code: def yank_last_arg(event):
      """
      Like `yank_nth_arg`, but if no argument has been given, yank the last word
      of each line.
      """
      n = event.arg if event.arg_present else None
      event.current_buffer.yank_last_arg(n)
  
imports: from __future__ import unicode_literals
  from prompt_toolkit.enums import IncrementalSearchDirection, SEARCH_BUFFER
  from prompt_toolkit.selection import PasteMode
  from six.moves import range
  import six
  from .completion import generate_completions, display_completions_like_readline
  from prompt_toolkit.document import Document
  from prompt_toolkit.enums import EditingMode
  from prompt_toolkit.key_binding.input_processor import KeyPress
  from prompt_toolkit.keys import Keys
label_desc: Use image node_id 34 for calling a global function with example usage: yank_last_arg(event) without return types