Gordon McMillan wrote:
>
> Fred L. Drake, Jr. writes:
> > Greg Stein writes:
> > > p.s. I'm against a ternary operator. use an if/else statement. use
> > > def instead of lambda (lambda is the only rational basis given so far to
> > > add the operator, but it is bogus to start with)
> >
> > Actually, the places I'd use it most would be probably be in
> > constructing parameters to string formatting operations. Grepping
> > back in my memory, that's usually where I've wanted it.
>
> Boy does that ring a big bell. Was ambivalent, now I'm all for it
> (either C syntax or "then" syntax, don't care).
So am I! Conditional expressions make very much sense for
constructing objects on-the-fly. It is quite common to
denote tuples, lists and dicts directly in Python code,
like so:
mapping_table = {
1: "one",
2: "two",
}
and so on. To parameterise them, we can either use different tables
embedded in an if, or use an expression inside the denotation:
language = 1
mapping_table = {
1: ("one", "eins")[language],
2: ("two", "zwei")[language],
}
but with expressions, we get to
mapping_table = {
1: language == 0 ? "one" : "eins",
2: language == 0 ? "two" : "zwei",
}
Well, maybe I had better chosen a different example, since the
language example looks better with indexing here.
How would we spell an elif? Would we at all?
# languages: 0 - English 1 - German 2 - Finnish
mapping_table = {
1: language == 0 ? "one" : language == 1 ? "eins", "yksi",
2: language == 0 ? "two" : language == 2 ? "zwei", "kaksi",
3: language == 0 ? "three" : language == 2 ? "drei", "kolme",
}
(yes the zero slot is missing - forgot what that is in Finnish:)
Would conditionals also be valid on the LHS of assignments?
target ? a : b = language ? "one" : "eins"
grmbl - chris
--
Christian Tismer :^) <mailto:tismer@appliedbiometrics.com>
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