Py-immutables

Jul 20, 2023

Immutable collections

An immutable mapping type for Python.

The underlying datastructure is a Hash Array Mapped Trie HAMT used in Clojure, Scala, Haskell, and other functional languages. This implementation is used in CPython 3.7 in the contextvars module see PEP 550 and PEP 567 for more details.

Immutable mappings based on HAMT have Olog N performance for both set and get operations, which is essentially O1 for relatively small mappings.



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