diff --git a/pkgs/development/python-modules/deal/default.nix b/pkgs/development/python-modules/deal/default.nix
new file mode 100644
index 000000000000..5f887848453b
--- /dev/null
+++ b/pkgs/development/python-modules/deal/default.nix
@@ -0,0 +1,100 @@
+{ lib
+, buildPythonPackage
+, pythonOlder
+, fetchFromGitHub
+, flit-core
+, astroid
+, pytestCheckHook
+, docstring-parser
+, isort
+, marshmallow
+, pytest-cov
+, sphinx
+, hypothesis
+, vaa
+, deal-solver
+, pygments
+, typeguard
+, coverage
+, urllib3
+}:
+
+buildPythonPackage rec {
+  pname = "deal";
+  version = "4.23.3";
+  format = "pyproject";
+  disabled = pythonOlder "3.7";
+
+  src = fetchFromGitHub {
+    owner = "life4";
+    repo = pname;
+    rev = "refs/tags/${version}";
+    hash = "sha256-duFxe2KSQQb7HB5KrrE32xzTb6QkQcrQssiuXLKao50=";
+  };
+
+  postPatch = ''
+    # don't do coverage
+    substituteInPlace pyproject.toml \
+      --replace "\"--cov-fail-under=100\"," "" \
+      --replace "\"--cov=deal\"," "" \
+      --replace "\"--cov-report=html\"," "" \
+      --replace "\"--cov-report=term-missing:skip-covered\"," ""
+  '';
+
+  nativeBuildInputs = [
+    flit-core
+  ];
+
+  propagatedBuildInputs = [
+    astroid
+    deal-solver
+    pygments
+    typeguard
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+
+    docstring-parser
+    marshmallow
+    sphinx
+    hypothesis
+    vaa
+    urllib3
+  ];
+
+  disabledTests = [
+    # needs internet access
+    "test_smoke_has"
+    "test_pure_offline"
+    "test_raises_doesnt_override_another_contract"
+    "test_raises_doesnt_override_another_contract_async"
+    "test_raises_generator"
+    # AttributeError: module 'vaa' has no attribute 'Error'
+    "test_source_vaa_scheme"
+    "test_vaa_scheme_and_custom_exception"
+    "test_scheme_string_validation_args_correct"
+    "test_method_chain_decorator_with_scheme_is_fulfilled"
+    "test_scheme_contract_is_satisfied_when_setting_arg"
+    "test_scheme_contract_is_satisfied_within_chain"
+    "test_scheme_errors_rewrite_message"
+  ];
+
+  disabledTestPaths = [
+    # needs internet access
+    "tests/test_runtime/test_offline.py"
+  ];
+
+  pythonImportsCheck = [ "deal" ];
+
+  meta = with lib; {
+    description = "Library for design by contract (DbC) and checking values, exceptions, and side-effects";
+    longDescription = ''
+      In a nutshell, deal empowers you to write bug-free code.
+      By adding a few decorators to your code, you get for free tests, static analysis, formal verification, and much more
+    '';
+    homepage = "https://github.com/life4/deal";
+    license = licenses.mit;
+    maintainers = with maintainers; [ gador ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index c9df58326c92..011493227b1b 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -2129,6 +2129,8 @@ in {
 
   ddt = callPackage ../development/python-modules/ddt { };
 
+  deal = callPackage ../development/python-modules/deal { };
+
   deal-solver = callPackage ../development/python-modules/deal-solver { };
 
   deap = callPackage ../development/python-modules/deap { };