code: def pt_init(self):
      def get_prompt_tokens(cli):
          return [(Token.Prompt, self.prompt)]
  
      def patch_stdout(**kwargs):
          return self.pt_cli.patch_stdout_context(**kwargs)
  
      if self._ptcomp is None:
          compl = IPCompleter(
              shell=self.shell,
              namespace={},
              global_namespace={},
              use_readline=False,
              parent=self.shell,
          )
          self._ptcomp = IPythonPTCompleter(
              compl, patch_stdout=patch_stdout
          )
  
      kbmanager = KeyBindingManager.for_prompt()
      supports_suspend = Condition(
          lambda cli: hasattr(signal, "SIGTSTP")
      )
      kbmanager.registry.add_binding(
          Keys.ControlZ, filter=supports_suspend
      )(suspend_to_bg)
  
      if self.shell.display_completions == "readlinelike":
          kbmanager.registry.add_binding(
              Keys.ControlI,
              filter=(
                  HasFocus(DEFAULT_BUFFER)
                  & ~HasSelection()
                  & ViInsertMode()
                  | EmacsInsertMode() & ~cursor_in_leading_ws
              ),
          )(display_completions_like_readline)
      multicolumn = self.shell.display_completions == "multicolumn"
  
      self._pt_app = create_prompt_application(
          editing_mode=getattr(
              EditingMode, self.shell.editing_mode.upper()
          ),
          key_bindings_registry=kbmanager.registry,
          history=self.shell.debugger_history,
          completer=self._ptcomp,
          enable_history_search=True,
          mouse_support=self.shell.mouse_support,
          get_prompt_tokens=get_prompt_tokens,
          display_completions_in_columns=multicolumn,
          style=self.shell.style,
      )
      self.pt_cli = CommandLineInterface(
          self._pt_app, eventloop=self.shell._eventloop
      )
  
imports: import signal
  import sys
  from IPython.core.debugger import Pdb
  from IPython.core.completer import IPCompleter
  from .ptutils import IPythonPTCompleter
  from .shortcuts import suspend_to_bg, cursor_in_leading_ws
  from prompt_toolkit.enums import DEFAULT_BUFFER
  from prompt_toolkit.filters import Condition, HasFocus, HasSelection, ViInsertMode, EmacsInsertMode
  from prompt_toolkit.keys import Keys
  from prompt_toolkit.key_binding.manager import KeyBindingManager
  from prompt_toolkit.key_binding.bindings.completion import display_completions_like_readline
  from prompt_toolkit.token import Token
  from prompt_toolkit.shortcuts import create_prompt_application
  from prompt_toolkit.interface import CommandLineInterface
  from prompt_toolkit.enums import EditingMode
label_desc: Use image node_id 2 for calling the TerminalPdb obj's underlying member method code with example usage: obj.pt_init() and returns: list, self