class_docstr: Adaptor to provide IPython completions to prompt_toolkit
code: def ipy_completer(self):
      if self._ipy_completer:
          return self._ipy_completer
      else:
          return self.shell.Completer
  
imports: import unicodedata
  from wcwidth import wcwidth
  from IPython.core.completer import provisionalcompleter, cursor_to_position, _deduplicate_completions
  from prompt_toolkit.completion import Completer, Completion
  from prompt_toolkit.lexers import Lexer
  from prompt_toolkit.lexers import PygmentsLexer
  from prompt_toolkit.patch_stdout import patch_stdout
  import pygments.lexers
  import os
  import sys
  import traceback
label_desc: Use image node_id 2 for calling the IPythonPTCompleter obj's underlying member method code with example usage: obj.ipy_completer() and returns: self, self