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

Here is a link to pip install-able implementation of @RaymondHettinger's answer: https://github.com/pcattori/icicle

Simply pip install icicle and you can from icicle import FrozenDict!

Update: icicle has been deprecated in favor of maps: https://github.com/pcattori/maps (documentation, PyPI).