docs: def _import_all_troposphere_modules(self):
          """ Imports all troposphere modules and returns them """
          dirname = os.path.join(os.path.dirname(__file__))
          module_names = [
              pkg_name
              for importer, pkg_name, is_pkg in
              pkgutil.walk_packages([dirname], prefix="troposphere.")
              if not is_pkg and pkg_name not in self.EXCLUDE_MODULES]
          module_names.append('troposphere')
  
          modules = []
          for name in module_names:
              modules.append(importlib.import_module(name))
  
          def members_predicate(m):
              return inspect.isclass(m) and not inspect.isbuiltin(m)
  
          members = []
          for module in modules:
              members.extend((m[1] for m in inspect.getmembers(
                  module, members_predicate)))
  
          return set(members)