pyrsistent: pyrsistent (Persistent/Functional/Immutable data structures) pyrsistent: pyrsistent: Pyrsistent is a number of persistent collections (by some referred to pyrsistent: as functional data structures). Persistent in the sense that they are pyrsistent: immutable. pyrsistent: pyrsistent: https://github.com/tobgu/pyrsistent/ pyrsistent: pyrsistent: pyrsistent: pyrsistent: