[Python-ideas] namedtuple literals [Was: RE a new namedtuple]

Stephen J. Turnbull turnbull.stephen.fw at u.tsukuba.ac.jp
Tue Jul 25 05:08:18 EDT 2017

C Anthony Risinger writes:

 > At the end of the day, I don't see a way to have both a literal and
 > something that is externally "named", because the only ways to pass the
 > name I can imagine would make it look like a value within the container
 > itself (such as using a literal string for the first item), unless even
 > more new syntax was added.

OK, so I took your "a tuple is a tuple is a tuple" incorrectly.  What
you want (as I understand it now) is not what

    def ntuple0(attr_list):
        return namedtuple("_", attr_list)

gives you, but something like what

    def ntuple1(attr_list)
        return namedtuple("ImplicitNamedtuple_" + "_".join(attr_list),

does.  Then this would truly be a "duck-typed namedtuple" as Chris
Barker proposed in response to Steven d'Aprano elsewhere in this
thread.  See also Nick's full, namedtuple-compatible, implementation.
Of course we still have the horrible "list of strings naming
attributes" argument, so you still want a literal if possible, but
with a **key argument, a new builtin would do the trick for me.  YMMV.

Associate Professor              Division of Policy and Planning Science
http://turnbull/sk.tsukuba.ac.jp/     Faculty of Systems and Information
Email: turnbull at sk.tsukuba.ac.jp                   University of Tsukuba
Tel: 029-853-5175                 Tennodai 1-1-1, Tsukuba 305-8573 JAPAN

More information about the Python-ideas mailing list