[Python-Dev] iterzip()

[Martin v. Loewis]

Tim Peters <tim.one@comcast.net> writes:

> How do we know which other objects they refer to?  How do we know that the
> set of objects they refer to will never change?  And do we have a reason to
> believe that any type other than tuples makes a lick of difference <wink>?

I'd suggest a tp_is_immutable predicate. If a container is immutable
and non-cyclic, it can be untracked. A container is non-cyclic if all
contained objects are either non-gc, or untracked.

Regards,
Martin