code: def start(self):
      if self.force or ask_yes_no(
          "Really delete all ipython history? ",
          default="no",
          interrupt="no",
      ):
          HistoryTrim.start(self)
  
file_path: catboost/contrib/python/ipython/py2/IPython/core/historyapp.py
imports: from __future__ import print_function
  import os
  import sqlite3
  from traitlets.config.application import Application
  from IPython.core.application import BaseIPythonApplication
  from traitlets import Bool, Int, Dict
  from IPython.utils.io import ask_yes_no
label_desc: Use image node_id 1 for calling the HistoryClear obj's underlying member method code with example usage: obj.start() without return types