On Mon, 8 Jul 2002, David Abrahams wrote:
I keep running into the problem that there is no reliable way to introspect about whether a type supports multi-pass iterability (in the sense that an input stream might support only a single pass, but a list supports multiple passes). I suppose you could check for __getitem__, but that wouldn't cover linked lists, for example.
Can anyone channel Guido's intent for me? Is this an oversight or a deliberate design decision? Is there an interface for checking multi-pass-ability that I've missed?
As far as I can tell, there is no published Python mechanism that distinguishes "input iterators" from "forward iterators" (using the C++ parlance).
-- Kevin Jacobs The OPAL Group - Enterprise Systems Architect Voice: (216) 986-0710 x 19 E-mail: email@example.com Fax: (216) 986-0714 WWW: http://www.theopalgroup.com