When to use None
aahz at netcom.com
Sun Feb 6 23:15:18 CET 2000
In article <m3wvojx0ie.fsf at atrus.jesus.cam.ac.uk>,
Michael Hudson <mwh21 at cam.ac.uk> wrote:
>I guess the point is that I can't think of a good reason for an object
>to masquerade as None. I generally use None to mean exactly that; a
>void, nothing (like nulls in SQL, I guess).
Yes, exactly (referring to your second sentence). What, then, is the
proper behavior for an object that one wishes to have a null value? It
could be argued that the proper behavior is to change the reference to
None and instantiate a new object whenever there *is* a value, but I
think that's a bit limiting, particularly if one considers such aspects
as efficiency and orthogonal behavior in a list.
This goes double if one wants the *object* to distinguish between zero
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