code: def test_mixed_types(self):
      verify_inference([AnySequence, AnyValue], NoneType)
      verify_inference([AnySequence, AnyValue, AnySequence], NoneType)
      verify_inference([AnySequence, AnyValue, AnyValue], NoneType)
      verify_inference([DatetimeValue, StringValue], NoneType)
      verify_inference([DatetimeValue, IntegerValue], NoneType)
      verify_inference([DatetimeValue, FloatValue], NoneType)
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import numpy
  from numpy import nan
  import array
  import datetime
  from ..data_structures import image
  from ..None import SArray
  import os
  from .._cython.cy_flexible_type import _translate_through_flexible_type
  from .._cython.cy_flexible_type import _translate_through_flex_list
  from .._cython.cy_flexible_type import infer_type_of_list
  from .._cython.cy_flexible_type import _get_inferred_column_type, _all_convertable
  from .._cython.cy_flexible_type import _check_ft_pyobject_hint_path
  from .._cython.cy_flexible_type import pytype_from_type_name
  from .._cython.cy_flexible_type import GMT
  import datetime
  from itertools import product
  from copy import copy
  import pytest
  import sys
label_desc: Use image node_id 4 for calling the FlexibleTypeInference obj's underlying member method code with example usage: obj.test_mixed_types() without return types