1 files changed, 24 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/python-modules/mypy/extensions.nix b/nixpkgs/pkgs/development/python-modules/mypy/extensions.nix
new file mode 100644
index 000000000000..5992a6815d8e
--- /dev/null
+++ b/nixpkgs/pkgs/development/python-modules/mypy/extensions.nix
@@ -0,0 +1,24 @@
+{ lib, fetchPypi, buildPythonPackage, typing, pythonOlder }:
+
+buildPythonPackage rec {
+  pname = "mypy-extensions";
+  version = "0.4.3";
+
+  # Tests not included in pip package.
+  doCheck = false;
+
+  src = fetchPypi {
+    inherit version;
+    pname = "mypy_extensions";
+    sha256 = "2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8";
+  };
+
+  propagatedBuildInputs = if pythonOlder "3.5" then [ typing ] else [ ];
+
+  meta = with lib; {
+    description = "Experimental type system extensions for programs checked with the mypy typechecker";
+    homepage    = "http://www.mypy-lang.org";
+    license     = licenses.mit;
+    maintainers = with maintainers; [ martingms lnl7 ];
+  };
+}