Why does Python not support record type? (i.e. mutable namedtuple)

Question

Why does Python not support a record type natively? It\'s a matter of having a mutable version of namedtuple.

I could use namedtuple._replace. But I nee

Answer 1

In the closely related Existence of mutable named tuple in Python? question 13 tests are used for comparing 6 mutable alternatives to namedtuple.

The latest namedlist 1.7 passes all of these tests with both Python 2.7 and Python 3.5 as of Jan 11, 2016. It is a pure python implementation.

The second best candidate according to these tests is the recordclass which is a C extension. Of course, it depends on your requirements whether a C extension is preferred or not.

For further details, especially for the tests, see Existence of mutable named tuple in Python?