Immutable dictionary, only use as a key for another dictionary

Question

I had the need to implement a hashable dict so I could use a dictionary as a key for another dictionary.

A few months ago I used this implementation: Python hashable

Answer 1

You can use an enum:

import enum

KeyDict1 = enum.Enum('KeyDict1', {'InnerDictKey1':'bla', 'InnerDictKey2 ':2})

d = { KeyDict1: 'whatever', KeyDict2: 1, ...}

You can access the enums like you would a dictionary:

KeyDict1['InnerDictKey2'].value  # This is 2

You can iterate over the names, and get their values... It does everything you'd expect.