docs: def load_class(self, classname):
          """
          Loads a class looking for it in each module registered.
  
          :param classname: Class name you want to load.
          :type classname: str
          :return: Class object
          :rtype: type
          """
  
          module_list = self._get_module_list()
  
          for module in module_list:
              try:
                  return import_class(classname, module.__name__)
              except (AttributeError, ImportError):
                  pass
  
          raise ImportError("Class '{0}' could not be loaded.".format(classname))