else on the same line - howto

[Terry Reedy]

"Helmut Jarausch" <jarausch at remove.igpm.rwth-aachen.de> wrote in
message news:bmj859$iph$1 at nets3.rz.RWTH-Aachen.DE...
> Since Python lacks conditional expression
> like
>
> k+= (dy >= 0 ? 1 : -1)

For this specific example:

k+= (dy >= 0 and 1 or -1)

But don't do this unless and until you 1) understand why this works
and why the and branch must be non-null and what happens if it is null
(this is discussed both in the FAQ and PEP 308) AND 2) accept
responsibility for always remembering the caution.

Terry J. Reedy