{ lib, buildPythonPackage, fetchPypi, isPy36, immutables }: buildPythonPackage rec { pname = "contextvars"; version = "2.4"; disabled = !isPy36; src = fetchPypi { inherit pname version; sha256 = "f38c908aaa59c14335eeea12abea5f443646216c4e29380d7bf34d2018e2c39e"; }; propagatedBuildInputs = [ immutables ]; meta = { description = "A backport of the Python 3.7 contextvars module for Python 3.6"; homepage = "https://github.com/MagicStack/contextvars"; license = with lib.licenses; [ asl20 ]; maintainers = with lib.maintainers; [ catern ]; }; }