Serhiy Storchaka added the comment:

Indeed, keys of __dict__ are interned. But elements of _fields are not.

>>> A = namedtuple('A', 'abc123 def456')
>>> sorted(A.__dict__)[-1] == A._fields[-1]
True
>>> sorted(A.__dict__)[-1] is A._fields[-1]
False

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25981>
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