class_docstr: A Jupyter Migration App.
docstr: Start the application.
docstr_tok: ["Start","the","application","."]
code: def start(self) -> None:
      """Start the application."""
      if not migrate():
          self.log.info("Found nothing to migrate.")
  
imports: from __future__ import annotations
  import os
  import re
  import shutil
  from datetime import datetime, timezone
  from pathlib import Path
  from typing import Any
  from traitlets.config.loader import JSONFileConfigLoader, PyFileConfigLoader
  from traitlets.log import get_logger
  from .application import JupyterApp
  from .paths import jupyter_config_dir, jupyter_data_dir
  from .utils import ensure_dir_exists
label_desc: Use image node_id 1 for calling the JupyterMigrate obj's underlying member method code with example usage: obj.start() without return types