On Mon, Jan 20, 2003 at 04:53:51PM +0100, Martin v. L=F6wis wrote: > It doesn't: You can't create a tuple that contains itself, except on > the C level (which I would declare a bug in the C code that does so). > So any cycle involving a tuple must involve a non-tuple object as > well. But a tuple subclass can. Does the code use PyTuple_Check or PyTuple_CheckExact? Jeff