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

[Stephen J. Turnbull]

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),
                          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.


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