What about a new PyModuleDef_Slot function?


```
static int my_can_create(/*need any arg??, InterpreterState, etc?*/) {
    if (test_global_condition()) {
        return -1; //Don't allow creation
    }
    return 0; //Allow creation
};

static PyModuleDef_Slot signal_slots[] = {
    {Py_mod_exec, my_exec},
    {Py_mod_can_create, my_can_create},
    {0,0}
};

```