docs: def get_all_keys_starting_with(self, start_key):
          """ Returns all keys, which start with a certain pattern defined in :param start_key.
  
          :param start_key: The start pattern to search all keys for.
          :return:
          """
          start_key = str(start_key)
          output_list = []
          if len(self.__global_variable_dictionary) == 0:
              return output_list
          for g_key in self.__global_variable_dictionary.keys():
              # string comparison
              if g_key and start_key in g_key:
                  output_list.append(g_key)
          return output_list