code: def set(self, key, value, filepath):
          
          if not filepath:
              raise RuntimeError("Configuration file not given")
  
          if not self.__check_config_key(key):
              raise RuntimeError("%s parameter does not exists or cannot be set" % key)
  
          config = configparser.SafeConfigParser()
  
          if os.path.isfile(filepath):
              config.read(filepath)
  
          section, option = key.split('.')
  
          if section not in config.sections():
              config.add_section(section)
  
          try:
              config.set(section, option, value)
          except TypeError as e:
              raise RuntimeError(str(e))
  
          try:
              with open(filepath, 'w') as f:
                  config.write(f)
          except IOError as e:
              raise RuntimeError(str(e))
  
          return CMD_SUCCESS
docs: Set configuration parameter.
  
          Writes 'value' on 'key' to the configuration file given in
          'filepath'. Configuration parameter in 'key' must follow the schema
          <section>.<option> .
  
          :param key: key to set
          :param value: value to set
          :param filepath: configuration file