conditional expressions
thp at cs.ucr.edu
thp at cs.ucr.edu
Sun Sep 22 22:13:55 EDT 2002
Terry Reedy <tjreedy at udel.edu> wrote:
+ "daniel w. moore" <dan65536 at hotmail.com> wrote in message
+ news:33b491f.0209181820.17b6ea70 at posting.google.com...
+> It's occurred to me after some brainstorming on the subject that the
+> C/perl construct
+>
+> a ? b : c
+>
+> can be arranged like this in python:
+>
+> (a and [b] or [c])[0]
+ If you *know* that b will evaluate as True (perhaps because it is a
+ non-null constant, then this can be simplified to 'a and b or c'. I
+ first used this several years ago.
But why use grotesque hacks in the first place? "a ? b : c" is a
well-established syntax for conditional expressions. Why doesn't
Python simply adopt it?
Tom Payne
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