docs: def get_args_and_kwargs(self):
          """Return a list and a dict usable as ``*args, **kwargs`` to pass to a callable."
  
          If the entity is known to not accept arguments (``self.args`` is ``None``), then this
          method returns ``None`` for both args and kwargs.
  
          Returns
          -------
          tuple (list or None, dict or None)
              A tuple with as first value, the list of positioned arguments (or ``None``), and as
              second value the dict of named arguments (or ``None``)
  
          """
  
          args = None
          kwargs = None
  
          if self.args:
              args = []
              kwargs = {}
              for arg in self.args:
                  if arg.is_named:
                      kwargs[arg.arg] = arg.value
                  else:
                      args.append(arg.value)
  
          return args, kwargs