code: def with_default_namespace(self, default_namespace):
      return DeployConfig(
          self._location,
          default_namespace,
          self._domain,
          self._base_path,
      )
  
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 5 for calling the DeployConfig obj's underlying member method code with example usage: obj.with_default_namespace(default_namespace) and returns: DeployConfig