On Tue, Apr 26, 2016, at 12:12, Steven D'Aprano wrote: > The obvious reason for overriding __new__ is to construct an immutable > instance. You have to override __new__, because by the time it returns > the > instance is immutable and you can no longer initialise it.
Other than by subclassing an existing immutable type written in C, is it actually possible to define a truly-immutable (rather than contract-immutable) class in python? (Of course, subclassing immutable C types is the more obvious answer to when you have to override __new__). -- https://mail.python.org/mailman/listinfo/python-list
