>>> len(Undef)
TypeError: len() takes exactly one argument (0 given)
since len takes no default values. But if Undef is considered to be an
actual object, like any other object, we ought to get this:
JavaScript and R, for example, do have a special pseudo-values for "even more missing". In JS, it is null vs undefined. In R, it is... well, actually NULL vs. NA vs. NaN. E.g.:
> c(NULL, NA, NaN, 0, "")
[1] NA "NaN" "0" ""
The NULL is a syntactic placeholder, but it's not a value, even a sentinel (i.e. it doesn't get in the array). Python *could* do that. But it would require very big changes in many corners of the language, for no significant benefit I can see.
In other words, I agree with Steven.
The dead increasingly dominate and strangle both the living and the
not-yet born. Vampiric capital and undead corporate persons abuse
the lives and control the thoughts of homo faber. Ideas, once born,
become abortifacients against new conceptions.