python2.pkgs: move expressions into python2-modules/ folder

Another step in further separating python2 from python3.

pkgs/development/python2-modules/pycairo/default.nix

@@ -0,0 +1,52 @@
+{ lib
+, fetchFromGitHub
+, meson
+, ninja
+, buildPythonPackage
+, pytestCheckHook
+, pkg-config
+, cairo
+, python
+}:
+
+buildPythonPackage rec {
+  pname = "pycairo";
+  version = "1.18.2";
+
+  format = "other";
+
+  src = fetchFromGitHub {
+    owner = "pygobject";
+    repo = "pycairo";
+    rev = "v${version}";
+    sha256 = "142145a2whvlk92jijrbf3i2bqrzmspwpysj0bfypw0krzi0aa6j";
+  };
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    pkg-config
+  ];
+
+  buildInputs = [
+    cairo
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  mesonFlags = [
+    # This is only used for figuring out what version of Python is in
+    # use, and related stuff like figuring out what the install prefix
+    # should be, but it does need to be able to execute Python code.
+    "-Dpython=${python.pythonForBuild.interpreter}"
+  ];
+
+  meta = with lib; {
+    description = "Python 2 bindings for cairo";
+    homepage = "https://pycairo.readthedocs.io/";
+    license = with licenses; [ lgpl21Only mpl11 ];
+    platforms = lib.platforms.linux ++ lib.platforms.darwin;
+  };
+}