and Line objects include references to Point objects which represent the
> starting and ending point of a line.
>
> class Point:
> position = []
>
> def __init__(self, x, y, z = 0):
> self.position = [x, y, z]
>
> class Line:
> points = ()
> def __init__(self, p_i, p_f):
> self.points = (p_i, p_f)
>
> class Model:
> points = []
> lines = []
>
>
> It would be nice if, whenever a Point object was updated, the Line objects
> which are associated with it could reflect those updates directly in
> Line.p_i and Line.p_f.
Have you tried running the code you wrote? It does that already! When
you do something like:
my_list = [obj1, obj2]
in Python, the objects are stored by reference (not just lists, all
assignments are by reference).
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