{ lib
, python
, buildPythonPackage
, fetchPypi
}:

buildPythonPackage rec {
  pname = "tornado";
  version = "6.0.4";

  # We specify the name of the test files to prevent
  # https://github.com/NixOS/nixpkgs/issues/14634
  checkPhase = ''
    ${python.interpreter} -m unittest discover *_test.py
  '';

  src = fetchPypi {
    inherit pname version;
    sha256 = "0fe2d45ba43b00a41cd73f8be321a44936dc1aba233dee979f17a042b83eb6dc";
  };

  __darwinAllowLocalNetworking = true;

  meta = {
    description = "A web framework and asynchronous networking library";
    homepage = "https://www.tornadoweb.org/";
    license = lib.licenses.asl20;
  };
}