Newbie: question regarding references and class relationships

[Terry Jan Reedy]

On 6/10/2013 9:18 AM, Rui Maciel wrote:

> class Model:
>          points = []
>          lines = []

Unless you actually need keep the points and lines ordered by entry 
order, or expect to keep sorting them by whatever, sets may be better 
than lists. Testing that a point or line is in the model will be faster, 
as will deleting one by its identify.