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

Steven D'Aprano steve at pearwood.info
Thu Mar 1 01:36:15 CET 2012

Raymond Hettinger wrote:

On Feb 29, 2012, at 3:52 PM, Victor Stinner wrote:

I don't know if hardening Python is a compelling argument to add a new builtin type. It isn't. Builtins are for general purpose use. It is not something most people should use; however, if it is a builtin, people will be drawn to frozendicts like moths to a flame. The tuple-as-frozenlist anti-pattern shows what we're up against.

Perhaps I'm a little slow today, but I don't get this. Could you elaborate on tuple-as-frozenlist anti-pattern please?

i.e. what it is, why it is an anti-pattern, and examples of it in real life?

-- Steven

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