On 7/1/05, Chinook <[EMAIL PROTECTED]> wrote: > Thank you Andrew, and your elaboration is well taken. I was just > exploring here and the construct you noted is IMHO intuitively readable > - at least for a simple expression and condition. Other than the > choice order [False, True] which seems backward to me.
The choice order is based on the fact that True == 1 and False == 0 (as bool is a subclass of int). Also, I should probably have made the choices a tuple instead of a list, if for no other reason than it's slightly clearer: >>> [tai + (10, -10)[tai >= 10] for tai in ta] [15, 5, 2, 0, 19] It may have a performance benefit as well, but (a) I haven't tested it to see, and (b) it would be irrelevant for small lists like this anyway. One other thing I should have noted: unlike the ?: operator in C/C++/Java, this construction (and the iif() function in my message) will always evaluate both expressions, and does not short-circuit. In many instances this is not necessary anyway. > So, where might I have found this construct. It is probably somewhere > obvious, but I searched and searched without success. Of course, I've > had only limited success in finding what I wanted in the "official' > docs, though the QR has been quite useful. It's in the "General Programming FAQ": http://www.python.org/doc/faq/programming.html#is-there-an-equivalent-of-c-s-ternary-operator -- http://mail.python.org/mailman/listinfo/python-list
