python3-immutabledict - 2.2.5-1 main

Immutabledict implements the complete mapping interface and can be
used as a drop-in replacement for dictionaries where immutability is
desired. The immutabledict constructor mimics dict, and all of the
expected interfaces (iter, len, repr, hash, getitem) are provided. Note
that an immutabledict does not guarantee the immutability of its values,
so the utility of hash method is restricted by usage.
.
The only difference is that the copy() method of immutable takes variable
keyword arguments, which will be present as key/value pairs in the new,
immutable copy.