add_setting

add_setting(path, default_value, description='')

Add a new setting if it does not already exist. The default value is always used to define the default value of the setting, even if it exists, while the description is used only if a new setting is created. The path is a plug path, i.e. a plug name if the plug is in the settings node, or a node path (node names separated by ‘/’) followed by ‘.’ and the plug name. This function returns the setting plug.