Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

For the performance of namedtuple type creation see issue28638 and 
https://mail.python.org/pipermail/python-dev/2017-July/148592.html. For 
difference between types and instance see 
https://docs.python.org/3/tutorial/classes.html.

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<https://bugs.python.org/issue31661>
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