On Tue, 15 Mar 2005 07:47:20 -0800, Guido van Rossum <[EMAIL PROTECTED]> wrote:
But I'm not so sure now. Thinking ahead to generic types, I'd like the full signature to be:
def sum(seq: sequence[T], initial: T = 0) -> T.
Would this _syntax_ work with generic types:
def sum(seq: sequence[T], initial: T = T()) -> T.
This doesn't make sense with existing semantics because default arguments are evaluated when the function is defined, but T() can't be evaluated until the function is called. I'm not sure there's a way around that problem without turning default arguments into a trap for the unwary.
jw _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
