How to make an immutable object in Python?

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Yet another solution I just thought of: The simplest way to get the same behaviour as your original code is

Immutable = collections.namedtuple("Immutable", ["a", "b"])

It does not solve the problem that attributes can be accessed via [0] etc., but at least it’s considerably shorter and provides the additional advantage of being compatible with pickle and copy.

namedtuple creates a type similar to what I described in this answer, i.e. derived from tuple and using __slots__. It is available in Python 2.6 or above.

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