[issue29357] New NamedTuple syntax silently ignores method definitions

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

This has been already reported in https://github.com/python/typing/issues/352 and fixed in https://hg.python.org/cpython/rev/f100619e7137 and https://github.com/python/typing/pull/364

Now adding new methods works but overwriting existing special attributes raises AttributeError:

class A(NamedTuple):
    x: int
    def spam(self):  # this works
        ...
    def _fields(self):  # this is an error (and also for __repr__ etc)

If you think that overwriting all special attributes should be allowed (or only some of them) then we could discuss this at python/typing tracker.

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nosy: +levkivskyi
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29357>
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