code: def base_path(self, service):
      if self._base_path is None:
          return ""
      return f"{self._base_path}/{service}"
  
imports: from typing import Dict, Optional, TypeVar, Union
  import os
  import json
  import logging
  from ..utils import first_extant_file
  from .user_config import get_user_config
label_desc: Use image node_id 11 for calling the DeployConfig obj's underlying member method code with example usage: obj.base_path(service) and returns: self, str, service, str