code: def set(property_name, value, system=False):
      
      config_filename = \
          _SYSTEM_CONFIG_FILE if system is True else _USER_CONFIG_FILE
      config = _read_config(config_filename)
  
      section = _MAIN_SECTION_NAME
      config.set(section, property_name, value)
      _write_config(config, config_filename)
docs: Sets the configuration property to the specified value.
  
      :param property_name: The name of the property to set.
      :param value: The value for the property.
      :keyword system: Set to True to modify the system configuration file.
                       If not set, the user config file will be modified.