Raymond Hettinger added the comment: Named tuples are not a type, they are a protocol. Guido has agreed that checking for _fields is an acceptable and preferred way of finding out whether something is a namedtuple. I can add a check to at least check the value of _fields is an iterable of strings. If it still aliases with some random use of _fields, the only consequence is that the matching field names will appear in a different order.
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