code: def set(config, section, opt, value):
          
          if section not in config.keys():
              config[section] = {}
  
          config[section][opt] = value
docs: Sets specified option in the config.
  
          Args:
              config (configobj.ConfigObj): config to work on.
              section (str): section name.
              opt (str): option name.
              value: value to set option to.