On Sat, Sep 1, 2012 at 8:06 PM, Guido van Rossum <guido@python.org> wrote:
It's less Pythonic, because every sequence-like type (not just list)
would have to reimplement it.

Similar things get proposed for iterators (e.g. it1 + it2, it[:n],
it[n:]) regularly and they are (and should be) rejected for the same

Python causes some confusion because some things are methods and others builtins. Is there a PEP or rationale that defines what goes where?

Yuval Greenfield