code: def deep_insert(path_list, value, config):
      
      if len(path_list) > 1:
          inside_config = config.setdefault(path_list[0], {})
          deep_insert(path_list[1:], value, inside_config)
      else:
          config[path_list[0]] = value
docs: Inserts value into config by path, generating intermediate dictionaries.
  
      Example:
          >>> deep_insert(path.split("."), value, {})