fix(python/constants): adjusted python constants to be a true singleton / static class

src/python/const/bindings.cpp

@@ -24,16 +24,31 @@ void register_const_bindings(pybind11::module &const_submodule) {
 
     py::class_<Constants>(const_submodule, "Constants")
         .def_property_readonly("loaded", &Constants::isLoaded)
-        .def("get", &Constants::get, py::arg("name"), "Get a constant by name. Returns None if not found.")
-        .def("__getitem__", &Constants::get, py::arg("name"))
-        .def("has", &Constants::has, py::arg("name"), "Check if a constant exists by name.")
-        .def("keys", &Constants::keys, "Get a list of all constant names.")
-        .def(py::init([]() {
-            return &Constants::getInstance();
-            }),
-            // Tell pybind11 Python doesn't own this memory.
-            py::return_value_policy::reference,
-            "Get the singleton instance of Constants."
+        .def_static("get",
+            [](const std::string &name) {
+                return py::cast(
+                    Constants::getInstance().get(name)
                 );
+            },
+            "Get a constant by name. Returns None if not found."
+        )
+        .def_static("has",
+            [](const std::string &name) {
+                return Constants::getInstance().has(name);
+            },
+            "Check if a constant exists by name.")
+        .def_static("keys",
+            []() {
+                return py::cast(
+                    Constants::getInstance().keys()
+                );
+            },
+            "Get a list of all constant names.")
+        .def_static("__class_getitem__",
+         [](const std::string &name) {
+             return py::cast(
+                 Constants::getInstance().get(name)
+             );
+         });
 
 }