docstr: test if all distributed serializers are lazy loading and can be imported
docstr_tok: ["test","if","all","distributed","serializers","are","lazy","loading","and","can","be","imported"]
code: def test_serializers_importable_and_str(self):
      """test if all distributed serializers are lazy loading and can be imported"""
      import airflow.serialization.serializers
  
      for _, name, _ in iter_namespace(
          airflow.serialization.serializers
      ):
          mod = import_module(name)
          for s in getattr(mod, "serializers", list()):
              if not isinstance(s, str):
                  raise TypeError(
                      f"{s} is not of type str. This is required for lazy loading"
                  )
              try:
                  import_string(s)
              except ImportError:
                  raise AttributeError(
                      f"{s} cannot be imported (located in {name})"
                  )
  
imports: from __future__ import annotations
  import datetime
  import enum
  from dataclasses import dataclass
  from importlib import import_module
  from typing import ClassVar
  import attr
  import pytest
  from pydantic import BaseModel
  from airflow.datasets import Dataset
  from airflow.serialization.serde import CLASSNAME, DATA, SCHEMA_ID, VERSION, _get_patterns, _match, deserialize, serialize
  from airflow.utils.module_loading import import_string, iter_namespace, qualname
  from tests.test_utils.config import conf_vars
label_desc: Use image node_id 17 for calling the TestSerDe obj's underlying member method code with example usage: obj.test_serializers_importable_and_str() without return types