[Python-Dev] Add a frozendict builtin type (original) (raw)

R. David Murray rdmurray at bitdance.com
Fri Mar 2 02:50:51 CET 2012

On Thu, 01 Mar 2012 16:50:06 -0800, Guido van Rossum <guido at python.org> wrote:

On Thu, Mar 1, 2012 at 4:39 PM, Victor Stinner <victor.stinner at gmail.com> wrote: > frozendict could be used to implement "read-only" types: it is not possible > to add or remove an attribute or set an attribute value, but attribute value > can be a mutable object. Example of an enum with my typefinal.patch > (attached to issue #14162). [...]

I think you should provide stronger arguments in each case why the data needs to be truly immutable or read-only, rather than just using _a convention or an "advisory" API (like private can be circumvented but clearly indicates intent to the reader).

+1. Except in very limited circumstances (such as a security sandbox) I would much rather have the code I'm interacting with use advisory means rather than preventing me from being a consenting adult. (Having to name mangle by hand when someone has used a __ method is painful enough, thank you...good thing the need to do that doesn't dome up often (mostly only in unit tests)).

--David

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