class_docstr: Marshmallow validation error for dataset already exists
class_docstr_tok: ["Marshmallow","validation","error","for","dataset","already","exists"]
code: def __init__(self, table_name: str) -> None:
      super().__init__(
          [get_dataset_exist_error_msg(table_name)],
          field_name="table_name",
      )
  
imports: from flask_babel import lazy_gettext
  from marshmallow.validate import ValidationError
  from superset.commands.exceptions import CommandException, CommandInvalidError, CreateFailedError, DeleteFailedError, ForbiddenError, ImportFailedError, UpdateFailedError
label_desc: Use image node_id 1 to create a new DatasetExistsValidationError object from inherited base classes: ValidationError with example: obj = DatasetExistsValidationError(table_name)