Eric Snow added the comment: It may not enough, but the use of namedtuples (vs. plain tuples) with functools.singledispatch() would be messier without a NamedTuple ABC (or other base type). Of course, when would you want to dispatch specifically on namedtuple? I can think of a few relatively weak uses, but not enough to justify the cost of establishing a common base class for namedtuple.
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