code: def __init__(self) -> None:
      self._ssh_manager = None
  
file_path: superset/superset/extensions/ssh.py
imports: import logging
  from io import StringIO
  from typing import TYPE_CHECKING
  import sshtunnel
  from flask import Flask
  from paramiko import RSAKey
  from superset.databases.utils import make_url_safe
  from superset.utils.class_utils import load_class_from_name
label_desc: Use image node_id 1 to create a new SSHManagerFactory object  with example: obj = SSHManagerFactory()