docs: def uconf(**kwargs):
      """
          Function to set a default namespace/include.
          It returns a decorator with the namespace/include argument already set.
          Arguments:
              - include: A custom URL list, previously
                         set on the module's urls.py;
              - namespace: the URL's namespace.
      """
      if len(kwargs) != 1:
          # this function must have exactly
          # one specific argument (namespace or include)
          raise TypeError(
              'uconf() takes exactly 1 argument. ({} given)'.format(len(kwargs))
          )
      # gets the argument name
      arg_name = list(kwargs.keys()).pop(0)
      # checks if it has a valid name (it must be 'namespace' or 'include')
      if arg_name not in ['include', 'namespace']:
          # if it's not a valid name, raise a TypeError
          raise TypeError(
              'Invalid argument: {}'.format(arg_name)
          )
      # creates the decorator with namespace/include already set.
      return partial(umap, **kwargs)